ADuCM360_361

ADuCM360_361
Low Power, Precision Analog Microcontroller
with Dual Sigma-Delta ADCs, ARM Cortex-M3
ADuCM360/ADuCM361
Data Sheet
FEATURES
Analog input/output
Dual 24-bit ADCs (ADuCM360)
Single 24-bit ADC (ADuCM361)
Programmable ADC output rate (3.5 Hz to 3.906 kHz)
Simultaneous 50 Hz/60 Hz noise rejection
At 50 SPS continuous conversion mode
At 16.67 SPS single conversion mode
Flexible input mux for input channel selection to both ADCs
Two 24-bit multichannel ADCs (ADC0 and ADC1)
6 differential or 11 single-ended input channels
4 internal channels for monitoring DAC, temperature
sensor, IOVDD/4, and AVDD/4 (ADC1 only)
Programmable gain (1 to 128)
RMS noise: 52 nV at 3.53 Hz, 200 nV at 50 Hz
Programmable sensor excitation current sources
On-chip precision voltage reference
Single 12-bit voltage output DAC
NPN mode for 4 mA to 20 mA loop applications
Microcontroller
ARM Cortex-M3 32-bit processor
Serial wire download and debug
Internal watch crystal for wake-up timer
16 MHz oscillator with 8-way programmable divider
Memory
128 kB Flash/EE memory, 8 kB SRAM
In-circuit debug/download via serial wire and UART
Rev. B
Power supply range: 1.8 V to 3.6 V (maximum)
Power consumption, MCU active mode
Core consumes 290 µA/MHz
Overall system current consumption of 1.0 mA with core
operating at 500 kHz (both ADCs on, input buffers off,
PGA gain of 4, one SPI port on, and all timers on)
Power consumption, power-down mode: 4 µA (wake-up
timer active)
On-chip peripherals
UART, I2C, and 2 × SPI serial I/O
16-bit PWM controller
19-pin multifunction GPIO port
2 general-purpose timers
Wake-up timer/watchdog timer
Multichannel DMA and interrupt controller
Package and temperature range
48-lead, 7 mm × 7 mm LFCSP
Specified for −40°C to +125°C operation
Development tools
Low cost QuickStart Development System
Third-party compiler and emulator tool support
Multiple functional safety features for improved diagnostics
APPLICATIONS
Industrial automation and process control
Intelligent precision sensing systems
4 mA to 20 mA loop-powered smart sensor systems
Medical devices, patient monitoring
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ADuCM360/ADuCM361
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
SPI Timing Specifications ......................................................... 15
Applications ....................................................................................... 1
Absolute Maximum Ratings ......................................................... 17
Revision History ............................................................................... 2
Thermal Resistance .................................................................... 17
General Description ......................................................................... 3
ESD Caution................................................................................ 17
Functional Block Diagrams ............................................................. 4
Pin Configuration and Function Descriptions........................... 18
Specifications..................................................................................... 6
Typical Performance Characteristics ........................................... 21
Microcontroller Electrical Specifications .................................. 6
Typical System Configuration ...................................................... 22
RMS Noise Resolution of ADC0 and ADC1 .......................... 10
Outline Dimensions ....................................................................... 23
I C Timing Specifications .......................................................... 14
Ordering Guide .......................................................................... 23
2
REVISION HISTORY
7/13—Rev. A to Rev. B
Changes to Features Section and General Description Section....... 3
Changes to Figure 1 .......................................................................... 4
Added Figure 2, Renumbered Sequentially .................................. 5
Changes to Table 1 ............................................................................ 6
Changes to Table 2 and Table 3 ..................................................... 10
Changes to Table 4 and Table 5 ..................................................... 11
Changes to Table 6 and Table 7 ..................................................... 12
Changes to Table 8 and Table 9 ..................................................... 13
Changes to Table 16 ........................................................................ 17
Changes to Figure 14 ...................................................................... 21
11/12—Rev. 0 to Rev. A
Changes to Pin 35 and Pin 36 in Table 16 ................................... 18
9/12—Revision 0: Initial Version
Rev. B | Page 2 of 24
Data Sheet
ADuCM360/ADuCM361
GENERAL DESCRIPTION
The ADuCM360 is a fully integrated, 3.9 kSPS, 24-bit data
acquisition system that incorporates dual high performance,
multichannel sigma-delta (Σ-Δ) analog-to-digital converters
(ADCs), a 32-bit ARM Cortex™-M3 processor, and Flash/EE
memory on a single chip. The ADuCM360 is designed for
direct interfacing to external precision sensors in both wired
and battery-powered applications. The ADuCM361 contains
all the features of the ADuCM360 except that only one 24-bit
Σ-Δ ADC (ADC1) is available.
The ADuCM360/ADuCM361 contain an on-chip 32 kHz
oscillator and an internal 16 MHz high frequency oscillator. The
high frequency oscillator is routed through a programmable clock
divider from which the operating frequency of the processor core
clock is generated. The maximum core clock speed is 16 MHz;
this speed is not limited by operating voltage or temperature.
The microcontroller core is a low power ARM Cortex-M3
processor, a 32-bit RISC machine that offers up to 20 MIPS peak
performance. The Cortex-M3 processor incorporates a flexible,
11-channel DMA controller that supports all wired communication peripherals (SPI, UART, and I2C). Also integrated on chip
are 128 kB of nonvolatile Flash/EE memory and 8 kB of SRAM.
The analog subsystem consists of dual ADCs, each connected to
a flexible input mux. Both ADCs can operate in fully differential
and single-ended modes. Other on-chip ADC features include
dual programmable excitation current sources, diagnostic current
sources, and a bias voltage generator of AVDD_REG/2 (900 mV)
to set the common-mode voltage of an input channel. A low-side
internal ground switch is provided to allow power-down of an
external circuit (for example, a bridge circuit) between conversions.
The ADCs contain two parallel filters: a sinc3 or sinc4 filter in
parallel with a sinc2 filter. The sinc3 or sinc4 filter is used for
precision measurements. The sinc2 filter is used for fast measurements and for the detection of step changes in the input signal.
The ADuCM360/ADuCM361 integrate a range of on-chip
peripherals, which can be configured under microcontroller
software control as required in the application. The peripherals
include UART, I2C, and dual SPI serial I/O communication
controllers; a 19-pin GPIO port; two general-purpose timers;
a wake-up timer; and a system watchdog timer. A 16-bit PWM
controller with six output channels is also provided.
The ADuCM360/ADuCM361 are specifically designed to operate
in battery-powered applications where low power operation is
critical. The microcontroller core can be configured in a normal
operating mode that consumes 290 μA/MHz (including flash/
SRAM IDD). An overall system current consumption of 1 mA
can be achieved with both ADCs on (input buffers off), PGA
gain of 4, one SPI port on, and all timers on.
The ADuCM360/ADuCM361 can be configured in a number
of low power operating modes under direct program control,
including a hibernate mode (internal wake-up timer active) that
consumes only 4 µA. In hibernate mode, peripherals such as
external interrupts or the internal wake-up timer can wake up the
device. This mode allows the part to operate with ultralow power
and still respond to asynchronous external or periodic events.
On-chip factory firmware supports in-circuit serial download
via a serial wire interface (2-pin JTAG system) and UART; nonintrusive emulation is also supported via the serial wire interface.
These features are incorporated into a low cost QuickStart™
Development System that supports this precision analog microcontroller family.
The parts operate from an external 1.8 V to 3.6 V voltage supply
and are specified over an industrial temperature range of −40°C
to +125°C.
More information on the ADuCM360/ADuCM361, see the
UG-367 user guide.
The devices contain a low noise, low drift internal band gap reference, but they can be configured to accept one or two external
reference sources in ratiometric measurement configurations. An
option to buffer the external reference inputs is provided on chip.
A single-channel buffered voltage output DAC is also provided
on chip.
