Texas Instruments ADS794xEVM, User Manual, Page: 5 / 31

4
10
12
SMA
J10
SMA
J11
SMA
J4
SMA
J5
A0(+)
A1(+)
A0( )
-
A1( )
-
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
OPA836 in Inverting
Configuration
P2
AIN1P (pin 8)
AIN1N (pin 7)
AIN0P (pin 5)
AIN0N (pin 6)
ADS7945
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Analog Interface
5 SBAU194B – August 2011 – Revised September 2017
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ADS794xEVM and ADS794xEVM-PDK
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
EVM Operation section
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.
Figure 1. ADS794xEVM and ADS7945 Analog Inputs