Other Parts Discussed in Thread: OPA2625, , OPA625, THS4551, ADS8329, ADS9110, OPA2328, OPA862, THP210, OPA320, THS4561, LM7705
A quick question on the ADC input driver type for ADS8910B. In datasheet page 59, the typical application with differential input signal and opa2625 drivers. Unfortunately, my signal inputs are single ended (0V-4V roughly). In the design, I'm thinking to use one opa625 or similar unity gain amp to drive the 2.2 ohm resistor and 10nF cap to ADC positive input and simply ground the negative input to signal ground, instead of using the balanced two opa2625 input drivers.
Other than utilizing half of the ADC dynamic range (0V to Vref) and double LSB sizes, comparing with a single ended input ADC, is there any other concerns that could potentially impacting this ADS8910B performance?
I did see that on page 61, single ended can be applied to THS4551 inputs, but it seems like an over kill, the input signal are <300kHz and no need to generate Vocm if only drive the positive input.
Another reason to pick ADS8910B is the option to upgrade to ADS9110 with some layout change. I did not find other single ended input ADC with extended family (only ADS8329 with no upgrade options).
Any comments or suggestions are greatly appreciated.