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AD7264 Dataheets PDF



Part Number AD7264
Manufacturers Analog Devices
Logo Analog Devices
Description Simultaneous Sampling SAR ADC
Datasheet AD7264 DatasheetAD7264 Datasheet (PDF)

Data Sheet 1 MSPS, 14-Bit, Simultaneous Sampling SAR ADC with PGA and Four Comparators AD7264 FEATURES Dual, simultaneous sampling, 14-bit, 2-channel ADC True differential analog inputs Programmable gain stage: ×1, ×2, ×3, ×4, ×6, ×8, ×12, ×16, ×24, ×32, ×48, ×64, ×96, ×128 Throughput rate per ADC 1 MSPS for AD7264 Analog input impedance: >1 GΩ Wide input bandwidth −3 dB bandwidth: 1.7 MHz at gain = 2 4 on-chip comparators SNR: 78 dB typical at gain = 2, 71 dB typical at gain = 32 Device offse.

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Data Sheet 1 MSPS, 14-Bit, Simultaneous Sampling SAR ADC with PGA and Four Comparators AD7264 FEATURES Dual, simultaneous sampling, 14-bit, 2-channel ADC True differential analog inputs Programmable gain stage: ×1, ×2, ×3, ×4, ×6, ×8, ×12, ×16, ×24, ×32, ×48, ×64, ×96, ×128 Throughput rate per ADC 1 MSPS for AD7264 Analog input impedance: >1 GΩ Wide input bandwidth −3 dB bandwidth: 1.7 MHz at gain = 2 4 on-chip comparators SNR: 78 dB typical at gain = 2, 71 dB typical at gain = 32 Device offset calibration System gain calibration On-chip reference: 2.5 V −40°C to +105°C operation High speed serial interface Compatible with SPI, QSPI™, MICROWIRE™, and DSP 48-lead LFCSP and LQFP packages GENERAL DESCRIPTION The AD7264 is a dual, 14-bit, high speed, low power, successive approximation ADC that operates from a single 5 V power supply and features throughput rates of up to 1 MSPS per on-chip ADC. Two complete ADC functions allow simultaneous sampling and conversion of two channels. Each ADC is preceded by a true differential analog input with a PGA. There are 14 gain settings available: ×1, ×2, ×3, ×4, ×6, ×8, ×12, ×16, ×24, ×32, ×48, ×64, ×96, and ×128. The AD7264 contains four comparators. Comparator A and Comparator B are optimized for low power, whereas Comparator C and Comparator D have fast propagation delays. The AD7264 features a calibration function to remove any device offset error and programmable gain adjust registers to allow input path (for example, sensor) offset and gain compensation. The AD7264 has an on-chip 2.5 V reference that can be disabled if an external reference is preferred. The AD7264 is available in 48-lead LFCSP and LQFP packages. The AD7264 is ideally suited for monitoring small amplitude signals from a variety of sensors. The devices include all the functionality needed for monitoring the position feedback signals from a variety of analog encoders used in motor control systems. FUNCTIONAL BLOCK DIAGRAM AVCC VREFA REF BUF AD7264 14-BIT VA+ VA– PGA T/H SUCCESSIVE APPROXIMATION ADC OUTPUT DRIVERS CONTROL LOGIC VB+ VB– VREFB CA_CBVCC CA+ CA– CB+ CB– CA_CB_GND CC_CDVCC CC+ CC– CD+ CD– CC_CD_GND PGA 14-BIT T/H SUCCESSIVE OUTPUT APPROXIMATION DRIVERS ADC BUF COMP OUTPUT DRIVERS COMP OUTPUT DRIVERS COMP OUTPUT DRIVERS COMP OUTPUT DRIVERS DOUTA SCLK CAL CS REFSEL G0 G1 G2 G3 VDRIVE DOUTB PD0/DIN PD1 PD2 COUTA COUTB COUTC COUTD AGND Figure 1. DGND PRODUCT HIGHLIGHTS 1. Integrated PGA with a variety of flexible gain settings to allow detection and conversion of low level analog signals. 2. Each PGA is followed by a dual simultaneous sampling ADC, featuring throughput rates of 1 MSPS per ADC. The conversion result of both ADCs is simultaneously available on separate data lines or in succession on one data line if only one serial port is available. 3. Four integrated comparators that can be used to count signals from pole sensors in motor control applications. 4. Internal 2.5 V reference. 06732-001 Rev. E Document Feedback 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 ©2008–2018 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD7264 TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications .................................................................. 6 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Typical Performance Characteristics ........................................... 10 Terminology .................................................................................... 14 Theory of Operation ...................................................................... 15 Circuit Info.


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