Texas Instruments | ADC12EU050 Octal, 12-bit, 40-50MSPS Sigma-Delta A/D Converter | User Guides | Texas Instruments ADC12EU050 Octal, 12-bit, 40-50MSPS Sigma-Delta A/D Converter User guides

Texas Instruments ADC12EU050 Octal, 12-bit, 40-50MSPS Sigma-Delta A/D Converter User guides
User's Guide
SNAU020 – September 2013
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS
Sigma-Delta Analog-to-Digital Converter
This Evaluation Board is used to evaluate one of the A/D Converter ADC12EU050. The ADC is a 12 bit
converter that provides data at a rate of 45 MHz.
The evaluation board is designed to be used with the WaveVision5™ Data Capture Board which is
connected to a personal computer through a USB port and running WaveVision5™ software, operating
under Microsoft Windows. The software can perform an FFT on the captured data upon command and, in
addition to a frequency domain plot, shows dynamic performance in the form of SNR, SINAD, THD SFDR
and ENOB.
1
2
3
4
5
6
7
Contents
Board Assembly ............................................................................................................. 2
Quick Start ................................................................................................................... 2
Functional Description ...................................................................................................... 3
3.1
Analog Input ........................................................................................................ 3
3.2
ADC Reference ..................................................................................................... 3
3.3
ADC Input Clock ................................................................................................... 3
3.4
Power Supply Connections ....................................................................................... 4
3.5
Reset ................................................................................................................ 4
3.6
Sleep ................................................................................................................. 4
3.7
Input Common Mode .............................................................................................. 5
3.8
Default Jumper and Switch Settings ............................................................................ 5
Software and SPI Registers ............................................................................................... 5
4.1
SPI Registers ....................................................................................................... 5
Hardware Schematics ...................................................................................................... 6
Evaluation Board Layout ................................................................................................... 9
Evaluation Board Bill of Materials ....................................................................................... 13
List of Figures
1
Major Component Locations ...............................................................................................
2
2
Input clock circuit ............................................................................................................
3
3
Power Supply Connections ................................................................................................
4
4
Schematic - 1 of 3
..........................................................................................................
..........................................................................................................
Schematic - 3 of 3 ..........................................................................................................
Layer 1: Top .................................................................................................................
Layer 2 : Internal Ground Plane .........................................................................................
Layer 3 : Internal Power Plane ..........................................................................................
Layer 4: Bottom ............................................................................................................
6
5
Schematic - 2 of 3
7
6
7
8
9
10
8
9
10
11
12
List of Tables
1
Board Jumpers and Switches .............................................................................................
5
2
Bill of Materials.............................................................................................................
13
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Board Assembly
1
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Board Assembly
The ADC12EU050 Evaluation Board comes pre-assembled. Refer to the Bill of Materials in Section 7 for a
description of components, to Figure 1 for major component placement and to Section 5 for the Evaluation
Board schematic.
Input Clock circuitry
Inputs
ADC12EU050
WV5 Connector
Hardware
Reset
Sleep
Power Connectors
Figure 1. Major Component Locations
2
Quick Start
Refer to Figure 1 for locations of jumpers, test points and major components. The board is configured by
default to use an on board crystal clock source and internal reference. Refer to Section 3 for detailed
information on jumper settings.
You must have the WaveVision5™ software to test this board. You can download the latest version from
the Texas Instruments website.
1. Connect the ADC12EU050 evaluation board to the WaveVision5™ Data Capture Board.
2. Apply power to the WaveVision5™ Data Capture Board.
3. Connect power to the ADC12EU050 board as described in Section 3.4, and power it up.
4. Connect the WaveVision5™ board to the computer using a USB cable.
5. Start the WaveVision5™ software.
6. Connect a signal from a 50-Ω source to connector a channel input. Be sure to use a bandpass filter
before the Evaluation Board.
7. Adjust the input signal amplitude as needed to ensure that the signal does not over-range by
examining an FFT of the output data with the WaveVision™ software.