Rev. B | Page 3 of 24
ADuCM360/ADuCM361
Data Sheet
FUNCTIONAL BLOCK DIAGRAMS
ON-CHIP
1.8V ANALOG
LDO
12-BIT
DAC
BUFFER
AMP
BUF
MOD2
GAIN
VREF
24-BIT
Σ-∆ ADC
ARM
CORTEX-M3
PROCESSOR
Σ-∆
MODULATOR
SINC3/4
FILTER
16MHz
AIN6/IEXC
AIN8/EXTREF2IN–
AIN9/DACBUFF+
AIN10
AIN11/VBIAS1
SINC2
FILTER
MUX
VREF
AMP
BUF
MOD2
GAIN
RESET
ON-CHIP
OSCILLATOR
(1% TYP)
16MHz
XTALO
24-BIT
Σ-∆ ADC
Σ-∆
MODULATOR
SINC3/4
FILTER
XTALI
GPIO PORTS
UART PORTS
2 × SPI PORTS
I2C PORTS
MEMORY
128kB FLASH
8kB SRAM
TIMER0
TIMER1
WATCHDOG
WAKE-UP TIMER
PWM
DMA AND
INTERRUPT
CONTROLLER
SERIAL WIRE
DEBUG,
PROGRAMMING
AND DEBUG
SELECTABLE
VREF
SOURCES
DAC, TEMP,
IOVDD/4,
AVDD/4
19 GENERALPURPOSE
I/O PORTS
SWDIO
SWCLK
PRECISION
REFERENCE
IREF
POWER-ON
RESET
VBIAS
GENERATOR
AIN0
AIN1
AIN2
AIN3
AIN4/IEXC
AIN5/IEXC
AIN7/VBIAS0/IEXC/
EXTREF2IN+
ON-CHIP
1.8V DIGITAL
LDO
ADuCM360
DVDD_REG
BUFFER
CURRENT
SOURCES
AVDD_REG
BUFFER
GND_SW
VREF– VREF+
INT_REF
Figure 1. ADuCM360 Functional Block Diagram
Rev. B | Page 4 of 24
IOVDD
IOVDD
09743-001
DAC
AVDD
AGND
Data Sheet
ON-CHIP
1.8V ANALOG
LDO
12-BIT
DAC
BUFFER
ARM
CORTEX-M3
PROCESSOR
16MHz
AIN6/IEXC
AIN8/EXTREF2IN–
AIN9/DACBUFF+
AIN10
AIN11/VBIAS1
SINC2
FILTER
MUX
VREF
AMP
BUF
MOD2
GAIN
RESET
ON-CHIP
OSCILLATOR
(1% TYP)
16MHz
XTALO
24-BIT
Σ-∆ ADC
Σ-∆
MODULATOR
SINC3/4
FILTER
XTALI
GPIO PORTS
UART PORTS
2 × SPI PORTS
I2C PORTS
MEMORY
128kB FLASH
8kB SRAM
TIMER0
TIMER1
WATCHDOG
WAKE-UP TIMER
PWM
DMA AND
INTERRUPT
CONTROLLER
SERIAL WIRE
DEBUG,
PROGRAMMING
AND DEBUG
SELECTABLE
VREF
SOURCES
DAC, TEMP,
IOVDD/4,
AVDD/4
19 GENERALPURPOSE
I/O PORTS
SWDIO
SWCLK
PRECISION
REFERENCE
IREF
POWER-ON
RESET
VBIAS
GENERATOR
AIN0
AIN1
AIN2
AIN3
AIN4/IEXC
AIN5/IEXC
AIN7/VBIAS0/IEXC/
EXTREF2IN+
ON-CHIP
1.8V DIGITAL
LDO
ADuCM361
DVDD_REG
BUFFER
CURRENT
SOURCES
AVDD_REG
BUFFER
GND_SW
VREF– VREF+
INT_REF
Figure 2. ADuCM361 Functional Block Diagram
Rev. B | Page 5 of 24
IOVDD
IOVDD
09743-014
DAC
AVDD
AGND
ADuCM360/ADuCM361
ADuCM360/ADuCM361
Data Sheet
SPECIFICATIONS
MICROCONTROLLER ELECTRICAL SPECIFICATIONS
AVDD/IOVDD = 1.8 V to 3.6 V, internal 1.2 V reference, fCORE = 16 MHz, all specifications at TA = −40°C to +125°C, unless otherwise noted.
Table 1.
Parameter
ADC SPECIFICATIONS
Conversion Rate 1
No Missing Codes1
RMS Noise and Data Output Rates
Integral Nonlinearity1
Offset Error 2, 3, 4, 6, 7
Offset Error Drift vs. Temperature1, 4, 6
Offset Error Lifetime Stability 5
Full-Scale Error1, 4, 6, 7, 8
Full-Scale Error Lifetime Stability5
Gain Error Drift vs. Temperature1, 4, 6
PGA Gain Mismatch Error
Power Supply Rejection1
Absolute Input Voltage Range
Unbuffered Mode
Buffered Mode
Differential Input Voltage Ranges1
Common-Mode Voltage, VCM1
Input Current 9
Buffered Mode
Unbuffered Mode
Test Conditions/Comments
ADC0 and ADC1
Chop off
Chop on
Chop off, fADC ≤ 500 Hz
Chop on, fADC ≤ 250 Hz
See Table 2 through Table 9
Gain = 1, input buffer off
Gain = 2, 4, 8, or 16
Gain = 32, 64, or 128
Chop off; offset error is in the order of
the noise for the programmed gain and
update rate following calibration
Chop on1
Chop off, gain ≤ 4
Chop off, gain ≥ 8
Chop on
Gain = 128
Min
3.5
3.5
24
24
Gain = 128
External reference
Gain = 1, 2, 4, 8, or 16
Gain = 32, 64, or 128
External reference
Chop on, ADC input = 0.25 V, gain = 4
Chop off, ADC input = 7.8 mV, gain = 128
Chop off, ADC input = 1 V, gain = 1
Gain = 1 is not available; see the information about silicon anomalies on the
ADuCM360/ADuCM361 product page
Gain ≥ 2
For gain = 32, 64, and 128, see Table 3
and Table 7 for allowable input ranges
and noise values
Gain = 1
Gain = 2
Gain = 4
Gain = 8
Gain = 16
Ideally, VCM = ((AIN+) + (AIN−))/2; gain =
2 to 128; input current varies with VCM
(see Figure 9 and Figure 10)
Gain > 1 (excluding AIN4, AIN5, AIN6,
and AIN7 pins)
Gain > 1 (AIN4, AIN5, AIN6, and AIN7 pins)
Input current varies with input voltage
Rev. B | Page 6 of 24
Typ
Max
Unit
3906
1302
Hz
Hz
Bits
Bits
±10
±15
±20
±100/gain
ppm of FSR
ppm of FSR
ppm of FSR
μV
±1.0
1/gain
230
10
1
±0.5/gain
70
μV
μV/°C
nV/°C
nV/°C
μV/1000Hr
mV
μV/1000Hr
±3
±6
±0.15
ppm/°C
ppm/°C
%
95
80
90
dB
dB
dB
AGND
AVDD
V
AGND + 0.1
AVDD − 0.1
V
AGND
±VREF
±500
±250
±125
±62.5
AVDD
V
mV
mV
mV
mV
V
1
nA
2
500
nA
nA/V
Data Sheet
Parameter
Average Input Current Drift1
Buffered Mode
Unbuffered Mode
Common-Mode Rejection, DC1
Common-Mode Rejection,
50 Hz/60 Hz1
Normal-Mode Rejection, 50 Hz/60 Hz1
TEMPERATURE SENSOR1
Voltage Output at 25°C
Voltage Temperature Coefficient (TC)
Accuracy
GROUND SWITCH
RON
Allowable Current1
VOLTAGE REFERENCE
Internal VREF
Initial Accuracy
Reference Temperature Coefficient
(TC)1, 10
Power Supply Rejection1
EXTERNAL REFERENCE INPUTS
Input Range
Buffered Mode
Unbuffered Mode
Input Current
Buffered Mode
Unbuffered Mode
Normal-Mode Rejection1
Common-Mode Rejection1
Reference Detect Levels1
EXCITATION CURRENT SOURCES
Output Current
Initial Tolerance at 25°C1
Drift1
Initial Current Matching at 25°C1
Drift Matching1
Load Regulation, AVDD1
Output Compliance1
ADuCM360/ADuCM361
Test Conditions/Comments
Min
AIN0, AIN1, AIN2, AIN3
AIN4, AIN5, AIN6, AIN7
AIN8, AIN9, AIN10, AIN11
On ADC input
ADC gain = 1, AVDD < 2 V
ADC gain = 1, AVDD > 2 V
ADC gain = 2 to 128
50 Hz/60 Hz ± 1 Hz; fADC = 16.7 Hz,
chop on; fADC = 50 Hz, chop off
ADC gain = 1
ADC gain = 2 to 128
On ADC input
50 Hz/60 Hz ± 1 Hz; fADC = 16.7 Hz,
chop on; fADC = 50 Hz, chop off
After user calibration
Processor powered down or in standby
mode before measurement
65
80
80
Typ
Max
±5
±16
±9
±250
pA/°C
pA/°C
pA/°C
pA/V/°C
100
100
dB
dB
dB
97
90
60
3.7
dB
dB
80
dB
82.1
mV
250
6
µV/°C
°C
10
20 kΩ resistor off, direct short to ground
ADC internal reference
19
20
Ω
mA
+0.1
+15
V
%
ppm/°C
1.2
Measured at TA = 25°C
Minimum differential voltage between
VREF+ and VREF− pins is 400 mV
−0.1
−15
±5
82
90
AGND + 0.1
0
−20
85
Available from each current source; value
programmable from 10 µA to 1 mA
IOUT ≥ 50 µA
Using internal reference resistor
Using external 150 kΩ reference resistor
between IREF pin and AGND; resistor
must have drift specification of 5 ppm/°C
Matching between both current sources
AVDD = 3.3 V
IOUT = 10 µA to 210 µA
IOUT > 210 µA
