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AD7703AR Folha de dados(PDF) 1 Page - Analog Devices |
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AD7703AR Folha de dados(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 LC2MOS 20-Bit A/D Converter AD7703 © 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 FEATURES Monolithic 20-Bit ADC 0.0003% Linearity Error 20-Bit No Missed Codes On-Chip Self-Calibration Circuitry Programmable Low-Pass Filter 0.1 Hz to 10 Hz Corner Frequency 0 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 FUNCTIONAL BLOCK DIAGRAM 5 DGND AVDD DVDD AVSS DVSS SC1 SC2 14 15 7 64 17 AGND AIN VREF 10 8 13 CALIBRATION SRAM CALIBRATION MICROCONTROLLER CAL BP/UP SLEEP 20 19 CLOCK GENERATOR SERIAL INTERFACE LOGIC SDATA SCLK 3 2 1 16 18 CLKIN CLKOUT MODE CS DRDY AD7703 9 ANALOG MODULATOR 12 11 6-POLE GAUSSIAN LOW-PASS DIGITAL FILTER 20-BIT CHARGE BALANCE A/D CONVERTER PRODUCT HIGHLIGHTS 1. The AD7703 offers 20-bit resolution coupled with outstanding 0.0003% accuracy. 2. No missing codes ensures true, usable, 20-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 synchronization allows the AD7703 to interface directly to the serial ports of industry standard microcontrollers and DSP processors. 5. Low operating power consumption and an ultralow power standby mode make the AD7703 ideal for loop powered remote sensing applications, or battery-powered portable instruments. GENERAL DESCRIPTION The AD7703 is a 20-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 20-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 an on-chip gate 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 serial port, which has two synchronous modes suitable for interfacing to shift registers or the serial ports of industry standard microcontrollers. CMOS construction ensures low power dissipation, and a power down mode reduces the idle power consumption to only 10 W. |
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