2
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter
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Functional Description
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3
Functional Description
The ADC12EU050 Evaluation Board schematic is shown in Section 5. A list of default switch and jumper
settings can be found in Section 3.8.
3.1
Analog Input
The analog input is supplied through standard SMA connectors. The evaluation board is designed for
single ended inputs, which are converted to differential by the transformers.
It must be ensured that a high quality signal source is used so that the ADC dynamic performance can be
properly evaluated. A bandpass filter on the input signal is highly recommended.
3.2
ADC Reference
The ADC12EU050 can use an internal or external reference. This evaluation board is configured to use
the internal reference.
3.3
ADC Input Clock
The ADC12EU050 can only be clocked at 45MHz. The input clock circuit is shown in Figure 2.
Figure 2. Input clock circuit
Select “External Clock” with switch S2 which disables the on-board crystal oscillator. It enables the user to
connect a single ended clock to P11. This clock is converted to a differential signal by the transformer T9.
Selecting “On Board Clock” with switch S2 is not supported unless a 45MHz Crystal Oscillator is
populated at IC1.
The external clock amplitude and waveform are fairly flexible, but a 600mVpp differential square wave at
the chip inputs is recommended.
By changing the 0 ohm resistors R24, R25, R28 and R29 other clock input configurations can be realized.
For example, a fully differential clock could be supplied, bypassing the on-board transformer.
If a single ended clock is supplied to the ADC, then the LVDS termination resistor, R26, must be removed.
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Functional Description
3.4
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Power Supply Connections
+1.8V
Digital Ground
+1.2V
Digital Ground
+1.2V
Analog Ground
Power to the board is supplied through the power connectors P14, P16 and P18. The required voltages
are shown in Figure 3 and described underneath.
Figure 3. Power Supply Connections
P14: Analog power and ground
• ADC12EU050 analog supply, VA.
• Connect VA to 1.2V, AGND to ground
• Current can be measured across P13
P16: Digital power and ground
• ADC12EU050 digital supply, VD
• Connect VD to 1.2V, DRGND to ground
• Current can be measured across P15
P18: Output driver power and ground
• ADC12EU050 output driver supply, VDR
• Connect VDR to 1.8V, DRGND to ground (same as DRGND of P16)
• Current can be measured across P17
Generally, all grounds can be tied together, as can analog and digital supplies (VA and VD).
The data sheet for the ADC12EU050 specifies that the output driver supply voltage (VDR) can be 1.2V or
1.8V. Due to the design of the evaluation system, specifically the distance from the ADC12EU050 to the
Xilinx Virtex4 FPGA on the WaveVision5™ board and the connector through which the LVDS outputs are
routed, VDR should be kept at 1.8V.
A VDR of 1.2V can be used, but in this case the LVDS current drive (I_drive, SPI register 0x18, bits 3:2)
must be increased to 5mA.
3.5
Reset
The reset button pulls the RSTb pin of the ADC12EU050 low, resetting the ADC. The reset button only
affects the ADC, not any other component on the board, or on the WaveVision5™ board.
3.6
Sleep
The sleep switch puts the ADC input sleep mode, by connecting the SLEEP pin to VDR.
4
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter
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Software and SPI Registers
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3.7
Input Common Mode
Jumper P21 can be used to force a common mode on the ADC inputs. In its default configuration, the
evaluation board has capacitively coupled ADC inputs, and using the Input Common Mode jumper will not
have any effect.
3.8
Default Jumper and Switch Settings
On delivery, the board’s jumpers and switches should be set as defined in Table 1. Any directions are
defined when the board is positioned as in Figure 1.
Table 1. Board Jumpers and Switches
Jumper or Switch
4
Default Position
P2
Open
P4
Closed
P13
Closed
P15
Closed
P17
Closed
P21
Open
S2
Left (On Board Clock)
S3
Left (Sleep mode not active)
Software and SPI Registers
The ADC12EU050 evaluation board is designed to be used with the WaveVision5™ data capture board
and software. The latest version of the WaveVision5™ software must be used.
