GENERAL DESCRIPTION

The AD7710 is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a strain gage or 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 on-chip 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.

FEATURES

Charge Balancing ADC

24 Bits, No Missing Codes

±
0.0015 Nonlinearity

2-Channel Programmable Gain Front End

Gains from 1 to 128

Differential Inputs

Low-Pass Filter with Programmable Filter Cutoffs

Ability to Read/Write Calibration Coefficients

Bidirectional Microcontroller Serial Interface

Internal/External Reference Option

Single- or Dual-Supply Operation

Low Power (25 mW Typ) with Power-Down Mode

(7 mW Typ)

APPLICATIONS

Weigh Scales

Thermocouples

Process Control

Smart Transmitters

Chromatography