Rev. B | Page 7 of 24
10
dB
AVDD − 0.1
AVDD
V
V
+10
500
80
100
400
+27
nA
nA/V
dB
dB
mV
50
1000
μA
±5
100
75
400
400
%
ppm/°C
ppm/°C
AVDD − 0.85
AVDD − 1.1
%
ppm/°C
%/V
V
V
±0.5
50
0.2
AGND − 0.03
AGND − 0.03
Unit
ADuCM360/ADuCM361
Parameter
DAC CHANNEL SPECIFICATIONS
Voltage Range
DC Specifications 11
Resolution
Relative Accuracy
Differential Nonlinearity
Offset Error
Gain Error
NPN Mode1
Resolution
Relative Accuracy
Differential Nonlinearity
Offset Error
Gain Error
Output Current Range
Interpolation Mode1
Resolution
Relative Accuracy
Differential Nonlinearity
Offset Error
Gain Error
DAC AC CHARACTERISTICS1
Voltage Output Settling Time
Digital-to-Analog Glitch Energy
POWER-ON RESET (POR)
POR Trip Level
Timeout from POR1
WATCHDOG TIMER (WDT)1
Timeout Period
Timeout Step Size
FLASH/EE MEMORY1
Endurance 12
Data Retention 13
DIGITAL INPUTS
Input Leakage Current
Logic 1
Logic 0
Input Leakage Current
Logic 1
Logic 0
Input Capacitance1
Logic Inputs
Input Low Voltage, VINL
Input High Voltage, VINH
Data Sheet
Test Conditions/Comments
RL = 5 kΩ, CL = 100 pF
Internal reference
External reference
Min
Typ
0
0
Max
Unit
VREF
1.8
V
V
±1
±10
±0.5
Bits
LSB
LSB
mV
%
23.6
Bits
LSB
LSB
mA
mA
mA
12
±3
±0.5
±2
Guaranteed monotonic
1.2 V internal reference
VREF range (reference = 1.2 V)
12
±3
±0.5
±0.35
±0.75
0.008
Only monotonic to 14 bits
For 14-bit resolution
Monotonic (14 bits)
1.2 V internal reference
VREF range (reference = 1.2 V)
AVDD range
1 LSB change at major carry (maximum
number of bits changes simultaneously
in the DAC0DAT register)
Voltage at DVDD pin
Power-on level
Power-down level
14
±4
±0.5
±2
±1
±1
Bits
LSB
LSB
mV
%
%
10
±20
µs
nV-sec
1.6
1.6
50
V
V
ms
0.00003
T3CON[3:2] = 10
8192
7.8125
TJ = 85°C
All digital inputs
Digital inputs except for the RESET,
SWCLK, and SWDIO pins
VINH = IOVDD or VINH = 1.8 V
Internal pull-up disabled
VINL = 0 V
Internal pull-up disabled
RESET, SWCLK, and SWDIO pins
10,000
10
Cycles
Years
140
1
160
10
μA
nA
μA
nA
140
160
10
μA
μA
pF
0.2 × IOVDD
0.7 × IOVDD
Rev. B | Page 8 of 24
sec
ms
V
V
Data Sheet
Parameter
Logic Outputs
Output High Voltage, VOH
Output Low Voltage, VOL
CRYSTAL OSCILLATOR1
Logic Inputs, XTALI Only 14
Input Low Voltage, VINL
Input High Voltage, VINH
XTALI Capacitance
XTALO Capacitance
ON-CHIP LOW POWER OSCILLATOR
Oscillator Frequency
Accuracy
ON-CHIP HIGH FREQUENCY OSCILLATOR
Oscillator Frequency
Accuracy
Long Term Stability5
PROCESSOR CLOCK RATE1
Using an External Clock
PROCESSOR START-UP TIME1
At Power-On
After Reset Event
From Processor Power-Down
(Mode 1, Mode 2, and Mode 3)
From Total Halt or Hibernate Mode
(Mode 4 or Mode 5)
POWER REQUIREMENTS
Power Supply Voltages, VDD
Power Consumption
IDD (MCU Active Mode) 15, 16
IDD (MCU Powered Down)
IDD, Total (ADC0)16
PGA
Input Buffers
Digital Interface and Modulator
IDD (ADC1)
External Reference Input Buffers
ADuCM360/ADuCM361
Test Conditions/Comments
Min
ISOURCE = 1 mA
ISINK = 1 mA
32.768 kHz crystal inputs
IOVDD − 0.4
Typ
Max
Unit
0.4
V
V
0.8
6
6
V
V
pF
pF
32.768
±10
kHz
%
1.7
−30
+30
16
−40°C to +125°C
−1.8
Nine programmable core clock
selections within specified range
0.0625
0.8
0.5
0.032768
Includes kernel power-on execution
time
Includes kernel power-on execution
time
fCLK is the Cortex-M3 core clock
AVDD, IOVDD
Input buffers off, gain = 4, 8, or 16 only
60 μA each
16
MHz
41
ms
1.44
ms
3 to 5
fCLK
30.8
μs
1.8
Processor clock rate = 16 MHz;
all peripherals on (CLKSYSDIV = 0)
Processor clock rate = 8 MHz;
all peripherals on (CLKSYSDIV = 1)
Processor clock rate = 500 kHz; both
ADCs on (input buffers off ) with PGA
gain = 4, 1 × SPI port on, all timers on
Full temperature range, total halt mode
(Mode 4)
Reduced temperature range, −40°C
to +85°C
PGA enabled, gain ≥ 32
Gain = 4, 8, or 16, PGA only
Gain = 32, 64, or 128, PGA only
2 × input buffers = 70 μA
16
MHz
%
°C/1000Hr
MHz
+1.4
3.6
5.5
mA
3
mA
1
mA
4
μA
4
μA
320
130
180
70
70
200
120
μA
μA
μA
μA
μA
μA
μA
These numbers are not production tested, but are guaranteed by design and/or characterization data at production release.
Tested at gain = 4 after initial offset calibration.
3
Measured with an internal short. A system zero-scale calibration removes this error.
4
A recalibration at any temperature removes these errors.
5
The long term stability specification is noncumulative. The drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
6
These numbers do not include internal reference temperature drift.
7
Factory calibrated at gain = 1.
1
2
Rev. B | Page 9 of 24
V
ADuCM360/ADuCM361
Data Sheet
System calibration at a specific gain removes the error at this gain.
Input current measured with one ADC measuring a channel. If both ADCs measure the same input channel, the input current increases (approximately doubles).
10
Measured using the box method.
11
Reference DAC linearity is calculated using a reduced code range of 0x0AB to 0xF30.
12
Endurance is qualified to 10,000 cycles as per JEDEC Standard 22, Method A117, and is measured at −40°C, +25°C, and +125°C. Typical endurance at 25°C is 170,000 cycles.
13
Retention lifetime equivalent at junction temperature (TJ) = 85°C as per JEDEC Standard 22, Method A117. Retention lifetime derates with junction temperature.
14
Voltage input levels are relevant only if driving XTAL input from a voltage source. If a crystal is connected directly, the internal crystal interface determines the
common-mode voltage.
15
Typical additional supply current consumed during Flash/EE memory program and erase cycles is 7 mA.
16
Total IDD for ADC includes figures for PGA ≥ 32, input buffers, digital interface, and the Σ-Δ modulator.
8
9
RMS NOISE RESOLUTION OF ADC0 AND ADC1
Internal Reference (1.2 V)
Table 2 through Table 5 provide rms noise specifications for ADC0 and ADC1 using the internal reference (1.2 V). Table 2 and Table 3 list
the rms noise for both ADCs with various gain and output update rate values. Table 4 and Table 5 list the typical output rms noise effective
number of bits (ENOB) in normal mode for both ADCs with various gain and output update rate values. (Peak-to-peak ENOB is shown
in parentheses.)
