Evm Analog Interface; Adc Analog Input Connections And Filter; Figure 3-1. Adc Analog Input Connections And - Texas Instruments ADS8688EVM-PDK User Manual

EVM Analog Interface

3 EVM Analog Interface
The ADS8688EVM is an evaluation module built to the TI Modular EVM system specifications. The EVM by itself
has no microprocessor and cannot run software. Thus, the EVM is available as part of the ADS8688EVM-PDK
kit that combines the ADS8688EVM as a daughter board with PHI controller using software as a graphical user
interface (GUI).

3.1 ADC Analog Input Connections and Filter

The circuit shown in Figure 3-1
reapeated eight times for all eight input channels. The resistor R01 can be used for input float detection but
is not populated in the default configuration. The TVS diode D01, can be used for input protection, but is not
populated. Refer to Video Series on Electrical
the input filter for the ADC. R05 connects the negative input to ground. R05 can be removed and the negative
input can be accessed in the header J6.
4 ADS8688EVM-PDK Evaluation Module
shows a typical analog input connection for the ADS8688 ADC. This circuit is
Overstress. C01, R03, and R04 form the 79.5kHz low pass input
J00
R02
Ain0+
1
0
R01
DNP
49.9k
5-1814832-1
GND GND
J6
Ain0-
1 2
Ain0+
3 4
Ain1-
5 6
Ain1+
7 8
TSW-104-07-G-D
GND
Figure 3-1. ADC Analog Input Connections and Filter
Copyright © 2021 Texas Instruments Incorporated
R03
A0+
1.00k
D01
DNP
SMBJ14CA C01
14V 50V
1000pF
GND
R04
Ain0- A0-
1.00k
R05
0
GND
SBAU230C – AUGUST 2014 – REVISED MARCH 2021
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