Connecting Negative Inputs To Ground - Texas Instruments ADS8688EVM-PDK User Manual

EVM Analog Interface
Table 2 summarizes the J7 analog interface connector.
Pin
Number
J7.2
J7.4
J7.6
J7.8
J7.10
J7.12
J7.14
J7.16
J7.18
J7.20
J7.1
J7.3
J7.5
J7.7
J7.9
J7.11
J7.13
J7.15
J7.17
J7.19
2.1

Connecting Negative Inputs to Ground

The negative analog inputs for all channels (except for the AUX channel) are capable of accepting a ±100-
mV signal. The negative analog inputs can either be connected to the analog ground or a ±100-mV signal
can be applied on these inputs.
inputs to analog ground.
Signal Jumper
A0–
A1–
A2–
A3–
A4–
A5–
A6–
A7–
AUX–
6
ADS8688EVM-PDK Evaluation Module
Table 2. J7: Analog Interface Connections
Signal
A6+ Positive analog input for channel AIN6
A7+ Positive analog input for channel AIN7
A0+ Positive analog input for channel AIN0
A1+ Positive analog input for channel AIN1
AUX+ Positive analog input for AUX channel
A2+ Positive analog input for channel AIN2
A3+ Positive analog input for channel AIN3
A4+ Positive analog input for channel AIN4
A5+ Positive analog input for channel AIN5
GND Analog ground connection
A6– Negative analog input for channel AIN6
A7– Negative analog input for channel AIN7
A0– Negative analog input for channel AIN0
A1– Negative analog input for channel AIN1
AUX– Connected to analog ground
A2– Negative analog input for channel AIN2
A3– Negative analog input for channel AIN3
A4– Negative analog input for channel AIN4
A5– Negative analog input for channel AIN5
GND Analog ground connection
Table 3 describes the appropriate jumper settings for connecting these
Table 3. Connecting Negative Analog Inputs to Ground
Position for Connecting to
Analog Ground
J22 Closed
J16 Closed
J26 Closed
J27 Closed
J28 Closed
J29 Closed
J24 Closed
J23 Closed
NA Always connected to GND
Copyright © 2014, Texas Instruments Incorporated
Description
Position for Applying a ±100-mV Signal
Open
Open
Open
Open
Open
Open
Open
Open
NA
SBAU230A – August 2014 – Revised December 2014
www.ti.com
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