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AD7684 Dataheets PDF



Part Number AD7684
Manufacturers Analog Devices
Logo Analog Devices
Description 16-Bit - 100 kSPS PulSAR Differential ADC
Datasheet AD7684 DatasheetAD7684 Datasheet (PDF)

16-Bit, 100 kSPS PulSAR Differential ADC in MSOP AD7684 www.DataSheet4U.com FEATURES 16-bit resolution with no missing codes Throughput: 100 kSPS INL: ±1 LSB typ, ±3 LSB max True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs Single-supply operation: 2.7 V to 5.5 V Serial interface SPI-®/QSPI-™/MICROWIRE-™/DSP-compatible Power Dissipation : 4 mW @ 5 V, 1.5 mW @ 2.7 V, 150 µW @ 2.7 V/10 kSPS Standby current: 1 nA 8-lead MSOP package APPLICATION DIAGRAM 0.5.

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16-Bit, 100 kSPS PulSAR Differential ADC in MSOP AD7684 www.DataSheet4U.com FEATURES 16-bit resolution with no missing codes Throughput: 100 kSPS INL: ±1 LSB typ, ±3 LSB max True differential analog input range: ±VREF 0 V to VREF with VREF up to VDD on both inputs Single-supply operation: 2.7 V to 5.5 V Serial interface SPI-®/QSPI-™/MICROWIRE-™/DSP-compatible Power Dissipation : 4 mW @ 5 V, 1.5 mW @ 2.7 V, 150 µW @ 2.7 V/10 kSPS Standby current: 1 nA 8-lead MSOP package APPLICATION DIAGRAM 0.5V TO VDD 2.7V TO 5.5V VREF 0 +IN –IN VREF 0 REF VDD DCLOCK 3-WIRE SPI INTERFACE 04302-001 AD7684 GND DOUT CS Figure 1. APPLICATIONS Battery-powered equipment Data acquisition Instrumentation Medical instruments Process control Table 1. MSOP, QFN (LFCSP)/SOT-23, 16-Bit PulSAR ADCs Type True Differential Pseudo Differential/Unipolar Unipolar 100 kSPS AD7684 AD7683 AD7680 250 kSPS AD7687 AD7685 AD7694 500 kSPS AD7688 AD7686 GENERAL DESCRIPTION The AD7684 is a 16-bit, charge redistribution, successive approximation, PulSAR™ analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.7 V to 5.5 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a serial, SPI-compatible interface port. The part also contains a low noise, wide bandwidth, short aperture delay, track-and-hold circuit. On the CS falling edge, it samples the voltage difference between +IN and –IN pins. The reference voltage, REF, is applied externally and can be set up to the supply voltage. Its power scales linearly with throughput. The AD7684 is housed in an 8-lead MSOP package, with an operating temperature specified from −40°C to +85°C. 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. Specifications subject to change without notice. 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. AD7684 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Specifications....................................................................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Terminology ...................................................................................... 8 Typical Performance Characteristics ............................................. 9 Application Information................................................................ 12 Circuit Information.................................................................... 12 Converter Operation.................................................................. 12 Transfer Functions...................................................................... 12 www.DataSheet4U.com Typical Connection Diagram ................................................... 13 Analog Input ............................................................................... 13 Driver Amplifier Choice............................................................ 13 Voltage Reference Input ............................................................ 14 Power Supply............................................................................... 14 Digital Interface.......................................................................... 14 Layout .......................................................................................... 14 Evaluating the AD7684’s Performance .................................... 14 Outline Dimensions ....................................................................... 15 Ordering Guide .......................................................................... 15 REVISION HISTORY 10/04—Initial Version: Revision 0 Rev. 0 | Page 2 of 16 www.DataSheet4U.com AD7684 SPECIFICATIONS VDD = 2.7 V to 5.5 V; VREF = VDD; TA = –40°C to +85°C, unless otherwise noted. Table 2. Parameter RESOLUTION ANALOG INPUT Voltage Range Absolute Input Voltage Analog Input CMRR Leakage Current at 25°C Input Impedance THROUGHPUT SPEED Complete Cycle Throughput Rate DCLOCK Frequency REFERENCE Voltage Range Load Current DIGITAL INPUTS Logic Levels VIL VIH IIL IIH Input Capacitance DIGITAL OUTPUTS Data Format VOH VOL POWER SUPPLIES VDD VDD Range1 Operating Current Conditions Min 16 −VREF −0.1 Typ Max Unit Bits V V dB nA +IN − (–IN) +IN, –IN fI.


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