Datasheet

SLDU010
TI CONFIDENTIAL – NDA Restrictions
Page 15 of 50
4 PGA400-Q1 VOUT1/VOUT2 Output Circuitry
There are two DAC outputs on the PGA400-Q1, VOUT1 and VOUT2, which serve as the main
output for the PGA400-Q1 device. Simple circuitry including output filtering and ADC monitoring
of the DAC outputs are present on the EVM. The VOUT1 output also has circuitry that is used
for the OWI activation as well as the OWI communication.
Figure 10. Simplified Block Diagram of PGA400-Q1 Output
Circuitry
4.1 Output Filtering for VOUT1 and VOUT2
Both the VOUT1 and VOUT2 outputs on the PGA400-Q1 have simple output filtering comprised
of a resistive pull-up and a capacitor to GND. The capacitor is used to form a low-pass filter with
the output impedance of the VOUT1/VOUT2 DACs. The resistive pull-up is primarily used to fill
the requirements for an external pull-up in OWI mode. Shown below are the output filters on the
VOUT1/VOUT2 pins.