JAJSSL2 March 2024 PGA849
ADVANCE INFORMATION
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 design when compared to programmable-gain amplifiers requiring an SPI or other digital interface options for gain changes. Figure 7-1 shows the gain-setting block diagram. Table 7-2 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.
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 |