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Texas Instruments AMC1035EVM User guides
User's Guide
SBAU320 – July 2018
AMC1035 Evaluation Module
This user’s guide describes the characteristics, operation, and use of the AMC1035EVM. A complete
circuit description as well as schematic diagram and bill of materials are included.
The following related documents are available through the Texas Instruments web site at www.ti.com.
Table 1. Related Documentation
1
2
3
4
5
6
7
8
Device
Literature Number
AMC1035
SBAS837
Contents
EVM Overview ...............................................................................................................
Analog Interface..............................................................................................................
Power Supply.................................................................................................................
Output Reference ............................................................................................................
Digital Interface ..............................................................................................................
Manchester Coding Enabled ...............................................................................................
General Operation Tables ..................................................................................................
BOM, Schematic, and Layout ..............................................................................................
2
3
3
3
4
4
5
6
List of Figures
1
AMC1035EVM Schematic - Analog Interface, Power Supply, Output Reference................................... 3
2
AMC1035EVM Schematic - Digital Interface, Manchester Coding Enabled ......................................... 4
3
AMC1035EVM Schematic .................................................................................................. 6
4
AMC1035EVM - PCB Top Layer Silk Screen ............................................................................ 7
5
AMC1035EVM - PCB Top Layer Routing ................................................................................ 7
List of Tables
1
Related Documentation ..................................................................................................... 1
2
J1: REFOUT .................................................................................................................. 5
3
J2: ANALOG INPUTS ....................................................................................................... 5
4
J3: POWER SUPPLY ....................................................................................................... 5
5
J4: DATA OUTPUT .......................................................................................................... 5
6
J5: EXTERNAL CLOCK
7
JP1: MANCHESTER CODING ENABLED ............................................................................... 5
8
AMC1035EVM Bill of Materials ............................................................................................ 6
....................................................................................................
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1
EVM Overview
1
EVM Overview
1.1
Features
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This EVM supports the following features:
• Full-featured Evaluation Board for the AMC1035 single-channel delta-sigma modulator
• ±1-V Input Voltage Range
• Configurable Power Supply Input
• Configurable Clock Input
• Integrated 2.5 V, ±5-mA Reference for Ratiometric Measurements
• Manchester Coded or Uncoded Bitstream Output
• Screw terminals for easy access to analog inputs and outputs
1.2
Introduction
The AMC1035 device is a precision, delta-sigma (ΔΣ) modulator that operates from a single 3.0-V to 5.5-V
supply and with an externally generated clock signal in the range of 9 MHz to 21 MHz. The differential ±1V input structure of the device is optimized for use in a noisy environment, as usually found in industrial
applications.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the AMC1035EVM.
1.3
Trademarks
All trademarks are the property of their respective owners.
2
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Analog Interface
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2
Analog Interface
The input to the AMC1035EVM is routed from a two-wire screw terminal at J2. This screw terminal gives
the user access to the inputs, AINP and AINN, of the AMC1035 through a low pass filter created by R1,
R2, and C2. The input circuit for the AMC1035EVM is shown in Figure 1 below.
3
Power Supply
The AMC1035EVM requires one power rail for VDD . 5 V is a typical value for VDD and VDD can be 3-5.5 V
should not exceed 6.5 V. This is connected using pin 1 of J3 referenced to ground, pin 2 of J3.
4
Output Reference
The AMC1035EVM provides an output reference voltage of 2.5 V. This is accessible using pin 1 of J1 and
can be seen in the figure below. REFOUT is used to provide excitation for RT1 and the maximum output
current is +/-5 mA.
Figure 1. AMC1035EVM Schematic - Analog Interface, Power Supply, Output Reference
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Digital Interface
5
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Digital Interface
The AMC1035EVM digital input/output interface is composed of two, two terminal screw connectors
located at J4 and J5. Pin 1 of J4 is the output data from the modulator and pin 1 of J5 is the clock input for
the modulator U1. A 9 MHz to 21 MHz external clock must be applied to pin 1 of J5 referenced to ground,
pin 2 of J5. The magnitude of this clocking signal should not exceed VDD +0.5 V.
6
Manchester Coding Enabled
The AMC1035 offers the IEEE 802.3-compliant Manchester coding feature that generates at least one
transition per bit to support clock signal recovery from the bitstream. This feature is enabled by leaving the
jumper JP1 installed. To disable the Manchester coding feature, remove JP1.