Table 2. RMS Noise vs. Gain and Output Update Rate, Internal Reference (1.2 V), Gain = 1, 2, 4, 8, and 16
Update
Rate (Hz)
3.53
30
50
100
488
976
1953
3906
Chop/Sinc
On/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc4
Off/Sinc4
Off/Sinc4
Off/Sinc4
ADCFLT
Register
Value
0x8D7C
0x007E
0x007D
0x004D
0x100F
0x1007
0x1003
0x1001
Gain = 1,
±VREF,
ADCxMDE = 0x01
1.05
2.1
3.7
5.45
10
13.5
19.3
67.0
Gain = 2,
±500 mV,
ADCxMDE = 0x11
0.45
1.37
1.6
2.41
4.7
6.5
10
36
RMS Noise (µV)
Gain = 4,
±250 mV,
ADCxMDE = 0x21
0.23
0.63
0.83
1.13
2.2
3.3
4.7
16.6
Gain = 8,
±125 mV,
ADCxMDE = 0x31
0.135
0.37
0.47
0.63
1.3
1.7
2.6
8.8
Gain = 16,
±62.5 mV,
ADCxMDE = 0x41
0.072
0.22
0.29
0.38
0.79
1.1
1.55
4.9
Table 3. RMS Noise vs. Gain and Output Update Rate, Internal Reference (1.2 V), Gain = 32, 64, and 128
Update
Rate (Hz)
3.53
30
50
100
488
976
1953
3906
Chop/Sinc
On/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc4
Off/Sinc4
Off/Sinc4
Off/Sinc4
ADCFLT
Register
Value
0x8D7C
0x007E
0x007D
0x004D
0x100F
0x1007
0x1003
0x1001
Gain = 32, 1
±62.5 mV,
ADCxMDE =
0x49
0.067
0.202
0.24
0.35
0.7
0.99
1.78
6.44
Gain = 32,1, 2
±22.18 mV,
ADCxMDE =
0x51
0.064
0.2
0.24
0.32
0.67
0.91
1.3
2.68
RMS Noise (µV)
Gain = 64, 3
Gain = 64,3, 4
±15.625 mV,
±10.3125 mV,
ADCxMDE =
ADCxMDE =
0x59
0x61
0.073
0.055
0.196
0.16
0.25
0.21
0.36
0.27
0.71
0.58
1.01
0.74
1.48
1.15
3.59
1.4
Gain = 128, 5
±7.8125 mV,
ADCxMDE =
0x69
0.058
0.174
0.21
0.31
0.62
0.83
1.25
2.2
Gain = 128,5, 6
±3.98 mV,
ADCxMDE =
0x71
0.052
0.155
0.2
0.25
0.57
0.7
1.0
1.4
ADCxMDE = 0x49 sets the PGA for a gain of 16 with a modulator gain of 2. The modulator gain of 2 is implemented by adjusting the sampling capacitors into the
modulator. ADCxMDE = 0x51 sets the PGA for a gain of 32 with the modulator gain off. ADCxMDE = 0x49 has slightly higher noise but supports a wider input range.
2
If AVDD < 2.0 V and ADCxMDE = 0x51, the input range is ±17.5 mV.
3
ADCxMDE = 0x59 sets the PGA for a gain of 32 with a modulator gain of 2. The modulator gain of 2 is implemented by adjusting the sampling capacitors into the
modulator. ADCxMDE = 0x61 sets the PGA for a gain of 64 with the modulator gain off. ADCxMDE = 0x59 has slightly higher noise but supports a wider input range.
4
If AVDD < 2.0 V and ADCxMDE = 0x61, the input range is ±8.715 mV.
5
ADCxMDE = 0x69 sets the PGA for a gain of 64 with a modulator gain of 2. The modulator gain of 2 is implemented by adjusting the sampling capacitors into the
modulator. ADCxMDE = 0x71 sets the PGA for a gain of 128 with the modulator gain off. ADCxMDE = 0x69 has slightly higher noise but supports a wider input range.
6
If AVDD < 2.0 V and ADCxMDE = 0x71, the input range is ±3.828 mV.
1
Rev. B | Page 10 of 24
Data Sheet
ADuCM360/ADuCM361
Table 4. Typical Output RMS Noise Effective Number of Bits in Normal Mode, Internal Reference (1.2 V), Gain = 1, 2, 4, 8, and 16
Update
Rate (Hz)
3.53
Chop/Sinc
On/Sinc3
30
Off/Sinc3
50
Off/Sinc3
100
Off/Sinc3
488
Off/Sinc4
976
Off/Sinc4
1953
Off/Sinc4
3906
Off/Sinc4
1
Gain = 1,
±VREF,
ADCxMDE = 0x01
21.1
(18.4 p-p)
20.1
(17.4 p-p)
19.3
(16.6 p-p)
18.7
(16.0 p-p)
17.9
(15.2 p-p)
17.4
(14.7 p-p)
16.9
(14.2 p-p)
15.1
(12.4 p-p)
Effective Number of Bits (ENOB) by Input Voltage Range and Gain 1
Gain = 2,
Gain = 4,
Gain = 8,
±500 mV,
±250 mV,
±125 mV,
ADCxMDE = 0x11
ADCxMDE = 0x21
ADCxMDE = 0x31
21.1
21.1
20.8
(18.4 p-p)
(18.3 p-p)
(18.1 p-p)
19.5
19.6
19.4
(16.8 p-p)
(16.9 p-p)
(16.6 p-p)
19.25
19.2
19.0
(16.5 p-p)
(16.5 p-p)
(16.3 p-p)
18.66
18.75
18.6
(15.9 p-p)
(16.0 p-p)
(15.9 p-p)
17.7
17.8
17.55
(15.0 p-p)
(15.1 p-p)
(14.8 p-p)
17.2
17.2
17.2
(14.5 p-p)
(14.5 p-p)
(14.4 p-p)
16.6
16.7
16.55
(13.9 p-p)
(14.0 p-p)
(13.8 p-p)
14.8
14.9
14.8
(12.0 p-p)
(12.2 p-p)
(12.1 p-p)
Gain = 16,
±62.5 mV,
ADCxMDE = 0x41
20.7
(18.0 p-p)
19.1
(16.4 p-p)
18.7
(16.0 p-p)
18.3
(15.6 p-p)
17.3
(14.5 p-p)
16.8
(14.1 p-p)
16.3
(13.6 p-p)
14.6
(11.9 p-p)
RMS bits are calculated as follows: log2 ((2 × Input Range)/RMS Noise); peak-to-peak (p-p) bits are calculated as follows: log2 ((2 × Input Range)/(6.6 × RMS Noise)).
Table 5. Typical Output RMS Noise Effective Number of Bits in Normal Mode, Internal Reference (1.2 V), Gain = 32, 64, and 128
Update
Rate (Hz)
3.53
Chop/Sinc
On/Sinc3
30
Off/Sinc3
50
Off/Sinc3
100
Off/Sinc3
488
Off/Sinc4
976
Off/Sinc4
1953
Off/Sinc4
3906
Off/Sinc4
1
Gain = 32,
±62.5 mV,
ADCxMDE =
0x49
19.8
(17.1 p-p)
18.2
(15.5 p-p)
18.0
(15.2 p-p)
17.4
(14.7 p-p)
16.4
(13.7 p-p)
15.9
(13.2 p-p)
15.1
(12.4 p-p)
13.2
(10.5 p-p)
Effective Number of Bits (ENOB) by Input Voltage Range and Gain 1
Gain = 32,
Gain = 64,
Gain = 64,
Gain = 128,
±22.18 mV,
±15.625 mV,
±10.3125 mV,
±7.8125 mV,
ADCxMDE =
ADCxMDE =
ADCxMDE =
ADCxMDE =
0x51
0x59
0x61
0x69
19.4
18.7
18.5
18.0
(16.7 p-p)
(16.0 p-p)
(15.8 p-p)
(15.3 p-p)
17.75
17.3
17.0
16.45
(15.0 p-p)
(14.6 p-p)
(14.25 p-p)
(13.7 p-p)
17.5
16.93
16.6
16.2
(14.8 p-p)
(14.2 p-p)
(13.86 p-p)
(13.5 p-p)
17.1
16.4
16.2
15.6
(14.35 p-p)
(13.7 p-p)
(13.5 p-p)
(12.9 p-p)
16.0
15.4
15.1
14.6
(13.3 p-p)
(12.7 p-p)
(12.4 p-p)
(11.9 p-p)
15.6
14.91
14.8
14.2
(12.85 p-p)
(12.2 p-p)
(12.0 p-p)
(11.5 p-p)
15.05
14.4
14.1
13.6
(12.3 p-p)
(11.6 p-p)
(11.4 p-p)
(10.9 p-p)
14.0
13.1
13.8
12.8
(11.3 p-p)
(10.4 p-p)
(11.1 p-p)
(10.1 p-p)
Gain = 128,
±3.98 mV,
ADCxMDE =
0x71
17.2
(14.5 p-p)
15.6
(12.9 p-p)
15.3
(12.55 p-p)
15.0
(12.2 p-p)
13.8
(11.0 p-p)
13.4
(10.75 p-p)
13.0
(10.2 p-p)
12.5
(9.75 p-p)
RMS bits are calculated as follows: log2 ((2 × Input Range)/RMS Noise); peak-to-peak (p-p) bits are calculated as follows: log2 ((2 × Input Range)/(6.6 × RMS Noise)).
