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 PGA848 is a monolithic, high-voltage, high-bandwidth, precision programmable gain instrumentation

amplifier with a single-ended output. The PGA848 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

PGA848 is equipped with eight binary-gain settings, from 0.5V/V to 100V/V, using three digital gain-selection

pins: A0, A1, and A2.

The PGA848 is designed for 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 PGA848 input circuitry extends within 3V (maximum) of either

power supply. The device 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 reference input voltage.

The valid common-mode range to enable valid output voltage at no load condition are shown in Figure 8-4 to

Figure 8-3.

Output Voltage (V)

-15

-12

-9

-6

-3

0

3

6

9

12

15

-15

-12

-9

-6

-3

0

3

6

9

12

15

VS = VSOUT = 15V

VS = 15V, VSOUT = 5V

VS = VSOUT = ±15V

VS = ±15V, VSOUT = ±5V

VREF = 0V

G = 0.5V/V

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

Voltage

Output Voltage (V)

-20

-16

-12

-8

-4

0

4

8

12

16

20

-15

-12

-9

-6

-3

0

3

6

9

12

15

VS = VSOUT = 15V

VS = VSOUT = 5V

VS = VSOUT = ±15V

VS = VSOUT = ±5V

VREF = 0V

G = 1V/V

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

Voltage

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PGA848

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