7.3 Feature Description

7.3.1 Gain Control

The PGA848 uses three pins to set the amplifier gain. These gain-select pins are set with respect to DGND.

This configuration simplifies the design when compared to programmable-gain amplifiers requiring a SPI or other

digital interface options for gain changes. Figure 7-1 shows the gain-setting block diagram. Table 7-1 lists the

gain options. Any gain-select pin not driven by an external source is automatically biased at DGND using internal

pulldown options.

Gain Decoder

A2

A1

A0

D

GND

Figure 7-1. PGA848 Gain Setting Block Diagram

Table 7-1. Gain Options

A2:A0

GAIN

000

0.5

001

1

010

2

011

5

100

10

101

20

110

50

111

100

PGA848

SBOSAN4 – AUGUST 2025

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