8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The PGA849 is a monolithic, high-voltage, high-bandwidth, precision programmable gain instrumentation

amplifier with a single-ended output. The PGA849 combines a high-speed current-feedback input stage with

an internally matched gain resistor network, followed by a four-resistor, differential amplifier output stage. The

PGA849 is equipped with eight binary-gain settings, from 0.125V/V to 16V/V, using three digital gain-selection

pins: A0, A1, and A2.

The PGA849 is designed to work with applications such as factory automation and control, analog input

modules, data acquisition, test and measurement, and semiconductor test.

8.1.1 Linear Operating Input Range

The linear operating input voltage range of the PGA849 input circuitry extends within 3V (maximum) of the

negative power supply to 2.5V (maximum) of the positive power supply, and maintains excellent common-mode

rejection throughout this range at all temperatures. The linear operating input common-mode range is a function

of the input common-mode voltage, input differential voltage, gain, and output common-mode voltage.

The valid common-mode range to enable valid output voltage at no load condition are shown in Figure 8-1 to

Figure 8-4.

VREF = 0V

G = 0.125V/V

Figure 8-1. Input Common-Mode Voltage vs Output

Voltage

VREF = 0V

G = 1V/V

Figure 8-2. Input Common-Mode Voltage vs Output

Voltage

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PGA849

SBOSAG3A – MARCH 2024 – REVISED DECEMBER 2024

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Product Folder Links: PGA849