Tool/software:
The input signals can vary from ±10V, ±5V, ±1V, and ±500mV, with a frequency range of 0-30kHz.
The given ADC's reference voltage (VREF) is 4.096V and its requirement for differential inputs（inputs range is
-4.096~+4.096）, Is the PGA855 an appropriate choice? or it has a better choice.
Hi Henry,
The PGA855 is a new device offering outstanding DC accuracy with low offset and very good AC performance (low noise and low distortion) with a bandwidth of 10-MHz across all gains. The PGA855 offers binary attenuations and gains from 1/8, 1/4, 1/2, 1 , 2, 4, 8, 16 with fully-differential inputs and outputs, so it will meet all your requirements.
An alternative programmable gain amplifier is the PGA280 or PGA281, also offering fully-differential outputs and binary gain steps: ⅛ V/V to 128V/V. The PGA280 and PGA281 offer very low offset and offset/drift. However, the PGA280 and PGA281 device bandwidth across all gains is limited to approximately ~15-kHz depending on the gain settings. See figure below of the "Small Signal Gain vs Frequency".
If you have a strict requirement for >30kHz bandwidth, and fully-differential output, the PGA855 will be the best fit meeting your requirements.
Thank you and kind Regards,
Luis