4.1
SPI Registers
As described in the ADC12EU050 datasheet, there are many user registers accessible via the SPI
interface.
These registers can all be programmed via the “Registers” tab in the WaveVision5™ software.
All registers and values are described in the ADC12EU050 data sheet, which is available from the Texas
Instruments website.
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Hardware Schematics
5
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Hardware Schematics
ADC12EU050
Figure 4. Schematic - 1 of 3
6
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-toDigital Converter
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Hardware Schematics
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Figure 5. Schematic - 2 of 3
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Hardware Schematics
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Figure 6. Schematic - 3 of 3
8
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analog-toDigital Converter
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Evaluation Board Layout
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6
Evaluation Board Layout
Figure 7. Layer 1: Top
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Evaluation Board Layout
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Figure 8. Layer 2 : Internal Ground Plane
10
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter
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Evaluation Board Layout
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Figure 9. Layer 3 : Internal Power Plane
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Evaluation Board Layout
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Figure 10. Layer 4: Bottom
12
ADC12EU050: Ultra-low Power, Octal, 12-bit, 45MSPS Sigma-Delta Analogto-Digital Converter
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Evaluation Board Bill of Materials
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7
Evaluation Board Bill of Materials
Table 2. Bill of Materials
QTY.
Designator
Footprint
Value
Description
1
*1
QFN10X10-68
ADC12EU050
ADC
48
C1–C31, C33–C40,
C42–C44, C46–C49,
C51, C53, C55
CC1608-0603
100nF
Capacitor (Semiconductor SIM Model)
1
C28
CC3216-1206
10uF
Capacitor (Semiconductor SIM Model)
6
C32, C41, C45, C50,
C52, C54
CC3225-1210
47uF
Capacitor (Semiconductor SIM Model)
1
IC1
CSX750FJC
Citizen CSX750FJC50.000M-UT
Crystal Oscillator
1
J1
HMZD_2PR_RA_HDR
HMZd – Tyco Electronics part no
6469028-1
HMZd Connector 60 pin
10
P1, P3, P5–P12
SMA
1
P2
HDR2X3
Header 2x3
Header, 3-Pin, Dual row
4
P14, P16, P18
LP2
Lumberg KRESS02 Terminal Block
Terminal Block
4
P4, P13, P15, P17, P21 HDR1X2
Header2x1
Jumper Wire
1
Q1
SOT23
BCW66H
NPN General Purpose Transistor
9
R33, R24, R25, R28,
R29, R4, R8, R2, R3
CR1608-0603
0
Semiconductor Resistor
1
R15
CR1608-0603
2K
Semiconductor Resistor
1
R13
CR1608-0603
4.7K
Semiconductor Resistor
7
R11, R36, R37, R38,
R1, R21, R23
CR1608-0603
10K
Semiconductor Resistor
RF Coaxial PCB Connector, MMCX; ThruHole, Vertical Mount Plug, 50 Ω Impedance
1
R6
CR1608-0603
33
Semiconductor Resistor
10
R9, R12, R14,
R16–R19, R22, R30,
R31
CR1608-0603
49.9
Semiconductor Resistor
4
R32, R5, R7, R10
CR1608-0603
100
Semiconductor Resistor
3
R20, R34, R35
CR2012-0805
10K ± 1%
Semiconductor Resistor
1
R26
CR1005-0402
100
Semiconductor Resistor
1
R27
3296Y
25K
Potentiometer
1
S1
PushButton
OMRON B3S-1000
Push Button
1
S2
DIP-6
Tyco ASE22
Double-Pole, Double-Throw Switch
1
S3
SW-DIP1
EAO part no 09-03290-01
Single Switch
9
T1–T9
ADT1-6T
Mini Circuits ADT1-6T
Transformer
1
U1
DQFN_50M_16_2P5X3P5
FXL4TD245
4-bit level shifter
1
U2
SOIC8_05_WG244_L200
M24C02-WMN6P
EEPROM, STMicroelectronics,
M24C02-WMN6P
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