16-Bit 1 MSPS PulSAR Unipolar ADC with Reference AD7667 FUNCTIONAL BLOCK DIAGRAM FEATURES REFBUFIN REF REFGND DVDD DGND 2.5 V internal reference: typical drift 3 ppm/C Guaranteed max drift 15 ppm/C OVDD AGND AD7667 Throughput: AVDD OGND SERIAL REF 1 MSPS (Warp mode) PORT 800 kSPS (Normal mode) 16 IN SWITCHED DATA 15:0 666 kSPS (Impulse mode) CAP DAC INGND BUSY INL: 2.0 LSB max (0.0038% of full scale) PARALLEL PDREF INTERFACE RD 16-bit resolution with no missing codes PDBUF CLOCK CS S/(N+D): 88 dB min 20 kHz PD CONTROL LOGIC AND SER/PAR THD: 96 dB max 20 kHz RESET CALIBRATION CIRCUITRY OB/2C Analog input voltage range: 0 V to 2.5 V BYTESWAP No pipeline delay WARP IMPULSE CNVST Parallel and serial 5 V/3 V interface TM TM Figure 1. SPI/QSPI /MICROWIRE /DSP compatible Single 5 V supply operation Table 1. PulSAR Selection Power dissipation 800 87 mW typ 666 kSPS, 130 W 1 kSPS without REF Type/kSPS 100250 500570 1000 133 mW typ 1 MSPS with REF Pseudo- AD7651 AD7650/AD7652 AD7653 48-lead LQFP and 48-lead LFCSP packages Differential AD7660/AD7661 AD7664/AD7666 AD7667 Pin-to-pin compatible with AD7671, AD7677 True Bipolar AD7663 AD7665 AD7671 True AD7675 AD7676 AD7677 APPLICATIONS Differential Data acquisition 18-Bit AD7678 AD7679 AD7674 Medical instruments Multichannel/ AD7654 Digital signal processing Simultaneous AD7655 Battery-powered systems Process control PRODUCT HIGHLIGHTS 1. Fast Throughput. GENERAL DESCRIPTION The AD7667 is a 1 MSPS, charge redistribution, 16-bit SAR ADC with internal error correction circuitry. The AD7667 is a 16-bit, 1 MSPS, charge redistribution SAR analog-to-digital converter that operates from a single 5 V 2. Superior INL. power supply. The part contains a high speed 16-bit sampling The AD7667 has a maximum integral nonlinearity of ADC, an internal conversion clock, internal reference, error 2.0 LSBs with no missing 16-bit codes. correction circuits, and both serial and parallel system inter- 3. Internal Reference. face ports. It features a very high sampling rate mode (Warp), a The AD7667 has an internal reference with a typical fast mode (Normal) for asynchronous applications, and a temperature drift of 3 ppm/C. reduced power mode (Impulse) for low power applications 4. Single-Supply Operation. where power is scaled with the throughput. The AD7667 is The AD7667 operates from a single 5 V supply. In Impulse hardware factory-calibrated and comprehensively tested to mode, its power dissipation decreases with throughput. ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD) in addition to the more 5. Serial or Parallel Interface. traditional dc parameters of gain, offset, and linearity. Operation Versatile parallel or 2-wire serial interface arrangement is is specified from 40C to +85C. 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 registered trademarks are the property of their respective owners. Fax: 781.326.8703 2004 Analog Devices, Inc. All rights reserved. 03035-0-001AD7667 TABLE OF CONTENTS Specifications..................................................................................... 3 Digital Interface.......................................................................... 22 Timing Specifications....................................................................... 5 Parallel Interface......................................................................... 22 Absolute Maximum Ratings............................................................ 7 Serial Interface ............................................................................ 22 ESD Caution.................................................................................. 7 Master Serial Interface............................................................... 23 Pin Configuration and Function Descriptions............................. 8 Slave Serial Interface .................................................................. 24 Definitions of Specifications ......................................................... 11 Microprocessor Interfacing....................................................... 26 Typical Performance Characteristics ........................................... 12 Application Hints ........................................................................... 27 Circuit Information........................................................................ 16 Bipolar and Wider Input Ranges.............................................. 27 Converter Operation.................................................................. 16 Layout .......................................................................................... 27 Typical Connection Diagram ................................................... 18 Evaluating the AD7667s Performance .................................... 27 Power Dissipation versus Throughput .................................... 20 Outline Dimensions ....................................................................... 28 Conversion Control.................................................................... 21 Ordering Guide .......................................................................... 28 REVISION HISTORY Revision 0: Initial Version. 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