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.

8.2 Typical Applications

8.2.1 ADS8860 16-Bit, 1MSPS, Single-Ended Input, SAR ADC Driver

Figure 8-1 shows the schematic for the 16-bit, precision, 1MSPS, successive approximation register (SAR),

analog-to-digital converter (ADC). This circuit is used to measure the driving capability of the PGA849 with the

ADS8860 single-ended input ADC.

ADS8860

Single-Ended

SAR ADC

INP

INN

5.3V

AVSS

REF6250

5.0V

Reference

RDIV1

±0.05%

10k

REF6050

5.0V

Reference

1k

OPA192

+

–

RISO

20

RF

2k

5.3V

IN+

IN–

10pF

10pF

15V

100nF

–15V

100nF

DA_IN–

+

OUT

IN+

IN–

DA_IN+

+

PGA849

+

Gain Network

A0

A1

A2

A0

A1

A2

Overvoltage

Protection

Overvoltage

Protection

VS+

DGND

–

–

–

REF

LVDD

VS–

LVSS

5.3V

1µF

REFIN

PGA849

REF Voltage

2.5V

5k

5k

5k

5k

100pF

100nF

CFB

100pF

CFB

100pF

22µF

0.22

CCM

120pF

RFIL

15

CDIFF

1.2nF

RFIL

15

CCM

120pF

22nF

10nF

RDIV2

±0.05%

10k

CF

2200pF

100nF

Figure 8-1. Driving the ADS8860 SAR ADC

PGA849

SBOSAG3 – MARCH 2024

www.ti.com

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