16-Bit, 100 kSPS PulSAR, Differential ADC in MSOP AD7684 FEATURES APPLICATION DIAGRAM 0.5V TO VDD 2.7V TO 5.5V 16-bit resolution with no missing codes Throughput: 100 kSPS V REF INL: 1 LSB typical, 3 LSB maximum 0 REF VDD True differential analog input range: V REF +IN DCLOCK 0 V to V with V up to VDD on both inputs REF REF 3-WIRE SPI AD7684 D IN OUT INTERFACE Single-supply operation: 2.7 V to 5.5 V CS V GND REF Serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible 0 Power dissipation Figure 1. 4 mW 5 V 1.5 mW 2.7 V Table 1. MSOP, QFN (LFCSP)/SOT-23 150 W 2.7 V/10 kSPS 14-/16-/18-Bit PulSAR ADC Standby current: 1 nA 400 kSPS 8-lead MSOP package 100 250 to 1000 ADC Type kSPS kSPS 500 kSPS kSPS Driver 18-Bit True AD7691 AD7690 AD7982 ADA4941 APPLICATIONS Differential AD7984 ADA4841 16-Bit True AD7684 AD7687 AD7688 ADA4941 Battery-powered equipment Differential AD7693 ADA4841 Data acquisition 16-Bit Pseudo AD7680 AD7685 AD7686 AD7980 ADA4841 Instrumentation Differential AD7683 AD7694 Medical instruments 14-Bit Pseudo AD7940 AD7942 AD7946 ADA4841 Process control Differential GENERAL DESCRIPTION The AD7684 is a 16-bit, charge redistribution, successive On the CS falling edge, it samples the voltage difference approximation, PulSAR analog-to-digital converter (ADC) between +IN and IN pins. The reference voltage, REF, is that operates from a single power supply, VDD, between 2.7 V applied externally and can be set up to the supply voltage. Its to 5.5 V. It contains a low power, high speed, 16-bit sampling power scales linearly with throughput. ADC with no missing codes, an internal conversion clock, and a The AD7684 is housed in an 8-lead MSOP, with an operating serial, SPI-compatible interface port. The part also contains a low temperature specified from 40C to +85C. noise, wide bandwidth, short aperture delay, track-and-hold circuit. Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20042007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 04302-001AD7684 TABLE OF CONTENTS Features .............................................................................................. 1 Converter Operation.................................................................. 12 Applications....................................................................................... 1 Transfer Functions ..................................................................... 12 Application Diagram........................................................................ 1 Typical Connection Diagram ................................................... 13 General Description ......................................................................... 1 Analog Inputs ............................................................................. 13 Revision History ............................................................................... 2 Driver Amplifier Choice ........................................................... 13 Specifications..................................................................................... 3 Voltage Reference Input ............................................................ 14 Timing Specifications .................................................................. 5 Power Supply............................................................................... 14 Absolute Maximum Ratings............................................................ 6 Digital Interface.......................................................................... 14 ESD Caution.................................................................................. 6 Layout .......................................................................................... 14 Pin Configuration and Function Descriptions............................. 7 Evaluating the Performance of the AD7684............................... 14 Terminology ...................................................................................... 8 Outline Dimensions ....................................................................... 15 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 15 Application Information................................................................ 12 Circuit Information.................................................................... 12 REVISION HISTORY 10/07Rev. 0 to Rev. A 10/04 Revision 0: Initial Version Changes to Table 1............................................................................ 1 Changes to Table 2............................................................................ 3 Changes to Layout ............................................................................ 5 Changes to Table 6 and Layout ....................................................... 6 Changes to Table 7............................................................................ 7 Changes to Figure 15 Caption....................................................... 10 Changes to Figure 21...................................................................... 12 Changes to Figure 22 and Analog Inputs Section ...................... 13 Changes to Table 9, Digital Interface Section, and Evaluating the Performance of the AD7684 Section..................................... 14 Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 15 Rev. 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