TM 16-Bit 100 kSPS PulSAR Unipolar ADC with Reference AD7651 FEATURES FUNCTIONAL BLOCK DIAGRAM Throughput: 100 kSPS REFBUFIN REF REFGND DVDD DGND 16-bit resolution OVDD AGND AD7651 Analog input voltage range: 0 V to 2.5 V AVDD SERIAL OGND REF No pipeline delay PORT Parallel and serial 5 V/3 V interface 16 IN SWITCHED DATA 15:0 TM TM CAP DAC SPI/QSPI /MICROWIRE /DSP compatible INGND BUSY PARALLEL Single 5 V supply operation PDREF INTERFACE RD PDBUF Power dissipation CLOCK CS PD 16 mW typ, 160 W 1 kSPS without REF CONTROL LOGIC AND SER/PA R RESET CALIBRATION CIRCUITRY 38 mW typ with REF OB/2C 48-lead LQFP and 48-lead LFCSP packages BYTESWAP Pin-to-pin compatible with PulSAR ADCs CNVST 02964-0-001 APPLICATIONS Figure 1. Functional Block Diagram Data acquisition Table 1. PulSAR Selection Instrumentation 800 Digital signal processing Type/kSPS 100250 500570 1000 Spectrum analysis Pseudo- AD7651 AD7650/AD7652 AD7653 Medical instruments Differential AD7660/AD7661 AD7664/AD7666 AD7667 Battery-powered systems True Bipolar AD7663 AD7665 AD7671 Process control True AD7675 AD7676 AD7677 Differential GENERAL DESCRIPTION 18-Bit AD7678 AD7679 AD7674 The AD7651 is a 16-bit, 100 kSPS, charge redistribution SAR Multichannel/ AD7654 analog-to-digital converter that operates from a single 5 V Simultaneous AD7655 power supply. The part contains a high speed 16-bit sampling ADC, an internal conversion clock, internal reference, error PRODUCT HIGHLIGHTS correction circuits, and both serial and parallel system inter- 1. Fast Throughput. face ports. The AD7651 is a 100 kSPS, charge redistribution, 16-bit SAR ADC with internal error correction circuitry. The AD7651 is fabricated using Analog Devices high perform- ance, 0.6 micron CMOS process, with correspondingly low cost, 2. Internal Reference. and is available in a 48-lead LQFP and a tiny 48-lead LFCSP The AD7651 has an internal reference with a typical with operation specified from 40C to +85C. temperature drift of 7 ppm/C. 3. Single-Supply Operation. The AD7651 operates from a single 5 V supply. Its power dissipation decreases with throughput. 4. Serial or Parallel Interface. Versatile parallel or 2-wire serial interface arrangement is compatible with both 3 V and 5 V logic. Rev. 0 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. Trademarks and Fax: 781.326.8703 2003 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective owners. AD7651 TABLE OF CONTENTS Specifications..................................................................................... 3 Parallel Interface......................................................................... 20 Timing Specifications....................................................................... 5 Serial Interface ............................................................................ 20 Absolute Maximum Ratings............................................................ 7 Master Serial Interface............................................................... 21 Pin Configuration and Function Descriptions............................. 8 Slave Serial Interface .................................................................. 22 Definitions of Specifications ......................................................... 11 Microprocessor Interfacing....................................................... 24 Typical Performance Characteristics ........................................... 12 Application Hints............................................................................ 25 Circuit Information ........................................................................ 15 Bipolar and Wider Input Ranges .............................................. 25 Converter Operation.................................................................. 15 Layout .......................................................................................... 25 Typical Connection Diagram.................................................... 17 Evaluating the AD7651s Performance .................................... 25 Power Dissipation versus Throughput .................................... 19 Outline Dimensions ....................................................................... 26 Conversion Control.................................................................... 19 Ordering Guide........................................................................... 26 Digital Interface .......................................................................... 20 REVISION HISTORY Revision 0, Initial Version. 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