ADS8372EVM
This user's guide describes the characteristics, operation, and use of the ADS8372
16-bit, 600 kHz, high speed, serial interface Analog-to-Digital converter Evaluation
Board (EVM). A complete circuit description, schematic diagram, and bill of materials
are included.
The following related documents are available on the TI web site at www.ti.com .
Data Sheets: Literature Numbers:
ADS8372 SLAS451
REF1004C-2.5 SBVS002
SN74AHC1G125 SCLS377
THS4131 SLOS318
OPA627AU SBOS165
User's Guide
SLAU160 – July 2005
Contents
1 EVM Overview ............................................................................................................... 2
2 Analog Interface .............................................................................................................. 2
3 Digital Interface .............................................................................................................. 4
4 Power Supplies .............................................................................................................. 5
5 Using the EVM ............................................................................................................... 5
6 ADS8372EVM Bill Of Materials ............................................................................................ 7
8 Board Layers ................................................................................................................. 9
9 Schematics .................................................................................................................. 11
List of Figures
1 Input Buffer Circuit ........................................................................................................... 3
2 Top Layer ..................................................................................................................... 9
3 Power Plane .................................................................................................................. 9
4 Ground Plane ............................................................................................................... 10
5 Bottom Layer ................................................................................................................ 10
List of Tables
1 Analog Input Connector ..................................................................................................... 2
2 Jumper Setting ............................................................................................................... 4
3 Pinout for Serial Control Connector P2 ................................................................................... 4
4 Power Supply Test Points .................................................................................................. 5
5 Power Connector (J3) Pin Out ............................................................................................. 5
7 ADS8372EVM Bill of Materials ............................................................................................. 7
SLAU160 – July 2005 ADS8372EVM 1
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EVM Overview
1 EVM Overview
1.1 Features
2 Analog Interface
• Full-featured evaluation board for the ADS8372 16-bit, 600 kHz, single channel, high-speed
serial-interface analog-to-digital converter (ADC)
• On board signal conditioning
• On board reference
• Input and output digital buffer
The ADS8372EVM ships with buffer U13 configured in a unity-gain, single-ended to differential out
configuration. The common-mode voltage pin of the THS4131 is factory set to 2.0 V on the evaluation
module, and can be adjusted using potentiometer RP1. The potentiometer connects between the output of
reference buffer U3 and ground. The single-ended input signal can be applied at pin-connector P1 pin 2 or
via SMA connectors J2 (non-inverting input). The buffer circuit can be reconfigured for a fully differential
input by installing resistors R4 and R31 and removing R16. The inverting leg of the differential signal can
be connected to connector P1 pin 1 or SMA connector J1 (inverting input). See Table 1 for the pinout of
the analog connector, P1. See Section 9 for the EVM schematic diagrams.
The analog-to-digital converter accepts a pseudo-bipolar differential input. A pseudo-bipolar differential
signal is a differential signal that has a common-mode voltage such that each leg is always equal to or
above zero volts. The common mode voltage should be half the reference voltage. The peak-to-peak
amplitude on each input leg can be as large as the reference voltage.
Table 1. Analog Input Connector
Description Signal Name Connector pin# Signal Name Description
Inverting Input –IN P1.1 P1.2 +IN Non-inverting Input
Reserved N/A P1.3 P1.4 N/A Reserved
Reserved N/A P1.5 P1.6 N/A Reserved
Reserved N/A P1.7 P1.8 N/A Reserved
Pin tied to Ground AGND P1.9 P1.10 N/A Reserved
Pin tied to Ground AGND P1.11 P1.12 N/A Reserved
Reserved N/A P1.13 P1.14 N/A Reserved
Pin tied to Ground AGND P1.15 P1.16 N/A Reserved
Pin tied to Ground AGND P1.17 P1.18 N/A Reserved
Reserved N/A P1.19 P1.20 REF+ External Reference Input
2.1 Signal Conditioning
It is a recommended practice to buffer the analog input to any SAR-type converter with a high-speed,
low-noise amplifier with fast settling time. The amplifier circuit shown in Figure 1 is the buffer circuit used
on the ADS8372EVM. This circuit consists of the THS4131, a high-speed, low-noise, fully differential
amplifier configured as a single-ended in to differential out, unity gain buffer. This circuit was optimized to
achieve the AC specifications (i.e., SNR, THD, SFDR, etc.) listed in the ADS8372 data sheet.
