AD7714YR

Product Summary

The AD7714YR 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. 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 onchip 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 AD7714YR is ideal for use in smart, microcontroller- or DSPbased systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity and channel selection can be configured in software using the serial port. The AD7714YR provides self-calibration, system calibration and background calibration options and also allows the user to read and write the on-chip calibration registers.

Parametrics

AD7714YR absolute maximum ratings: (1)AVDD to AGND: -0.3 V to +7 V; (2)AVDD to DGND: -0.3êV to +7eV; (3)DVDD to AGND: -0.3êV to +7eV; (4)DVDD to DGND: -0.3eV to +7eV; (5)Analog Input Voltage to AGND: -0.3 V to AVDD + 0.3êV; (6)Reference Input Voltage to AGND: -0.3 V to AVDD + 0.3êV; (7)Digital Input Voltage to DGND: -0.3 V to DVDD + 0.3 V; (8)Digital Output Voltage to DGND: -0.3 V to DVDD + 0.3 V; (9)Operating Temperature Range, Commercial (A Version): -40℃ to +85℃; Extended (Y Version): -40℃ to +105℃; (10)Storage Temperature Range: -65℃ to +150℃; (11)Junction Temperature: +150℃; (12)SOIC Package, Power Dissipation: 450 mW; (13)SSOP Package, Power Dissipation: 450 mW; (14)TSSOP Package, Power Dissipation: 450 mW.

Features

AD7714YR features: (1)Charge Balancing ADC; (2)Five-Channel Programmable Gain Front End; (3)Three-Wire Serial Interface; (4)3 V (AD7714-3) or 5 V (AD7714-5) Operation; (5)Low Noise (<150 nV rms); (6)Low Current (350μA typ) with Power-Down (5 μA typ); (7)Low-Pass Filter with Programmable Filter Cutoffs; (8)Ability to Read/Write Calibration Coefficients.

Diagrams