16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port

The AD7709 is a complete analog front-end for low frequency measurement applications. The AD7709 contains a 16-bit sigma delta ADC with PGA and can be configured as 2 fully-differential input channels or 4 pseudo-differential input channels. Inputs signal ranges from 20mV to 2.56V can be directly converted using the AD7709. These signals can be converted directly from a transducer without the need for signal conditioning. Other on-chip features include three software configurable current sources, switchable reference inputs, low side power switches and a 4-bit digital I/O port.

* 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