The type of input capacitors used in the signal path can make a few decibels of difference in AC
performance. Polypropylene or C0G-type capacitors are recommended for the input signal path.
ADS8372EVM 2 SLAU160 – July 2005
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_++
−
1 F
0.1 F
1 F
0.1 F
V
CC
−V
CC
2.048 V
1 k
68 pF
C0G
1 k
68 pF
C0G
1 k
1 k
V
IN
THS4131
25
25
6800 pF
C0G
(+) IN
(−) IN
Analog Interface
Polypropylene capacitors cause the least distortion of the input signal and have excellent long-term
stability, but are expensive and bulky. C0G ceramic capacitors cost less, come in smaller packages and
perform as well as polypropylene capacitors in many applications, but are not as stable over time and
temperature. The 68 pF and 6800 pF capacitors installed on the EVM are low-cost C0G type,
manufactured by TDK Corporation.
Figure 1. Input Buffer Circuit
2.2 Reference Voltage
The EVM allows the designer to select internal, on-board, or user-supplied reference-voltage sources. The
internal reference is a 4.096 V reference voltage generated by the ADS8372 on pin 9. The on-board
reference can be either a REF3040 (U1) or REF1004-2.5 (U14). The EVM ships with the REF1004-2.5
installed. The reference amplifier, U3, is set for a gain of 1.6, enabling it to take a 2.5 V input and output
4.1 V for use with the converter, or as part of the common-mode voltage circuit for the input buffer (U13).
The user-supplied reference voltage is applied to connector P1 pin 20, and can be routed through the
reference buffer and filtered, if desired. The EVM allows a number of configurations. Refer to Table 1 for
jumper settings, or the full schematic in Section 9 for more information. The common footprint for U14
allows users to evaluate this converter with various reference ICs.
The EVM ships with the internal reference tied directly to the reference pin of the converter.
SLAU160 – July 2005 ADS8372EVM 3
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Digital Interface
Table 2. Jumper Setting
Reference Pins/Pads
Designator
SJP1 Buffer onboard reference (REF1004-2.5) Shorted
Buffer user supplied reference voltage applied at P1 pin 20. Open Shorted
SJP2 Connect external reference directly to SJP4 Shorted
Connect buffered external reference to SJP4 Open Shorted
SJP3 Connect U3 negative supply to ground Shorted Open
Connect U3 negative supply to –VCC Open Shorted
SJP4 Connect internal reference to REFIN Shorted
Connect external reference to REFIN Open Shorted
SJP5 Connect common-mode voltage to VOCM pin of THS4131 Shorted
W1 Connect +5VD to BVDD Shorted
Connect +3.3VD to BVDD Open Shorted
W3 Set power down signal (PD) high Shorted N/A
W4 Set frame sync signal (FS) high Shorted N/A
W5 Set chip select signal (CS) low Shorted
(1)
Factory Installed
Description
1-2 2-3
(1)
(1)
(1)
(1)
(1)
(1)
Open
Open
(1)
Open
N/A
Open
N/A
3 Digital Interface
The ADS8372EVM is designed for easy interfacing to multiple platforms. Samtec plug and socket
connectors provide a convenient dual row header/socket combination at P1 and P2 to plug into prototype
boards or ribbon cable over to user system boards.
The digital input and output signals for the converter is available at connector P2 on the ADS8372EVM,
see Table 3 for the connector pinout.
Table 3. Pinout for Serial Control Connector P2
Description Signal Name Connector Pin Signal Name Description
Chip Select CS P2.1 P2.2 N/A Reserved
Serial Clock SCLK P2.3 P2.4 DGND Ground
Reserved N/A P2.5 P2.6 N/A Reserved
Frame Sync FS P2.7 P2.8 N/A Reserved
Reserved N/A P2.9 P2.10 N/A Reserved
Reserved N/A P2.11 P2.12 N/A Reserved
Serial Data Out SDO P2.13 P2.14 N/A Reserved
BUSY BUSY P2.15 P2.16 N/A Reserved
Convert Start CONVST P2.17 P2.18 DGND Ground
Power down PD P2.19 P2.20 N/A Reserved
ADS8372EVM 4 SLAU160 – July 2005
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4 Power Supplies
Power Supplies
The EVM accepts four power supplies
• A differential ( ± ) dc supply for the dual-supply op amps. The maximum recommended voltage is ± 15
Vdc
• A single +5.0 V dc supply for the analog section of the board (A/D + Reference).
