16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port Features: 16-Bit Σ-Δ ADC Simultaneous 50 Hz and 60 Hz Rejection at 20 Hz Update Rate VREF Select™ Allows Absolute and Ratiometric Measurement Capability Programmable Gain Front End ISOURCE Select™ 16-Bit No Missing Codes 13-Bit p-p Resolution @ 20 Hz, 20 mV Range 16-Bit p-p Resolution @ 20 Hz, 2.56 V Range