The AD7798/AD7799 are low power, low noise, complete analog front ends for high precision measurement applications。 The AD7798/AD7799 contains a low noise, 16-/24-bit ∑-Δ ADC with three differential analog inputs。The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC。With a gain setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.。