SLDS204B October 2014 – June 2020 PGA300
PRODUCTION DATA.
The DAC gain amplifier is a configurable buffer stage following the DAC output. The DAC gain amplifier can be configured to operate in voltage amplification mode for voltage output or current amplification mode for 4-mA to 20-mA applications. In voltage output mode, the DAC gain is set to one of four possible gain settings using the DAC_GAIN[2:0] bits in the OP_STAGE_CTRL register, as shown in Figure 6. In current output mode the gain of the DAC gain amplifier is fixed and cannot be changed.
The final stage of the DAC gain amplifier is connected to PWR and ground, thus providing the ability to drive the VOUT voltage close to the VPWR voltage.
The DAC gain amplifier also offers a COMP pin in order to allow implementing compensation when driving large capacitive loads. See the PGA900 DAC Output Stability application note and additional documentation in the Related Documentation section for details.