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AD7783BRU Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7783BRU Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 12 page REV. B 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved. AD7783 Read-Only, Pin Configured 24-Bit - ADC with Excitation Current Sources FEATURES Single-Channel, 24-Bit - ADC Pin Configurable (No Programmable Registers) ISOURCE Select™ Pin Programmable Input Ranges ( ±2.56 V or ±160 mV) Fixed 19.79 Hz Update Rate Simultaneous 50 Hz and 60 Hz Rejection 24-Bit No Missing Codes 18.5-Bit p-p Resolution ( ±2.56 V Range) 16.5-Bit p-p Resolution ( ±160 mV Range) INTERFACE Master or Slave Mode of Operation Slave Mode 3-Wire Serial SPI®, QSPI™, MICROWIRE™, and DSP-Compatible Schmitt Trigger on SCLK POWER Specified for Single 3 V and 5 V Operation Normal: 1.3 mA @ 3 V Power-Down: 9 A ON-CHIP FUNCTIONS Rail-to-Rail Input Buffer and PGA APPLICATIONS Sensor Measurement Industrial Process Control Temperature Measurement Pressure Measurement Weigh Scales Portable Instrumentation GENERAL DESCRIPTION The AD7783 is a complete analog front end for low frequency measurement applications. The 24-bit sigma-delta ADC con- tains one fully differential input channel that can be configured with a gain of 1 or 16 allowing full-scale input signal ranges of ±2.56 V or ±160 mV from a +2.5 V differential reference input. It also contains two 200 mA integrated current sources. The AD7783 has an extremely simple, read-only digital inter- face that can be operated in master mode or slave mode. There are no on-chip registers to be programmed. The input signal range and current source selection are configured using two external pins. FUNCTIONAL BLOCK DIAGRAM OSCILLATOR AND PLL DOUT/ RDY SCLK MODE XTAL1 XTAL2 SERIAL INTERFACE AND CONTROL LOGIC CS REFIN(–) REFIN(+) 24-BIT - ADC RANGE AD7783 VDD GND BUF PGA MUX AIN(+) AIN(–) IOUT1 VDD IEXC1 200 A IEXC2 200 A IOUT2 IPIN BASIC CONNECTION DIAGRAM AD7783 REFIN(+) REFIN(–) AIN(–) AIN(+) IOUT2 IOUT1 XTAL1 VDD DOUT/ RDY CS SCLK XTAL2 GND REFERENCE INPUT CURRENT SOURCES ANALOG INPUT POWER SUPPLY 32.768kHz CRYSTAL DIGITAL INTERFACE The device operates from a 32.768 kHz crystal with an on-chip PLL generating the required internal operating frequency. The output data rate from the part is fixed via the master clock at 19.79 Hz and provides simultaneous 50 Hz and 60 Hz rejection at this update rate. At this update rate, 18-bit p-p resolution can be obtained. The part operates from a single 3 V or 5 V supply. When oper- ating from 3 V supplies, the power dissipation for the part is 3.9 mW. The AD7783 is available in a 16-lead TSSOP. Another part in the AD778x family is the AD7782. It is similar to the AD7783 except it has no integrated current sources and two differential input channels. |
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