Figure 2. AMC1035EVM Schematic - Digital Interface, Manchester Coding Enabled
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General Operation Tables
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General Operation Tables
The following section describes the general operation of the AMC1035EVM
CAUTION
Carefully review the AMC1035 product data sheet for the limitations of the
analog input range and ensure that the appropriate analog/digital voltages are
applied prior to connecting any analog input to the EVM.
Table 2. J1: REFOUT
Pin Number
Signal
J1.1
REFOUT
J1.2
GND
Description
2.5 V Output Reference Voltage
Ground Reference
Table 3. J2: ANALOG INPUTS
Pin Number
Signal
J2.1
AINP
Non-inverting analog input to the AMC1035
Description
J2.2
AINN
Inverting input to the AMC1035
Table 4. J3: POWER SUPPLY
Pin Number
Signal
J3.1
VDD
J3.2
GND
Description
Externally supplied power rail. 3 V to 5.5 V, should not exceed 6.5 V
Ground Reference
Table 5. J4: DATA OUTPUT
Pin Number
Signal
J4.1
DOUT
Data Output
Description
J4.2
GND
Ground Reference
Table 6. J5: EXTERNAL CLOCK
Pin Number
Signal
J5.1
CLKIN
J5.2
GND
Description
Externally supplied clocking signal. 9-21 MHz, should not exceed VDD +0.5 V
Ground Reference
Table 7. JP1: MANCHESTER CODING ENABLED
Pin Number
Jumper
JP1
INSTALLED
Manchester coding enabled
Description
JP1
UNINSTALLED
Manchester coding disabled
Once the AMC1035EVM is supplied with power and an external clock, the digital outputs become active.
An analog input signal may be applied directly at screw terminal J2. Please see Figure 1 and Table 2 for
details. The linear analog input range, AINP to AINN, is +/- 1 V and the full-scale range is +/-1.25 V.
As the input voltage approaches the maximum input level of +1 V, the 1s density of the modulator output
will approach 90%. Likewise, when the input voltage approaches the lower limit of -1V the 1s density will
be approximately 10%.
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BOM, Schematic, and Layout
8
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BOM, Schematic, and Layout
This section contains the complete bill of materials, schematic diagram and printed circuit board (PCB)
layout of the AMC1035EVM.
NOTE: Board layouts are not to scale. These are intended to show how the board is laid out; they
are not intended to be used for manufacturing AMC1035EVM PCBs.
8.1
Bill of Materials
Table 8. AMC1035EVM Bill of Materials
Designators
8.2
Description
Manufacturer
Mfg. Part Number
C2
CAP, CERM, 820 pF, 50 V, +/- 5%, C0G/NP0, 0805
AVX
08055A821JAT2A
C3
CAP, CERM, 0.1 uF, 100 V, +/- 5%, X7R, 1206
TDK
C3216X7R2E104K160AA
C4
CAP, CERM, 1 uF, 25 V, +/- 10%, X7R, 1206
AVX
C1206C105K3RACAUTO
C5
CAP, CERM, 30 pF, 100 V, +/- 5%, C0G/NP0, 0805
AVX
08051A300JAT2A
J1, J2, J3, J4, J5
Terminal Block, 3.5mm Pitch, 2x1, TH
On-Shore Technology
ED555/2DS
JP1
Header, 100mil, 2x1, Gold, TH
Samtec
TSW-102-07-G-S
R1, R2
RES, 1.00 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805
Panasonic
ERJ-6ENF1001V
R3, R5, R6
RES, 0, 1%, 0.5 W, 0805
Keystone
5106
R4
RES, 47.5, 1%, 0.125 W, AEC-Q200 Grade 0, 0805
Vishay-Dale
CRCW080547R5FKEA
SH-JP1
Shunt, 2mm, Gold plated, Black
Samtec
2SN-BK-G
U1
Delta-Sigma Modulator with Bipolar Input and Reference
Output, D0008A (SOIC-8)
Texas Instruments
AMC1035D
C1
CAP, CERM, 820 pF, 50 V, +/- 5%, C0G/NP0, 0805
Not Installed
R7
RES, 10.0 k, 1%, 0.125 W, AEC-Q200 Grade 0, 0805
Not Installed
RT1
Thermistor NTC, 1.0k ohm, 5%, 0805
Not Installed
Schematic
Figure 3. AMC1035EVM Schematic
6
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BOM, Schematic, and Layout
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8.3
PCB Layout
Figure 4. AMC1035EVM - PCB Top Layer Silk Screen
Figure 5. AMC1035EVM - PCB Top Layer Routing
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