米6体育平台手机版

SBOU286A October 2022 – December 2022 INA350 , INA351

5.2.2 Buffered-Reference Voltage Connection

A buffered-reference configuration is useful when the source impedance is high (for example, a voltage divider). Buffering a high-impedance source with an operational amplifier provides a low-impedance source and preserves common-mode rejection. Figure 5-3 shows an example of how to set up the EVM for single-supply operation with a buffered-reference voltage connection. Depending on the application, desirable single-supply buffer operational amplifiers include the TLV9001, TLV9041, TLV9051, and TLV9061.

Figure 5-3 Single-Supply Configuration, Buffered REF Connection

The following connections were made:

+V_S to V+ test point
V+_OPA to OAV+ test point
GND to V– and OAV– test points
V_REF to OAVIN+ test point
Ensure that R17 is not populated
Populate R12, R15, and R16 with a 0-Ω resistor
Populate C10, C11, C15, and C20 with appropriate decoupling capacitors for buffer amplifier
Differential input signal to IN– and IN+ test points
Observe output at OUT test point

Note:

1. C9 and C10 are prepopulated with 0.1-µF power-supply decoupling capacitors. It is not required to remove C9 for proper single-supply operation. Refer to the device data sheet for additional power-supply decoupling information (Table 1-1).

2. A valid input common mode must be present on both inputs of the IA for proper operation.