The PGIA AD8253 datasheet showed noise performance:
Voltage offset RTI Vos +-150+900/G uV.
Voltage nose 0.1~10Hz,RTI,G=1, 2.5uVp-p.
Then I tested AC performance by 6.5 Digital MultiMeter(HP-3304A), which noise performance showed 4.03mV DC offset and 2.6mV AC ripple. The real noise seems huge than specification.
Refer to my testing schematic as blow. Any comments for this issue?