Ads794Xevm And Ads7946 Analog Inputs - Texas Instruments ADS794x EVM Series User Manual

Analog Interface
2.2 ADS794xEVM Analog Inputs with ADS7946 Installed
Each channel of the ADS7946 uses one OPA836 to drive a single-ended input voltage. 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
how this offset is used to allow bipolar signals for the ADS7946 with jumper J6.
Figure 2 shows the ADS794xEVM analog inputs with the ADS7946 installed.
P2
A0(+)
4
A0( ) -
10
A1(+)
12
A1( ) -
2.3 External Reference Input
Pin P2.20 is an analog input for an external reference voltage when J2 is in position 2-3. The source that
provides this external reference should have a voltage between 2.5 V and the analog power-supply
voltage.
6
ADS794xEVM and ADS794xEVM-PDK
No SMA
Open
J10
OPA836 in Inverting
Configuration
SMA
J11
Open
No SMA
J4
OPA836 in Inverting
SMA
J5
Figure 2. ADS794xEVM and ADS7946 Analog Inputs
Copyright © 2011, Texas Instruments Incorporated
EVM Operation
Configuration
www.ti.com
section explains in detail
ADS7946
AIN0N (pin 6)
AIN0P (pin 5)
AIN1N (pin 7)
AIN1P (pin 8)
SBAU194 – August 2011
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