Ads794Xevm And Ads7945 Analog Inputs - Texas Instruments ADS794x EVM Series User Manual

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2.1 ADS794xEVM Analog Inputs with ADS7945 Installed
Each channel of the ADS7945 uses two OPA836 operational amplifiers to drive the fully differential inputs.
The input signals can be applied to either the SMA or P2 header connectors. These operational amplifiers
offset the input signal to use an inverting configuration with a single supply. The
explains in detail how this offset is used to allow bipolar signals for the ADS7945 with jumper J6.
Figure 1 illustrates the ADS794xEVM analog inputs with the ADS7945 installed.
P2
A0(+)
4
A0( ) -
10
A1(+)
12
A1( ) -
SBAU194 – August 2011
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OPA836 in Inverting
SMA
Configuration
J10
OPA836 in Inverting
Configuration
SMA
J11
OPA836 in Inverting
SMA
J4
OPA836 in Inverting
SMA
J5
Figure 1. ADS794xEVM and ADS7945 Analog Inputs
Copyright © 2011, Texas Instruments Incorporated
Configuration
Configuration
ADS794xEVM and ADS794xEVM-PDK
Analog Interface
EVM Operation section
ADS7945
AIN0N (pin 6)
AIN0P (pin 5)
AIN1N (pin 7)
AIN1P (pin 8)
5