Rev. B | Page 11 of 24
ADuCM360/ADuCM361
Data Sheet
External Reference (2.5 V)
Table 6 through Table 9 provide rms noise specifications for ADC0 and ADC1 using the external reference (2.5 V). Table 6 and Table 7 list
the rms noise for both ADCs with various gain and output update rate values. Table 8 and Table 9 list the typical output rms noise effective
number of bits (ENOB) in normal mode for both ADCs with various gain and output update rate values. (Peak-to-peak ENOB is shown
in parentheses.)
Table 6. RMS Noise vs. Gain and Output Update Rate, External Reference (2.5 V), Gain = 1, 2, 4, 8, and 16
Update
Rate (Hz)
3.53
30
50
100
488
976
1953
3906
Chop/Sinc
On/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc4
Off/Sinc4
Off/Sinc4
Off/Sinc4
ADCFLT
Register
Value
0x8D7C
0x007E
0x007D
0x004D
0x100F
0x1007
0x1003
0x1001
Gain = 1,
±VREF,
ADCxMDE = 0x01
1.1
3
3.9
5.2
9.3
12.5
20.0
140.0
Gain = 2,
±500 mV,
ADCxMDE = 0x11
0.5
1.4
2.2
2.8
5.0
7
10
70.0
RMS Noise (µV)
Gain = 4,
±250 mV,
ADCxMDE = 0x21
0.27
0.85
0.92
1.25
2.5
3.5
5.7
35.0
Gain = 8,
±125 mV,
ADCxMDE = 0x31
0.17
0.44
0.46
0.63
1.2
1.75
2.6
17.2
Gain = 16,
±62.5 mV,
ADCxMDE = 0x41
0.088
0.27
0.3
0.38
0.75
1.2
1.71
8.9
Table 7. RMS Noise vs. Gain and Output Update Rate, External Reference (2.5 V), Gain = 32, 64, and 128
Update
Rate (Hz)
3.53
30
50
100
488
976
1953
3906
Chop/Sinc
On/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc3
Off/Sinc4
Off/Sinc4
Off/Sinc4
Off/Sinc4
ADCFLT
Register
Value
0x8D7C
0x007E
0x007D
0x004D
0x100F
0x1007
0x1003
0x1001
Gain = 32, 1
±62.5 mV,
ADCxMDE =
0x49
0.076
0.21
0.265
0.37
0.73
1.1
2.05
9.4
Gain = 32,1, 2
±22.18 mV,
ADCxMDE =
0x51
0.07
0.22
0.21
0.32
0.7
0.83
1.3
4.8
RMS Noise (µV)
Gain = 64, 3
Gain = 64,3, 4
±15.625 mV,
±10.3125 mV,
ADCxMDE =
ADCxMDE =
0x59
0x61
0.088
0.06
0.21
0.19
0.27
0.2
0.366
0.28
0.73
0.57
1.01
0.77
1.6
1.24
5.1
2.65
Gain = 128, 5
±7.8125 mV,
ADCxMDE =
0x69
0.068
0.175
0.225
0.32
0.64
0.89
1.3
3.2
Gain = 128,5, 6
±3.98 mV,
ADCxMDE =
0x71
0.58
0.17
0.19
0.26
0.5
0.75
1.1
1.88
ADCxMDE = 0x49 sets the PGA for a gain of 16 with a modulator gain of 2. The modulator gain of 2 is implemented by adjusting the sampling capacitors into the
modulator. ADCxMDE = 0x51 sets the PGA for a gain of 32 with the modulator gain off. ADCxMDE = 0x49 has slightly higher noise but supports a wider input range.
2
If AVDD < 2.0 V and ADCxMDE = 0x51, the input range is ±17.5 mV.
3
ADCxMDE = 0x59 sets the PGA for a gain of 32 with a modulator gain of 2. The modulator gain of 2 is implemented by adjusting the sampling capacitors into the
modulator. ADCxMDE = 0x61 sets the PGA for a gain of 64 with the modulator gain off. ADCxMDE = 0x59 has slightly higher noise but supports a wider input range.
4
If AVDD < 2.0 V and ADCxMDE = 0x61, the input range is ±8.715 mV.
5
ADCxMDE = 0x69 sets the PGA for a gain of 64 with a modulator gain of 2. The modulator gain of 2 is implemented by adjusting the sampling capacitors into the
modulator. ADCxMDE = 0x71 sets the PGA for a gain of 128 with the modulator gain off. ADCxMDE = 0x69 has slightly higher noise but supports a wider input range.
6
If AVDD < 2.0 V and ADCxMDE = 0x71, the input range is ±3.828 mV.
1
Rev. B | Page 12 of 24
Data Sheet
ADuCM360/ADuCM361
Table 8. Typical Output RMS Noise Effective Number of Bits in Normal Mode, External Reference (2.5 V), Gain = 1, 2, 4, 8, and 16
Update
Rate (Hz)
3.53
Chop/Sinc
On/Sinc3
30
Off/Sinc3
50
Off/Sinc3
100
Off/Sinc3
488
Off/Sinc4
976
Off/Sinc4
1953
Off/Sinc4
3906
Off/Sinc4
1
Gain = 1,
±VREF,
ADCxMDE = 0x01
22.1
(19.4 p-p)
20.7
(18.0 p-p)
20.3
(17.6 p-p)
19.9
(17.2 p-p)
19.0
(16.3 p-p)
18.6
(15.9 p-p)
17.9
(15.2 p-p)
15.1
(12.4 p-p)
Effective Number of Bits (ENOB) by Input Voltage Range and Gain 1
Gain = 2,
Gain = 4,
Gain = 8,
±500 mV,
±250 mV,
±125 mV,
ADCxMDE = 0x11
ADCxMDE = 0x21
ADCxMDE = 0x31
20.9
20.8
20.5
(18.2 p-p)
(18.1 p-p)
(17.7 p-p)
19.4
19.2
19.1
(16.7 p-p)
(16.4 p-p)
(16.4 p-p)
18.8
19.05
19.05
(16.1 p-p)
(16.3 p-p)
(16.3 p-p)
18.4
18.6
18.6
(15.7 p-p)
(15.9 p-p)
(15.9 p-p)
17.6
17.6
17.7
(14.9 p-p)
(14.9 p-p)
(14.9 p-p)
17.1
17.1
17.1
(14.4 p-p)
(14.4 p-p)
(14.4 p-p)
16.6
16.4
16.55
(13.9 p-p)
(13.7 p-p)
(13.8 p-p)
13.8
13.8
13.8
(11.1 p-p)
(11.1 p-p)
(11.1 p-p)
Gain = 16,
±62.5 mV,
ADCxMDE = 0x41
20.43
(17.7 p-p)
18.82
(16.1 p-p)
18.66
(15.9 p-p)
18.32
(15.6 p-p)
17.34
(14.6 p-p)
16.66
(13.9 p-p)
16.15
(13.4 p-p)
13.77
(11.05 p-p)
RMS bits are calculated as follows: log2 ((2 × Input Range)/RMS Noise); peak-to-peak (p-p) bits are calculated as follows: log2 ((2 × Input Range)/(6.6 × RMS Noise)).
