AD7711AR

Product Summary

The AD7711AR is a complete analog front end for low frequency measurement applications. The device accepts low level signals directly from a transducer and outputs a serial digital word. The AD7711AR 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 AD7711AR 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 AD7711AR include RTD Transducers, Process Control, Smart Transmitters and Portable Industrial Instruments.

Parametrics

AD7711AR absolute maximum ratings: (1)AVDD to DVDD: –0.3V to +12V; (2)AVDD to VSS: –0.3V to +12V; (3)AVDD to AGND: –0.3V to +12V; (4)AVDD to DGND: –0.3V to +12V; (5)DVDD to AGND: –0.3V to +6V; (6)DVDD to DGND: –0.3V to +6V; (7)VSS to AGND: +0.3V to –6V; (8)VSS to DGND: +0.3V to –6V; (9)Analog Input Voltage to AGND: VSS–0.3V to AVDD + 0.3V; (10)Reference Input Voltage to AGND: VSS–0.3V to AVDD + 0.3V; (11)REF OUT to AGND: –0.3V to AVDD; (12)Digital Input Voltage to DGND: –0.3V to AVDD + 0.3V; (13)Digital Output Voltage to DGND : –0.3V to DVDD + 0.3V; (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

AD7711AR features: (1)Charge Balancing ADC: 24 Bits No Missing Codes; 60.0015% Nonlinearity; (2)Two-Channel Programmable Gain Front End: Gains from 1 to 128; One Differential Input; One Single-Ended Input; (3)Low-Pass Filter with Programmable Filter Cutoffs; (4)Ability to Read/Write Calibration Coefficients; (5)RTD Excitation Current Sources; (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 (7 mW typ).

Diagrams