AD7714YRUZ

Product Summary

The AD7714YRUZ is a complete analog front end for low-frequency measurement applications. The AD7714YRUZ accepts low level signals directly from a transducer and outputs a serial digital word. The AD7714YRUZ 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. Applications are (1)portable industrial instruments; (2)portable weigh scales; (3)loop-powered systems; (4)pressure transducer.

Parametrics

AD7714YRUZ absolute maximum ratings: (1)AVDD to AGND: –0.3 V to +7 V; (2)AVDD to DGND: –0.3ÊV to +7ÊV; (3)DVDD to AGND: –0.3ÊV to +7ÊV; (4)DVDD to DGND: –0.3ÊV to +7ÊV; (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°C to +85°C, Extended (Y Version): –40°C to +105°C; (10)Storage Temperature Range: –65°C to +150°C; (11)Junction Temperature: +150°C; (12)Plastic DIP Package, Power Dissipation: 450 mW; (13)Lead Temperature (Soldering, 10 sec): +260°C; (14)SOIC Package, Power Dissipation: 450 mW; (15)Lead Temperature, Soldering Vapor Phase (60 sec): +215°C, Infrared (15 sec): +220°C.

Features

AD7714YRUZ features: (1)Charge Balancing ADC 24 Bits No Missing Codes, 0.0015% Nonlinearity; (2)Five-Channel Programmable Gain Front End: Gains from 1 to 128, Can Be Configured as Three Fully Differential, Inputs or Five Pseudo-Differential Inputs; (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 (350&Ecirc;mA typ)with Power-Down (5 mA typ); (7)AD7714Y Grade:; (8)+2.7 V to 3.3 V or +4.75 V to +5.25 V Operation; (9)0.0010% Linearity Error; (10)–40°C to +105°C Temperature Range; (11)Schmitt Trigger on SCLK and DIN; (12)Low Current (226&Ecirc;mA typ)with Power-Down (4 mA typ); (13)Lower Power Dissipation than Standard AD7714; (14)Available in 24-Lead TSSOP Package; (15)Low-Pass Filter with Programmable Filter Cutoffs; (16)Ability to Read/Write Calibration Coefficients.

Diagrams