Table 9. Typical Output RMS Noise Effective Number of Bits in Normal Mode, External Reference (2.5 V), Gain = 32, 64, and 128
Update
Rate (Hz)
3.53
Chop/Sinc
On/Sinc3
30
Off/Sinc3
50
Off/Sinc3
100
Off/Sinc3
488
Off/Sinc4
976
Off/Sinc4
1953
Off/Sinc4
3906
Off/Sinc4
1
Gain = 32,
±62.5 mV,
ADCxMDE =
0x49
19.6
(16.9 p-p)
18.2
(15.5 p-p)
17.8
(15.1 p-p)
17.4
(14.6 p-p)
16.4
(13.7 p-p)
15.8
(13.1 p-p)
14.9
(12.1 p-p)
12.7
(10.0 p-p)
Effective Number of Bits (ENOB) by Input Voltage Range and Gain 1
Gain = 32,
Gain = 64,
Gain = 64,
Gain = 128,
±22.18 mV,
±15.625 mV,
±10.3125 mV,
±7.8125 mV,
ADCxMDE =
ADCxMDE =
ADCxMDE =
ADCxMDE =
0x51
0x59
0x61
0x69
19.3
18.4
18.4
17.8
(16.55 p-p)
(15.7 p-p)
(15.7 p-p)
(15.1 p-p)
17.6
17.2
16.7
16.4
(14.9 p-p)
(14.5 p-p)
(14.0 p-p)
(13.7 p-p)
17.7
16.8
16.65
16.1
(15.0 p-p)
(14.1 p-p)
(13.9 p-p)
(13.4 p-p)
17.1
16.4
16.2
15.6
(14.35 p-p)
(13.7 p-p)
(13.4 p-p)
(12.85 p-p)
16.0
15.4
15.1
14.6
(13.2 p-p)
(12.7 p-p)
(12.4 p-p)
(11.85 p-p)
15.7
14.9
14.7
14.1
(13.0 p-p)
(12.2 p-p)
(12.0 p-p)
(11.4 p-p)
15.1
14.25
14.0
13.55
(12.3 p-p)
(11.5 p-p)
(11.3 p-p)
(10.8 p-p)
13.2
12.6
12.9
12.25
(10.4 p-p)
(9.9 p-p)
(10.2 p-p)
(9.5 p-p)
Gain = 128,
±3.98 mV,
ADCxMDE =
0x71
17.1
(14.3 p-p)
15.5
(12.8 p-p)
15.35
(12.6 p-p)
14.9
(12.2 p-p)
14.0
(11.2 p-p)
13.4
(10.6 p-p)
12.8
(10.1 p-p)
12.0
(9.3 p-p)
RMS bits are calculated as follows: log2 ((2 × Input Range)/RMS Noise); peak-to-peak (p-p) bits are calculated as follows: log2 ((2 × Input Range)/(6.6 × RMS Noise)).
Rev. B | Page 13 of 24
ADuCM360/ADuCM361
Data Sheet
I2C TIMING SPECIFICATIONS
The capacitive load for each I2C bus line (CB) is 400 pF maximum as per the I2C bus specifications. I2C timing is guaranteed by design, but
is not production tested.
Table 10. I2C Timing in Fast Mode (400 kHz)
Parameter
tL
tH
tSHD
tDSU
tDHD
tRSU
tPSU
tBUF
tR
tF
tSUP
Description
Serial clock (SCL) low pulse width
SCL high pulse width
Start condition hold time
Data setup time
Data hold time
Setup time for repeated start
Stop condition setup time
Bus free time between a stop condition and a start condition
Rise time for both SCL and serial data (SDA)
Fall time for both SCL and SDA
Pulse width of suppressed spike
Min
1300
600
600
100
0
600
600
1.3
20 + 0.1 CB
20 + 0.1 CB
0
Max
Min
4.7
4.0
4.7
250
0
4.0
4.0
4.7
Max
Unit
ns
ns
ns
ns
ns
ns
ns
s
ns
ns
ns
300
300
50
Table 11. I2C Timing in Standard Mode (100 kHz)
Parameter
tL
tH
tSHD
tDSU
tDHD
tRSU
tPSU
tBUF
tR
tF
Description
SCL low pulse width
SCL high pulse width
Start condition hold time
Data setup time
Data hold time
Setup time for repeated start
Stop condition setup time
Bus free time between a stop condition and a start condition
Rise time for both SCL and SDA
Fall time for both SCL and SDA
tBUF
Unit
μs
ns
μs
ns
μs
μs
μs
μs
μs
ns
1
300
tSUP
tR
MSB
tDSU
LSB
tSHD
P
S
tF
tDHD
tR
tRSU
tH
1
SCL (I)
MSB
tDSU
tDHD
tPSU
ACK
8
tL
9
tSUP
STOP
START
CONDITION CONDITION
1
S(R)
REPEATED
START
Figure 3. I2C-Compatible Interface Timing
Rev. B | Page 14 of 24
tF
09743-002
SDA (I/O)
Data Sheet
ADuCM360/ADuCM361
SPI TIMING SPECIFICATIONS
Table 12. SPI Master Mode Timing
Parameter
tSL
tSH
tDAV
tDOSU
tDSU
tDHD
tDF
tDR
tSR
tSF
Min
Typ
(SPIDIV + 1) × tUCLK
(SPIDIV + 1) × tUCLK
0
Max
12
12
12
12
35.5
35.5
35.5
35.5
35.5
(SPIDIV + 1) × tUCLK
58.7
16
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tUCLK = 62.5 ns. It corresponds to the internal 16 MHz clock before the clock divider.
CS
1/2 SCLK
CYCLE
3/4 SCLK
CYCLE
tCS
tSFS
SCLK
(POLARITY = 0)
tSH
tSL
tSR
SCLK
(POLARITY = 1)
tDAV
tDF
MOSI
MSB
MISO
tSF
tDR
BIT 6 TO BIT 1
MSB IN
LSB
BIT 6 TO BIT 1
LSB IN
09743-003
tDSU
tDHD
Figure 4. SPI Master Mode Timing (Phase Mode = 1)
CS
1 SCLK CYCLE
1 SCLK CYCLE
tCS
tSFS
SCLK
(POLARITY = 0)
tSH
tSL
tSR
SCLK
(POLARITY = 1)
tDAV
tDOSU
MOSI
MISO
tSF
tDF
MSB
MSB IN
tDR
BIT 6 TO BIT 1
BIT 6 TO BIT 1
LSB
LSB IN
09743-004
1
Description
SCLK low pulse width1
SCLK high pulse width1
Data output valid after SCLK edge
Data output setup time before SCLK edge1
Data input setup time before SCLK edge
Data input hold time after SCLK edge
Data output fall time
Data output rise time
SCLK rise time
SCLK fall time
tDSU
tDHD
Figure 5. SPI Master Mode Timing (Phase Mode = 0)
Rev. B | Page 15 of 24
ADuCM360/ADuCM361
Data Sheet
Table 13. SPI Slave Mode Timing
Parameter
tCS
Description
CS to SCLK edge
tSL
tSH
tDAV
tDSU
tDHD
tDF
tDR
tSR
tSF
tDOCS
tSFS
SCLK low pulse width1
SCLK high pulse width1
Data output valid after SCLK edge
Data input setup time before SCLK edge
Data input hold time after SCLK edge
Data output fall time
Data output rise time
SCLK rise time
SCLK fall time
Data output valid after CS edge
CS high after SCLK edge
Typ
Max
Unit
ns
(SPIDIV + 1) × tUCLK
(SPIDIV + 1) × tUCLK
62.5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
49.1
20.2
10.1
12
12
12
12
35.5
35.5
35.5
35.5
25
0
tUCLK = 62.5 ns. It corresponds to the internal 16 MHz clock before the clock divider.
CS
tSFS
tCS
SCLK
(POLARITY = 0)
tSH
tSL
tSR
tSF
SCLK
(POLARITY = 1)
tDAV
tDF
MISO
tDR
MSB
MOSI
BIT 6 TO BIT 1
MSB IN
LSB
BIT 6 TO BIT 1
LSB IN
09743-005
tDSU
tDHD
Figure 6. SPI Slave Mode Timing (Phase Mode = 1)
CS
tCS
tSFS
SCLK
(POLARITY = 0)
tSH
tSL
tSR
tSF
SCLK
(POLARITY = 1)
tDAV
tDOCS
tDF
MISO
MOSI
MSB
MSB IN
tDSU
tDR
BIT 6 TO BIT 1
BIT 6 TO BIT 1
LSB
LSB IN
09743-006
1
Min
62.5
tDHD
Figure 7. SPI Slave Mode Timing (Phase Mode = 0)
Rev. B | Page 16 of 24
Data Sheet
ADuCM360/ADuCM361
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 14.
