AD7712ARZ

Product Summary

The AD7712ARZ is a complete analog front end for low frequency measurement applications. The device has two analog input channels and accepts either low level signals directly from a transducer or high level signals, and outputs a serial digital word. The AD7712ARZ employs a sigma-delta conversion technique to realize up to 24 bits of no missing codes performance. The low level input signal is applied to a proprietary programmable gain front end based around an analog modulator. The high level analog input is attenuated before being applied to the same modulator. The AD7712ARZ 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. The applications of the AD7712ARZ inlcude Process Control, Smart Transmitters and Portable Industrial Instruments.

Parametrics

AD7712ARZ 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℃; (15)Extended (S Version): –55 to +125℃; (16)Storage Temperature Range: –65°C to +150℃; (17)Lead Temperature (Soldering, 10 secs): 300℃; (18)Power Dissipation (Any Package) to 75℃: 450 mW.

Features

AD7712ARZ features: (1)Charge Balancing ADC; (2)24 Bits No Missing Codes; (3)±0.0015% Nonlinearity; (4)High Level and Low Level Analog Input Channels; (5)Programmable Gain for Both Inputs; (6)Gains from 1 to 128; (7)Differential Input for Low Level Channel; (8)Low-Pass Filter with Programmable Filter Cutoffs; (9)Ability to Read/Write Calibration Coefficients; (10)Bidirectional Microcontroller Serial Interface; (11)Internal/External Reference Option; (12)Single- or Dual-Supply Operation; (13)Low Power (25 mW typ) with Power-Down Mode (100 μW typ).

Diagrams