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AD7701AR Datasheet(PDF) 1 Page - Analog Devices |
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AD7701AR Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page REV. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7701 LC2MOS 16-Bit A/D Converter FEATURES Monolithic 16-Bit ADC 0.0015% Linearity Error On-Chip Self-Calibration Circuitry Programmable Low-Pass Filter 0.1 Hz to 10 Hz Corner Frequency 0 V to +2.5 V or 2.5 V Analog Input Range 4 kSPS Output Data Rate Flexible Serial Interface Ultralow Power APPLICATIONS Industrial Process Control Weigh Scales Portable Instrumentation Remote Data Acquisition GENERAL DESCRIPTION The AD7701 is a 16-bit ADC which uses a sigma-delta conver- sion 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 fre- quency 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. CMOS construction insures low power dissipation, and a power down mode reduces the idle power consumption to only 10 µW. PRODUCT HIGHLIGHTS 1. The AD7701 offers 16-bit resolution coupled with outstand- ing 0.0015% accuracy. 2. No missing codes ensures true, usable, 16-bit dynamic range, removing the need for programmable gain and level-setting circuitry. 3. The effects of temperature drift are eliminated by on-chip self-calibration, which removes zero and gain error. External circuits can also be included in the calibration loop to remove system offsets and gain errors. 4. A flexible synchronous/asynchronous interface allows the AD7701 to interface directly to UARTs or to the serial ports of industry-standard microcontrollers. 5. Low operating power consumption and an ultralow power standby mode make the AD7701 ideal for loop-powered remote sensing applications, or battery-powered portable instruments. © Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FUNCTIONAL BLOCK DIAGRAM 5 DGND AVDD DVDD AVSS DVSS SC1 SC2 14 15 7 64 17 AGND AIN VREF 9 10 8 13 CALIBRATION SRAM CALIBRATION MICROCONTROLLER 16-BIT A/D CONVERTER ANALOG MODULATOR CAL BP/UP SLEEP 12 11 20 19 CLOCK GENERATOR SERIAL INTERFACE LOGIC SDATA SCLK 3 2 1 16 18 CLKIN CLKOUT MODE CS DRDY 6-POLE GAUSSIAN LOW-PASS DIGITAL FILTER AD7701 |
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