• A single +5.0 V or +3.3 V dc supply for digital section of the board (A/D + buffers).
There are two ways to provide these voltages. The first is to connect the voltages to the test points listed
in Table 4 .
Table 4. Power Supply Test Points
Test Point Signal Description
TP1 +VA Connect +15.0 V dc supply for amplifier
TP2 –VA Connect –15.0 V dc supply for amplifier
TP3 +BVDD Apply +3.3 V dc or +5.0 V dc. See ADC data sheet for full range.
TP4 +AVCC Apply +5.0 V dc
The second is to use the power connector J3, and derive the voltages elsewhere. Table 5 gives the pinout
for J3. If using this connector, set W1 jumper to connect +3.3VD or +5VD from J3 to +BVDD. Shunt pins
1-2 to select +5VD, or pins 2-3 to select +3.3VD as the source for the digital-buffer-voltage supply
(+BVDD).
5 Using the EVM
The ADS8372EVM serves three functions:
1. As a reference design
2. As a prototype board
3. As a software test platform
5.1 Reference Design
As a reference design, the ADS8372EVM contains the essential circuitry to showcase the analog-to-digital
converter. This essential circuitry includes the input amplifier, reference circuit, and buffers. The EVM
analog-input circuit is optimized for a 100-kHz input signal; therefore, users may need to adjust the
resistor and capacitor values to accommodate higher frequencies. In ac-type applications where signal
distortion is concern, polypropylene or C0G type capacitors are recommended for use in the signal path.
Typical fully-differential amplifiers configured for single-ended in to differential out can distort the signal in
an attempt to equalize the input pins. This distortion is specially evident when step inputs are applied.
Therefore, users who will be applying a step input to the converter should use discrete amplifiers for the
single-ended-to-differential conversion of the signal. The Differential Input, Differential Output Configur-
ation circuit shown in the Theory of Operation section of the ADS8372 datasheet (literature number
SLAS451) can be used. In applications where the input is continuous, the single amplifier solution using
the THS4131, can effectively drive the converter inputs.
Table 5. Power Connector (J3) Pin Out
Signal J1 Pin Signal
+VA(+15V) 1 2 –VA(–15 V)
+5VA 3 4 N/C
DGND 5 6 AGND
N/C 7 8 N/C
+3.3VD 9 10 +5VD
SLAU160 – July 2005 ADS8372EVM 5
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Using the EVM
5.2 Prototype Board
As a prototype board, the buffer circuit has resistor pads for configuring the input as either single-ended or
fully differential input. The input circuit can be modified to accommodate user prototype needs, whether it
be evaluating another differential amplifier or limiting noise for best performance. The analog, power, and
digital connectors can be made to plug into a standard 0.1” breadboard or ribbon cables to interface
directly to FPGAs or processors.
5.3 Software Test Platform
As a software test platform, connectors P1 and P2 plug into the serial interface connectors of the 5-6K
interface card. The 5-6K interface card plugs into the C5000 and C6000 Digital Signal Processor starter
kits (DSK). Refer to the 5-6K Interface Card User’s Guide (SLAU104 ) for more information.
ADS8372EVM 6 SLAU160 – July 2005
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6 ADS8372EVM Bill Of Materials
The following table contains a complete bill of materials for the ADS8372EVM. The schematic diagram is
also provided for reference. Contact the Product Information Center or email dataconvapps@list.ti.com for
questions regarding this EVM.
