AD7712AR

Product Summary

The AD7712AR is a complete analog front end for low frequency measurement applications. The AD7712AR has two analog input channels and accepts either low level signals directly from a transducer or high level (±4 × VREF) signals 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 first notch of this digital filter AD7712AR can be programmed via the on-chip control register allowing adjustment of the filter cutoff and settling time. The applications of the AD7712AR include Process Control, Smart Transmitters and Portable Industrial Instruments.

Parametrics

AD7712AR absolute maximum ratings: (1)AVDD to DVDD: –0.3 V to +12 V; (2)AVDD to VSS:–0.3 V to +12 V; (3)AVDD to AGND: –0.3 V to +12 V; (4)AVDD to DGND: –0.3 V to +12 V; (5)DVDD to AGND: –0.3 V to +6 V; (6)DVDD to DGND: –0.3 V to +6 V; (7)VSS to AGND: +0.3 V to –6 V; (8)VSS to DGND: +0.3 V to –6 V; (9)AIN1 Input Voltage to AGND: VSS – 0.3 V to AVDD + 0.3 V; (10)Reference Input Voltage to AGND: VSS – 0.3 V to AVDD + 0.3 V; (11)REF OUT to AGND: –0.3 V to AVDD; (12)Digital Input Voltage to DGND: –0.3 V to AVDD + 0.3 V; (13)Digital Output Voltage to DGND: –0.3 V to DVDD + 0.3 V; (14)Operating Temperature Range, Commercial (A Version): –40℃ to +85℃; Extended (S Version): –55℃ to +125℃; (15)Storage Temperature Range: –65℃ to +150℃; (16)Lead Temperature (Soldering, 10 secs): +300℃; (17)Power Dissipation (Any Package) to +75℃: 450 mW.

Features

AD7712AR features: (1)Charge Balancing ADC: 24 Bits No Missing Codes; ±0.0015% Nonlinearity; (2)High Level and Low Level Analog Input Channels; (3)Programmable Gain for Both Inputs: Gains from 1 to 128; Differential Input for Low Level Channel; (4)Low-Pass Filter with Programmable Filter Cutoffs; (5)Ability to Read/Write Calibration Coefficients; (6)Bidirectional Microcontroller Serial Interface; (7)Internal/External Reference Option; (8)Single or Dual Supply Operation; (9)Low Power (25 mW typ) with Power-Down Mode (100 μW typ).

Diagrams