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PGA112: Will the PGA112 be suitable for driving the ADS127l01 (24-bit delta sigma adc)

Part Number: PGA112
Other Parts Discussed in Thread: ADS127L01, ADS1282, , THS4551

Hi T.I., 

I have been evaluating the ADS127l01 (24-bit delta sigma adc) for the purpose of conditioning seismic data from a geophone sensor ~10-250 Hz.

The eval board for the ADS127l01 drives the ADC with theTHS4551 differential amplifier. I am aiming for a dynamic range of 120 dB, 20 ENOB.

This adc is being tested for portable, low power instrumentation and the wide band filter option is particularly useful. The cost per unit for the ADS1282 (seismic conditioning ADC with PGA and wideband filter) is too high for the volumes I need, but  my device does require a PGA.

I have a few questions regarding this application:

1. Is the PGA112 a good choice to go directly into the THS4551 and then the ADC? If not, would active filtering with the THS4551 cause a significant improvement?

2. Is there a PGA better suited for my needs? 

3. is there an alternative to using a PGA? eg. an ic that would let me digitally control the signal path to switch between regular precision opamps or precision INAs with static gain? Board space is very important sot his would be a last resort for me.

Thank you,