QTY Value Footprint Manufacturer Description
1 49.9 R1 603 Panasonic - ECG or ERJ-3EKF49R9V RES 49.9 Ω 1/16 W 1% 0603 SMD
1 1.2 k Ω R2 603 Yageo America or 9C06031A1201FKHFT RES 1.20 k Ω 1/10 W 1% 0603 SMD
4 NI R3 R4 R5 R31 805 NOT INSTALLED NOT INSTALLED
8 100 Ω R6 R21 R22 603 Panasonic - ECG or Alter- ERJ-3EKF1000V RES 100 Ω 1/16 W 1% 0603 SMD
1 100 Ω R7 805 Panasonic - ECG or ERJ-6ENF1000V RES 100 Ω 1/10 W 1% 0805 SMD
7 10 k Ω R8 R10 R11 603 Panasonic - ECG or ERJ-3EKF1002V RES 10.0K Ω 1/16 W 1% 0603 SMD
1 910 Ω R14 805 Panasonic - ECG or ERJ-6GEYJ911V RES 910 Ω 1/8 W 5% 0805 SMD
3 1 k Ω R15 R16 R17 805 Panasonic - ECG or ERJ-6ENF1001V RES 1.00 k Ω 1/10 W 1% 0805 SMD
1 768 Ω R18 603 Panasonic - ECG or ERJ-3EKF7680V RES 768 Ω 1/16 W 1% 0603 SMD
2 0 Ω R19 R36 603 Panasonic - ECG or ERJ-3GEY0R00V RES ZERO Ω 1/16 W 5% 0603 SMD
2 1 k Ω R28 R29 603 Panasonic - ECG or ERJ-3EKF1001V RES 1.00 k Ω 1/16 W 1% 0603 SMD
1 NI R30 603 NOT INSTALLED NOT INSTALLED
2 24.9 Ω R33 R34 805 Panasonic - ECG or ERJ-6ENF24R9V RES 24.9 Ω 1/10 W 1% 0805 SMD
1 49.9 k Ω R35 805 Panasonic - ECG or ERJ-6ENF4992V RES 49.9 k Ω 1/10 W 1% 0805 SMD
2 0 R37 R38 1206 Panasonic - ECG or ERJ-8GEY0R00V RES 0 Ω 1/4 W 5% 1206 SMD
1 47 µ F C1 1206 TDK Corporation or C3216X5R0J476M CAP CER 47 µ F 6.3 V X5R 20% 1206
5 1 µ F C2 C3 C4 C5 805 TDK Corporation or C2012X7R1E105K CAP CER 1.0 µ F 25 V X7R 0805 T/R
3 1 µ F C6 C7 C44 603 TDK Corporation or C1608X5R1A105KT CAP CER 1.0 µ F 10 V X5R 10% 0603
15 0.1 µ F C8 C9 C10 603 TDK Corporation or C1608X7R1E104K CAP CER 0.10 µ F 25 V X7R 10% 060
5 2.2 µ F C14 C15 C24 603 TDK Corporation or C1608X5R1A225MT CAP CER 2.2 µ F 6.3 V X5R 20% 0603
5 NI C29 C42 603 NOT INSTALLED NOT INSTALLED
9 0.01 µ F C35 C36 C37 603 TDK Corporation or C1608X7R1H103KT CAP CER 10000 pF 50 V X7R 10% 0603
1 10 µ F C34 3528 Kemet or Alternate T491B106K016AS CAPACITOR TANT 10 µ F 16 V 10% SMD
1 6800 µ F C46 C43 C63 805 TDK Corporation or C2012C0G1H682J CAP CER 6800 pF 50 V C0G 5% 0805
4 10 µ F C47 C48 C49 1206 TDK Corporation or C3216X5R1C106KT CAP CER 10 µ F 16 V X5R 20% 1206
4 10 µ F C51 C52 C53 6032 Pansonic - ECG or ECS-T1EC106R CAP 10 µ F 25 V Tantalum TE SMD
2 68 pF C32 C33 603 TDK Corporation or C1608C0G1H680J CAP CER 68 pF 50 V C0G 5% 0603
2 0.01 µ F C56 C57 1206 TDK Corporation or C3216X7R1H103KT CAP 10000 pF 50 V CERAMIC X7R 1206
4 1000 pF C59 C60 C61 603 TDK Corporation or C1608C0G1H102KT CAP CER 1000 pF 50 V C0G 0603 T/R
2 NI C30 C31 805 NOT INSTALLED NOT INSTALLED 1/10 W 0805 Chip resistor
Table 7. ADS8372EVM Bill of Materials
Reference Manufacturer's
Designators Part Number
Alternate
Alternate
R23 R24 R25 nate
R26 R27
Alternate
R12 R13 R32 Alternate
R39
Alternate
Alternate
Alternate
Alternate
