"The AD7714 is a complete analog front end for low-frequency measurement applications. The device accepts low level signals
directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 24
bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an
analog modulator. The modulator output is processed by an onchip digital filter. The first notch of this digital filter can be
programmed via the on-chip control register allowing adjustment of the filter cutoff and settling time."
"The programmable gain channels allow the AD7714 to accept input signals directly from a strain gage or transducer
removing a considerable amount of signal conditioning."
"AIN Input Current 1nA MAX"
"AIN Sampling Capacitance 7pF MAX"
Not much to improve on there.