Analog Interface; Ads9218 Device Connections; Figure 2-1. Connections To Ads9218 - Texas Instruments ADS9218EVM-PDK User Manual

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2 Analog Interface

As an analog interface, the evaluation board uses fully differential amplifiers (FDAs) to drive the ADS9218 input
signals. The ADS9218 includes an integrated voltage reference, but an external reference can be used and is
jumper selectable on the hardware. This section covers driver details, including jumper configuration for different
input signal options.

2.1 ADS9218 Device Connections

The digital communications lines for the ADC (shown in
signaling (LVDS) standard and are connected with optional termination resistors. A digital serial peripheral
interface (SPI) port is used to configure registers in the device. The SDO output line includes a termination.
5V
C19
10V
1µF
GND GND
1V8_VDD
AINP_A
AINP_A
AINM_A
AINM_A
VCMOUT
VCMOUT
AINP_B
AINP_B
AINM_B
AINM_B
EXT_SMPL_CLKM
SMPL_CLKM
SMPL_CLKP
SMPL_CLKP
SCLK
SCLK
SDI
SDI
SDO
SDO
CSz
CSz
SPI_EN
SPI_EN
RESETz
RESETz
PWDNz
PWDNz
DOUTP_A
R26
DNP
100
DOUTM_A
SBAU409 – SEPTEMBER 2022
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C20 C21 C16 C15
10V 10V 10V 10V
0.1µF 0.1µF 0.1µF 1µF
GND GND GND
U1
C23
13
AVDD_1V8
10V
37
AVDD_1V8
0.1µF
1
AVDD_5V
GND
10
AVDD_5V
14
DVDD_1V8
35
DVDD_1V8
36
DVDD_1V8
R9 20.0
3
AINP_A
4
AINM_A
R12 20.0
5
VCMOUT
R20 20.0
7
AINP_B
8
AINM_B
R24 20.0
31
DCLKIN
32
SMPL_CLK
18
SCLK
19
SDI
R22 33
20
SDO
17
CS
16
SPI_EN
21
RESET
22
PWDN
ADS9227IRHAT
DOUTP_B
R27
DNP
100
DOUTM_B

Figure 2-1. Connections to ADS9218

Copyright © 2022 Texas Instruments Incorporated
Figure 2-1) all follow the low-voltage differential
1V8_VDD
28
DOUTP_A
27
DOUTM_A
24
DCLKP
23
DCLKM
30
FCLKP
29
FCLKM
26
DOUTP_B
25
DOUTM_B
33
SYNC
39
REFIO
6
REFM
11
REFM
40
REFM
2
AGND
9
AGND
12
AGND
38
AGND
15
DGND
34
DGND
41
Thermal_Pad
GND
DCLKP
R28
DNP
100
DCLKM
Analog Interface
DOUTP_A
DOUTP_A
DOUTM_A
DOUTM_A
DCLKP
DCLKP
DCLKM
DCLKM
FCLKP
FCLKP
FCLKM
FCLKM
DOUTP_B
DOUTP_B
DOUTM_B
DOUTM_B
SMPL_SYNC
SMPL_SYNC
REFIO
REFIO
C22
10V
1µF
GND
NT1
Net-Tie
GND
FCLKP
R29
DNP
100
FCLKM
ADS9218EVM-PDK Evaluation Module 5