Alternate
Alternate
Alternate
Alternate
Alternate
C45 Alternate
Alternate
C11 C12 C13 Alternate
C17 C18 C19
C20 C21 C22
C23 C26 C28
C25 C27 Alternate
C38 C39 C40 Alternate
C41 C55 C58
Alternate
C50 Alternate
C54 Alternate
Alternate
Alternate
C62 C64 Alternate
ADS8372EVM Bill Of Materials
SLAU160 – July 2005 ADS8372EVM 7
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ADS8372EVM Bill Of Materials
QTY Value Footprint Manufacturer Description
1 10 k Ω RP1 BOURNS_3296Y Bourns Inc. 3296Y-1-103 POT 10 k Ω 3/8" SQ CERM SL MT
4 L1 L2 L3 L4 805 TDK Corporation MMZ2012R601A FERRITE CHIP 600 Ω 500 mA 0805
2 NI U1 U2 3-SOT-23 NOT INSTALLED NOT INSTALLED REF3040 50 ppm/ ° C, 50 µ A in SOT23-3
1 U3 8-SOP(D) Texas Instruments OPA627AU DiFet amplifier
7 U5 U6 U7 U8 5-SOT(DBV) Texas Instruments SN74AHC1G125DBVR Single bus buffer gate/line driver with 3-state
1 ADS8372 U12 28-PQFP(QFN) Texas Instruments ADS8372IBRHPT ADS8372 16-bit serial 600 ksps
1 THS4131 U13 8-SOP(D) Texas Instruments THS4131ID High-speed low noise, fully differential I/O
1 REF1004-2.5 U14 8-SOP(D) Texas Instruments REF1004C-2.5 2.5 V Micropower voltage reference
1 3POS_JUMPER W1 3pos_jump Samtec TSW-103-07-L-S 3 Position jumper _ 0.1" spacing
3 2POS_JUMPER W3 W4 W5 2pos_jump Samtec TSW-102-07-L-S 2 Position jumper _ 0.1" spacing
1 SJP2 SJP5 SJP2 NOT INSTALLED NOT INSTALLED Pad 2 position jumper
4 SJP3 SPJ1 SPJ2 SJP3 NOT INSTALLED NOT INSTALLED Pad 3 position jumper
2 SMA_PCB_MT J1 J2 SMA_JACK Johnson Components Inc. 142-0701-301 Right angle SMA connector
1 Power supply J3 5x2x0.1_ Samtec SSW-105-22-S-D-VS 0.025" SMT socket - bottom side of PWB
1 Samtec TSM-105-01-T-D-V-P 0.025" SMT plug - top side of PWB
2 10x2x0.1 P1 P2 10x2x0.1_ Samtec SSW-110-22-S-D-VS 0.025" SMT socket - bottom side of PWB
2 Samtec TSM-110-01-T-D-V-P 0.025" SMT plug - top side of PWB
10 TP_0.025 TP1 TP2 TP3 test_point2 Keystone Electronics 5000K-ND Test point PC MINI 0.040"D black
4 TP_0.25 TP10 TP13 test_point2 Keystone Electronics 5001K-ND Test point PC MINI 0.040"D black
Table 7. ADS8372EVM Bill of Materials (continued)
Reference Manufacturer's
Designators Part Number
U9 U10 U11 output
SPJ3 SPJ4
SMT_SOCKET
SMT_LPUG_
&_SOCKET
TP4 TP5 TP6
TP7 TP8 TP11
TP12
TP9 TP14
CMOS voltage reference
amplifiers
ADS8372EVM 8 SLAU160 – July 2005
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8 Board Layers
Board Layers
Figure 2. Top Layer
SLAU160 – July 2005 ADS8372EVM 9
Figure 3. Power Plane
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Board Layers
Figure 4. Ground Plane
ADS8372EVM 10 SLAU160 – July 2005
Figure 5. Bottom Layer
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Schematics
9 Schematics
Schematic diagrams are appended following this page.
