9 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.

9.1 Application Information

The PGA855 is a monolithic, high-voltage, high bandwidth, precision programmable gain instrumentation

amplifier with fully differential outputs. The PGA855 combines a high-speed current-feedback input stage with an

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

PGA855 is equipped with 8 binary-gain settings, from 0.125 V/V to 16 V/V, using three digital gain-selection pins:

A0, A1, and A2.

The PGA855 is designed to work with applications such as factory automation and control, analog input

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

9.1.1 Linear Operating Input Range

The linear operating input voltage range of the PGA855 input circuitry extends within 2.5 V (maximum) of both

power supplies, and maintains excellent common-mode rejection throughout this range. 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 9-1 to

Figure 9-3.

Max/Min Output Differential Voltage (V)

-25

-20

-15

-10

-5

0

5

10

15

20

25

-15

-12.5

-10

-7.5

-5

-2.5

0

2.5

5

7.5

10

12.5

15

17.5

20

VS =VSOUT= 15V

VS =VSOUT= 5V

VS = VSOUT = ±5

V, ±15 V

VOCM = 0 V

G = 16 V/V

Figure 9-1. Input Common-Mode Voltage vs Output

Voltage at G = 16 V/V

Max/Min Output Differential Voltage (V)

-25

-20

-15

-10

-5

0

5

10

15

20

25

-12.5

-10

-7.5

-5

-2.5

0

2.5

5

7.5

10

12.5

15

17.5

20

VS =VSOUT= 15V

VS =VSOUT= 5V

VS = VSOUT = ±5

V, ±15 V

VOCM = 0 V

G = 1 V/V

Figure 9-2. Input Common-Mode Voltage vs Output

Voltage at G = 1 V/V

PGA855

SBOSAE0B – APRIL 2023 – REVISED SEPTEMBER 2023

www.ti.com

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