Parameter
AVDD to AGND
IOVDD to DGND
Digital Input Voltage to DGND
Digital Output Voltage to DGND
Analog Inputs to AGND
Operating Temperature Range
Storage Temperature Range
Junction Temperature
ESD Rating, All Pins
Human Body Model (HBM)
Field-Induced Charged Device
Model (FICDM)
Peak Solder Reflow Temperature
SnPb Assemblies (10 sec to 30 sec)
Pb-Free Assemblies (20 sec to 40 sec)
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Rating
−0.3 V to +3.96 V
−0.3 V to +3.96 V
−0.3 V to +3.96 V
−0.3 V to +3.96 V
−0.3 V to +3.96 V
−40°C to +125°C
−65°C to +150°C
150°C
Table 15. Thermal Resistance
Package Type
48-Lead LFCSP_WQ
ESD CAUTION
±2.5 kV
±1 kV
240°C
260°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. B | Page 17 of 24
θJA
27
Unit
°C/W
ADuCM360/ADuCM361
Data Sheet
48
47
46
45
44
43
42
41
40
39
38
37
SWDIO
SWCLK
P2.0/SCL/UARTCLK
P1.7/IRQ7/PWM5/CS0
P1.6/IRQ6/PWM4/MOSI0
P1.5/IRQ5/PWM3/SCLK0
P1.4/PWM2/MISO0
P1.3/PWM1/DSR
P1.2/PWM0/RI
P1.1/IRQ4/PWMTRIP/DTR
P1.0/IRQ3/PWMSYNC/EXTCLK
IOVDD
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADuCM360/
ADuCM361
TOP
VIEW
(Not to Scale)
36
35
34
33
32
31
30
29
28
27
26
25
P0.7/POR/SOUT
P0.6/IRQ2/SIN
P0.5/CTS/IRQ1
P0.4/RTS/ECLKO
P0.3/IRQ0/CS1
P0.2/MOSI1/SDA/SOUT
P0.1/SCLK1/SCL/SIN
P0.0/MISO1
AIN11/VBIAS1
AIN10
AIN9/DACBUFF+
AIN8/EXTREF2IN–
NOTES
1. THE LFCSP HAS AN EXPOSED PAD THAT MUST BE SOLDERED TO A METAL PLATE
ON THE PCB FOR MECHANICAL REASONS AND TO DGND.
09743-007
GND_SW
VREF+
VREF–
AGND
AVDD
AVDD_REG
DAC
INT_REF
IREF
AIN5/IEXC
AIN6/IEXC
AIN7/VBIAS0/IEXC/EXTREF2IN+
13
14
15
16
17
18
19
20
21
22
23
24
RESET 1
P2.1/SDA/UARTDCD 2
P2.2/BM 3
XTALO 4
XTALI 5
IOVDD 6
DVDD_REG 7
AIN0 8
AIN1 9
AIN2 10
AIN3 11
AIN4/IEXC 12
Figure 8. Pin Configuration
Table 16. Pin Function Descriptions
Pin No.
1
2
3
Mnemonic
RESET
P2.1/SDA/UARTDCD
P2.2/BM
4
5
6
7
8
XTALO
XTALI
IOVDD
DVDD_REG
AIN0
9
AIN1
10
AIN2
11
AIN3
12
AIN4/IEXC
13
GND_SW
Description
Reset Pin, Active Low Input. An internal pull-up is provided.
General-Purpose Input/Output P2.1/I2C Serial Data Pin/UART Data Carrier Detect Pin.
General-Purpose Input/Output P2.2/Boot Mode Input Select Pin. When this pin is held low
during and for a short time after any reset sequence, the part enters UART download mode.
External Crystal Oscillator Output Pin. Optional 32.768 kHz source for real-time clock.
External Crystal Oscillator Input Pin. Optional 32.768 kHz source for real-time clock.
Digital System Supply Pin. This pin must be connected to DGND via a 0.1 µF capacitor.
This pin must be connected to DGND via a 470 nF capacitor and to Pin 18, AVDD_REG.
ADC Analog Input 0. This pin can be configured as a positive or negative input to either ADC
in differential or single-ended mode.
ADC Analog Input 1. This pin can be configured as a positive or negative input to either ADC
in differential or single-ended mode.
ADC Analog Input 2. This pin can be configured as a positive or negative input to either ADC
in differential or single-ended mode.
ADC Analog Input 3. This pin can be configured as a positive or negative input to either ADC
in differential or single-ended mode.
ADC Analog Input 4/Excitation Current Source. This pin can be configured as a positive or
negative input to either ADC in differential or single-ended mode (AIN4). This pin can also be
configured as the output pin for Excitation Current Source 0 or Excitation Current Source 1 (IEXC).
Sensor Power Switch to Analog Ground Reference.
Rev. B | Page 18 of 24
Data Sheet
Pin No.
14
Mnemonic
VREF+
15
VREF−
16
17
18
AGND
AVDD
AVDD_REG
19
20
21
DAC
INT_REF
IREF
22
AIN5/IEXC
23
AIN6/IEXC
24
AIN7/VBIAS0/IEXC/EXTREF2IN+
25
AIN8/EXTREF2IN−
26
AIN9/DACBUFF+
27
AIN10
28
AIN11/VBIAS1
29
30
P0.0/MISO1
P0.1/SCLK1/SCL/SIN
31
P0.2/MOSI1/SDA/SOUT
32
P0.3/IRQ0/CS1
33
P0.4/RTS/ECLKO
34
35
36
37
38
P0.5/CTS/IRQ1
P0.6/IRQ2/SIN
P0.7/POR/SOUT
IOVDD
P1.0/IRQ3/PWMSYNC/EXTCLK
39
P1.1/IRQ4/PWMTRIP/DTR
40
41
42
P1.2/PWM0/RI
P1.3/PWM1/DSR
P1.4/PWM2/MISO0
ADuCM360/ADuCM361
Description
External Reference Positive Input. An external reference can be applied between the VREF+
and VREF− pins.
External Reference Negative Input. An external reference can be applied between the VREF+
and VREF− pins.
Analog System Ground Reference Pin.
Analog System Supply Pin. This pin must be connected to AGND via a 0.1 µF capacitor.
Internal Analog Regulator Supply Output. This pin must be connected to AGND via a 470 nF
capacitor and to Pin 7, DVDD_REG.
DAC Voltage Output.
Internal Reference. This pin must be connected to ground via a 470 nF decoupling capacitor.
Optional Reference Current Resistor Connection for the Excitation Current Sources. The reference
current used for the excitation current sources is set by a low drift (5 ppm/°C) external resistor
connected to this pin.
ADC Analog Input 5/Excitation Current Source. This pin can be configured as a positive or
negative input to either ADC in differential or single-ended mode (AIN5). This pin can also be
configured as the output pin for Excitation Current Source 0 or Excitation Current Source 1 (IEXC).
ADC Analog Input 6/Excitation Current Source. This pin can be configured as a positive or
negative input to either ADC in differential or single-ended mode (AIN6). This pin can also be
configured as the output pin for Excitation Current Source 0 or Excitation Current Source 1 (IEXC).
ADC Analog Input 7/Bias Voltage Output/Excitation Current Source/External Reference 2 Positive
Input. This pin can be configured as a positive or negative input to either ADC in differential or
single-ended mode (AIN7). This pin can also be configured as an analog output pin to generate a
bias voltage, VBIAS0 of AVDD_REG/2 (VBIAS0); as the output pin for Excitation Current Source 0 or
Excitation Current Source 1 (IEXC); or as the positive input for External Reference 2 (EXTREF2IN+).
ADC Analog Input 8/External Reference 2 Negative Input. This pin can be configured as a
positive or negative input to either ADC in differential or single-ended mode (AIN8). This pin
can also be configured as the negative input for External Reference 2 (EXTREF2IN−).
ADC Analog Input 9/Noninverting Input to the DAC Output Buffer. This pin can be configured
as a positive or negative input to either ADC in differential or single-ended mode (AIN9). This
pin can also be configured as the noninverting input to the DAC output buffer when the DAC
is configured for NPN mode (DACBUFF+).
ADC Analog Input 10. This pin can be configured as a positive or negative input to either ADC
in differential or single-ended mode.
ADC Analog Input 11/Bias Voltage Output. This pin can be configured as a positive or negative
input to either ADC in differential or single-ended mode (AIN11). This pin can also be configured
as an analog output pin to generate a bias voltage, VBIAS1 of AVDD_REG/2 (VBIAS1).
General-Purpose Input/Output P0.0/SPI1 Master Input, Slave Output Pin.
General-Purpose Input/Output P0.1/SPI1 Serial Clock Pin/I2C Serial Clock Pin/UART Serial Input
(Data Input for the UART Downloader).
General-Purpose Input/Output P0.2/SPI1 Master Output, Slave Input Pin/I2C Serial Data Pin/
UART Serial Output (Data Output for the UART Downloader).
General-Purpose Input/Output P0.3/External Interrupt Request 0/SPI1 Chip Select Pin (Active
Low).
General-Purpose Input/Output P0.4/UART Request-to-Send Signal/External Clock Output Pin
for Test Purposes.
General-Purpose Input/Output P0.5/UART Clear-to-Send Signal/External Interrupt Request 1.
General-Purpose Input/Output P0.6/External Interrupt Request 2/UART Serial Input.
General-Purpose Input/Output P0.7/Power-On Reset Pin (Active High)/UART Serial Output.
Digital System Supply Pin. This pin must be connected to DGND via a 0.1 µF capacitor.
General-Purpose Input/Output P1.0/External Interrupt Request 3/PWM External Synchronization
Input/External Clock Input Pin.