SLAU160 – July 2005 ADS8372EVM 11
1 2 3 4 56
A
B
C
D
6
54321
D
C
B
A
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BlockDiagram.schADATE: 30-Jun-2005
ADS8372EVM/ADS8382EVM
6458774
Serial Control
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
P2
Analog Input
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
P1
+VA
-VA
CS
FS
PD
SCLK
+AVCC
+VA
-VA
+BVDD
B_SDO
+IN
EXT_REF
B_BUSY
CONVST
-IN
Circuits
J2
+AVCC
+BVDD
Lijoy Philipose
Lijoy Philipose
1 2
3 4
5 6
7 8
9 10
J3
Power Supply
+VA -VA
+5VD
AGND
+AVCC
TP4
TP3
TP1
TP2
DGND
W1
+3.3VD
CS
SCLK
FS
B_SDO
PD
CONVST
B_BUSY
J1
1 2 3 4 5 6
A
B
C
D
6
54321
D
C
B
A
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Circuits
A
DATE: 30-Jun-2005
Circuits
6458774
C35
0.01uF
C20
0.1uF
C38
0.01uF
C24
2.2uF
C25
2.2uF
C39
0.01uF
C27
2.2uF
C41
0.01uF
+5VCC
+5VCC
+5VCC
C14
2.2uF
C36
0.01uF
+5VCC
C15
2.2uF
C37
0.01uF
+VBD
EXT_REF
31
2
SJP4
+
C34
10uF
C1
47uF
R18
768
R6
100
C29
NI
+VCC
C2
1uFC80.1uF
-VCC
C9
0.1uF
C3
1uF
IN
1
OUT
2
GND
3
U1
NI
+5VCC
R2
1.2k
3 1
2
SJP2
3 1
2
SJP1
R19
0
Lijoy Philipose
Lijoy Philipose
3
2
6
74
5
1
U3
OPA627
R1
50
31
2
SJP3
TP5
CS
SCLK
FS
PD
B_SDO
CS
SCLK
FS
R11
10k
R12
10k
+VBD
R13
10k
PD
+
C54
10uF
+
C51
10uF
TP8
+5VCC
C55
0.01uF
C11
0.1uF
TP9
TP7
+VBD
C58
0.01uF
C13
0.1uF
TP14
C47
10uF
C50
10uF
C62
1000pF
C59
1000pF
+AVCC
+BVDD
L3
MMZ2012R601A
+
C53
10uF
+
C52
10uF
C6
1uF
C7
1uF
C56
0.01uF
C57
0.01uF
TP11
TP12
TP13
+VCC
-VCC
C48
10uF
C49
10uF
C60
1000pF
C61
1000pF
+VA
-VA
TP10
AGND1AGND
2
+VA
3
AGND4AGND
5
VA
6
REFM
7
REFIN
8
REFOUT
9
NC
10
IN+
11
IN-
12
NC
13
VA
14
AGND15VA16VA17AGND18AGND19BVDD20BGND
21
BUSY
22
SDO
23
SCLK
24
CONVST
25
CS
26
FS
27
PD
28
U12
ADS8372/ADS8382
CONVST
SDO
BUSY
B_BUSY
CONVST
B_PD
B_FS
B_CS
B_CONVST
B_SCLK
R8
10k
R10
10k
W3 W4
W5
C26
0.1uF
C40
0.01uF
+5VCC
R28 1k
R29
1k
R21 100
R22 100
R23 100
R24 100
R25 100
R26
100
R27
100
C42
NI
C43 NI R30
NI
+VBD
+VBD
C23
0.1uF
+VBD
C17
0.1uF
OE
1
A
2
GND3Y
4
VCC
5
U5
SN74AHC1G125
OE
1
A
2
GND3Y
4
VCC
5
U7
SN74AHC1G125
OE
1
A
2
GND3Y
4
VCC
5
U6
SN74AHC1G125
C18
0.1uF
OE
1
A
2
GND3Y
4
VCC
5
U8
SN74AHC1G125
OE
1
A
2
GND3Y
4
VCC
5
U9
SN74AHC1G125
OE
1
A
2
GND3Y
4
VCC
5
U10
SN74AHC1G125
OE
1
A
2
GND3Y
4
VCC
5
U11
SN74AHC1G125
+VBD
C19
0.1uF
+VBD
C21
0.1uF
+VBD
C22
0.1uF
+VBD
+VBD
C28
0.1uF
-IN
-VCC
+VCC
C33
68pF
R17
1k
C12
0.1uF
C4
1uF
C5
1uF
C10
0.1uF
R33
25
C30
NI
R15
1k
R34
25
C31
NI
+IN
C45
1uF
R7
100
R14
910
R3
NI
R16
1k
TP6
5
4
8
1
2
+
-
VOCM
VOUT-
VOUT+
36
+VCC
-VCC
7
NC
U13
THS4131
12
SJP5
IN
1
OUT
2
GND
3
U2
NI
+5VCC
C44
1uF
C46
6800pF
R4
NI
R31
NI
R5
NI
C32
68pF
*
*
*
NC
1
+VIN
2
EN
3
GND4NC
5
VREF
6
NC
7
NC
8
U14
REF1004-2.5
+5VCC
C64
NI
C63
NI
R35
49.9k
+5VCC
R36
0
R38
0
R37
0
RP1
10K
R32
10K
R39
10K
L4
MMZ2012R601A
L2
MMZ2012R601A
L1
MMZ2012R601A
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