AD7701ARS

Product Summary

The AD7701ARS is an A/D Converter. The AD7701ARS is a 16-bit ADC which uses a sigma-delta conversion technique. The analog input is continuously sampled by an analog modulator whose mean output duty cycle is proportional to the input signal. The modulator output is processed by an on-chip digital filter with a six-pole Gaussian response, which updates the output data register with 16-bit binary words at word rates up to 4 kHz. The sampling rate, filter corner frequency and output word rate are set by a master clock input that may be supplied externally, or by a crystal-controlled on chip clock oscillator. The inherent linearity of the ADC is excellent, and endpoint accuracy is ensured by self-calibration of zero and full scale which may be initiated at any time. The self-calibration scheme can also be extended to null system offset and gain errors in the input channel. The output data is accessed through a flexible serial port, which has an asynchronous mode compatible with UARTs and two synchronous modes suitable for interfacing to shift registers or the serial ports of industry-standard microcontrollers. The applications of the AD7701ARS include Industrial Process Control, Weigh Scales, Portable Instrumentation and Remote Data Acquisition.

Parametrics

AD7701ARS absolute maximum ratings: (1)DVDD to AGND: –0.3 V to +6 V; (2)DVDD to AVDD: –0.3 V to +0.3 V; (3)DVSS to AGND: +0.3 V to –6 V; (4)AVDD to AGND: –0.3 V to +6 V; (5)AVSS to AGND: +0.3 V to –6 V; (6)AGND to DGND: –0.3 V to +0.3 V; (7)Digital Input Voltage to DGND: –0.3 V to DVDD +0.3 V; (8)Analog Input Voltage to AGND: AVSS – 0.3 V to AVDD + 0.3 V; (9)Input Current to Any Pin Except Supplies: ±10 mA; (10)Operating Temperature Range: –55℃ to +125℃; (11)Storage Temperature Range: –65℃ to +150℃; (12)Lead Temperature (Soldering, 10 secs): +300℃; (13)Power Dissipation (Any Package) to +75℃: 450 mW; (14)Derates above +75℃ by: 10 mW/℃.

Features

AD7701ARS features: (1)Monolithic 16-Bit ADC; (2)0.0015% Linearity Error; (3)On-Chip Self-Calibration Circuitry; (4)Programmable Low-Pass Filter 0.1 Hz to 10 Hz Corner Frequency; (5)0 V to +2.5 V or 62.5 V Analog Input Range; (6)4 kSPS Output Data Rate; (7)Flexible Serial Interface; (8)Ultralow Power.

Diagrams