7.3 Feature Description

7.3.1 Gain Control

The PGA849 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 that is 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. PGA849 Gain Setting Block Diagram

Table 7-1. Gain Options

A2:A0

GAIN

000

0.125

001

0.25

010

0.5

011

1

100

2

101

4

110

8

111

16

PGA849

SBOSAG3A – MARCH 2024 – REVISED DECEMBER 2024

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