General-Purpose Input/Output P1.1/External Interrupt Request 4/PWM External Trip Input/
UART Data Terminal Ready Pin.
General-Purpose Input/Output P1.2/PWM0 Output/UART Ring Indicator Pin.
General-Purpose Input/Output P1.3/PWM1 Output/UART Data Set Ready Pin.
General-Purpose Input/Output P1.4/PWM2 Output/SPI0 Master Input, Slave Output Pin.
Rev. B | Page 19 of 24
ADuCM360/ADuCM361
Pin No.
43
Mnemonic
P1.5/IRQ5/PWM3/SCLK0
44
P1.6/IRQ6/PWM4/MOSI0
45
P1.7/IRQ7/PWM5/CS0
46
47
48
P2.0/SCL/UARTCLK
SWCLK
SWDIO
EP
Data Sheet
Description
General-Purpose Input/Output P1.5/External Interrupt Request 5/PWM3 Output/SPI0 Serial
Clock Pin.
General-Purpose Input/Output P1.6/External Interrupt Request 6/PWM4 Output/SPI0 Master
Output, Slave Input Pin.
General-Purpose Input/Output P1.7/External Interrupt Request 7/PWM5 Output/SPI0 Chip
Select Pin (Active Low).
General-Purpose Input/Output P2.0/I2C Serial Clock Pin/Input Clock Pin for UART Block Only.
Serial Wire Debug Clock Input Pin.
Serial Wire Debug Data Input/Output Pin.
Exposed Pad. The LFCSP has an exposed pad that must be soldered to a metal plate on the
PCB for mechanical reasons and to DGND.
Rev. B | Page 20 of 24
Data Sheet
ADuCM360/ADuCM361
TYPICAL PERFORMANCE CHARACTERISTICS
60
250
50
200
SETTLING TIME (ms)
30
IP
IN
IP – IN
20
10
0
–10
150
BOOST = 0
100
50
–20
BOOST = 30
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
COMMON-MODE VOLTAGE (V)
0
09743-008
–30
0
200
400
600
800
1000
1200
CAPACITANCE (nF)
Figure 9. Input Current vs. Common-Mode Voltage (VCM),
Gain = 4, ADC Input = 250 mV, AVDD = 3.6 V, TA = 25°C,
VCM = ((AIN+) + (AIN−))/2
09743-011
INPUT CURRENT (nA)
40
Figure 12. VBIAS Output Settling Time vs. Load Capacitance,
TA = 25°C, IOVDD and AVDD = 3.3 V
30
5
4
25
PULL-UP RESISTANCE (kΩ)
2
1
0
–1
–2
IP
IN
IP – IN
–4
0.5
1.0
1.5
2.0
2.5
3.0
3.5
COMMON-MODE VOLTAGE (V)
10
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
VOLTAGE (V)
Figure 10. Input Current vs. Common-Mode Voltage (VCM),
Gain = 128, ADC Input = 7.8125 mV, AVDD = 3.6 V, TA = 25°C,
VCM = ((AIN+) + (AIN−))/2
Figure 13. Digital Input Pin Pull-Up Resistance Value vs. Voltage Applied
to Digital Pin, TA = 25°C, IOVDD = 3.4 V
14000000
60
12000000
PULL-UP RESISTANCE (kΩ)
50
10000000
8000000
6000000
4000000
40
30
20
–40
–20
0
20
40
60
TEMPERATURE (°C)
80
100
120
Figure 11. ADC Codes (Decimal Values) vs. Die Temperature
0
0
0.5
1.0
VOLTAGE (V)
1.5
2.0
09743-013
10
2000000
09743-010
ADC CODES
15
5
–5
0
20
09743-012
–3
09743-009
INPUT CURRENT (nA)
3
Figure 14. Digital Input Pin Pull-Up Resistance Value vs. Voltage Applied
to Digital Pin, TA = 25°C, IOVDD = 1.8 V
Rev. B | Page 21 of 24
ADuCM360/ADuCM361
Data Sheet
TYPICAL SYSTEM CONFIGURATION
46
45
44
43
SWCLK
P2.0/SCL/
UARTCLK
P1.7/IRQ7/
PWM5/CS0
P1.6/IRQ6/
PWM4/MOSI0
P1.5/IRQ5/
PWM3/SCLK0
RESET
12pF
DVDD
DGND
1
RESET
2
P2.1/SDA/UARTDCD
3
P2.2/BM
41
42
P1.3/PWM1/
DSR
SWCLK
47
P1.4/PWM2/
MISO0
SWDIO
48
SWDIO
Figure 15 shows a typical ADuCM360/ADuCM361 configuration. This figure illustrates some of the hardware considerations. The bottom
of the LFCSP package has an exposed pad that must be soldered to a metal plate on the PCB for mechanical reasons and to DGND. The
metal plate of the PCB can be connected to ground. The 0.47 µF capacitor on the AVDD_REG and DVDD_REG pins should be placed
as close to the pins as possible. In noisy environments, an additional 1 nF capacitor can be added to IOVDD and AVDD.
P1.2/PWM0/RI 40
P1.1/IRQ4/PWMTRIP/DTR 39
4
XTALO
5
XTALI
P0.7/POR/SOUT 36
6
IOVDD
P0.6/IRQ2/SIN 35
7
DVDD_REG
8
AIN0
9
AIN1
P0.3/IRQ0/CS1 32
10
AIN2
P0.2/MOSI1/SDA/SOUT 31
P0.1/SCLK1/SCL/SIN 30
12pF
DVDD
P1.0/IRQ3/PWMSYNC/EXTCLK 38
IOVDD 37
0.1µF
DGND
P0.5/CTS/IRQ1 34
0.1µF
11
AIN3
12
AIN4/IEXC
13
GND_SW
14
VREF+
AIN10 27
15
VREF–
AIN9/DACBUFF+ 26
16
AGND
AIN8/EXTREF2IN– 25
P0.0/MISO1 29
INT_REF
IREF
AIN5/IEXC
AIN6/IEXC
AIN7/VBIAS0/
IEXC/
EXTREF2IN+
17
AVDD
DAC
AIN11/VBIAS1 28
AVDD
0.47µF
P0.4/RTS/ECLKO 33
ADuCM360
AVDD_REG
DGND
18
19
20
21
22
23
24
0.1µF
0.47µF
150kΩ
ADP1720ARMZ-3.3
DVDD
RESET
RESET
GND
DGND
SWIO
SWDIO
TX
SWCLK
SWCLK
RX
5V USB
IN
1µF
DGND
AVDD
1.6Ω
OUT
560Ω
EN
4.7µF
0.1µF
4.7µF
0.1µF
GND
AGND
DGND
DGND
Figure 15. Typical System Configuration
Rev. B | Page 22 of 24
AGND AGND
09743-100
INTERFACE BOARD CONNECTOR
0.47µF
Data Sheet
ADuCM360/ADuCM361
OUTLINE DIMENSIONS
0.30
0.23
0.18
PIN 1
INDICATOR
48
37
36
1
0.50
BSC
TOP VIEW
0.80
0.75
0.70
0.45
0.40
0.35
5.20
5.10 SQ
5.00
EXPOSED
PAD
12
25
24
13
BOTTOM VIEW
0.05 MAX
0.02 NOM
COPLANARITY
0.08
0.20 REF
SEATING
PLANE
PIN 1
INDICATOR
0.25 MIN
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
SECTION OF THIS DATA SHEET.
COMPLIANT TO JEDEC STANDARDS MO-220-WKKD.
112408-B
7.00
BSC SQ
Figure 16. 48-Lead Lead Frame Chip Scale Package [LFCSP_WQ]
7 mm × 7 mm Body, Very Very Thin Quad
(CP-48-4)
Dimensions shown in millimeters
ORDERING GUIDE
Model 1
ADuCM360BCPZ128
ADuCM360BCPZ128-R7
ADuCM361BCPZ128
ADuCM361BCPZ128-R7
EVAL-ADuCM360QSPZ
1
ADCs
Dual 24-Bit
Dual 24-Bit
Single 24-Bit
Single 24-Bit
Flash/SRAM
128 kB/8 kB
128 kB/8 kB
128 kB/8 kB
128 kB/8 kB
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Z = RoHS Compliant Part.
Rev. B | Page 23 of 24
Package Description
48-Lead LFCSP_WQ
48-Lead LFCSP_WQ
48-Lead LFCSP_WQ
48-Lead LFCSP_WQ
ADuCM360 QuickStart Plus
Development System
Package
Option
CP-48-4
CP-48-4
CP-48-4
CP-48-4
Ordering
Quantity
750
750
ADuCM360/ADuCM361
Data Sheet
NOTES
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).
©2012–2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09743-0-7/13(B)
Rev. B | Page 24 of 24
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