1 MSPS, 14-Bit, Simultaneous Sampling SAR ADC with PGA and Four Comparators Data Sheet AD7264 FEATURES FUNCTIONAL BLOCK DIAGRAM AV V A CC REF Dual, simultaneous sampling, 14-bit, 2-channel ADC True differential analog inputs REF BUF AD7264 Programmable gain stage: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128 14-BIT V + SUCCESSIVE A OUTPUT D A PGA T/H OUT APPROXIMATION Throughput rate per ADC DRIVERS V A ADC 1 MSPS for AD7264 SCLK Analog input impedance: >1 G CAL CS Wide input bandwidth REFSEL CONTROL G0 3 dB bandwidth: 1.7 MHz at gain = 2 LOGIC G1 4 on-chip comparators G2 G3 SNR: 78 dB typical at gain = 2, 71 dB typical at gain = 32 V DRIVE Device offset calibration 14-BIT V + B SUCCESSIVE OUTPUT System gain calibration PGA T/H D B OUT APPROXIMATION DRIVERS V B ADC On-chip reference: 2.5 V PD0/D IN PD1 40C to +105C operation BUF PD2 High speed serial interface V B REF Compatible with SPI, QSPI, MICROWIRE, and DSP C C V A B CC C + 48-lead LFCSP and LQFP packages A OUTPUT C A OUT DRIVERS C A COMP C + B OUTPUT C B OUT DRIVERS C B COMP C C GND GENERAL DESCRIPTION A B C C V C D CC The AD7264 is a dual, 14-bit, high speed, low power, successive C + C OUTPUT C C OUT DRIVERS C approximation ADC that operates from a single 5 V power supply C COMP C + D OUTPUT and features throughput rates of up to 1 MSPS per on-chip ADC. C D OUT C DRIVERS D COMP Two complete ADC functions allow simultaneous sampling and C C GND C D conversion of two channels. Each ADC is preceded by a true AGND DGND differential analog input with a PGA. There are 14 gain settings available: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, Figure 1. 96, and 128. The AD7264 contains four comparators. Comparator A and PRODUCT HIGHLIGHTS Comparator B are optimized for low power, whereas Comparator C 1. Integrated PGA with a variety of flexible gain settings to and Comparator D have fast propagation delays. The AD7264 allow detection and conversion of low level analog signals. features a calibration function to remove any device offset error 2. Each PGA is followed by a dual simultaneous sampling and programmable gain adjust registers to allow input path (for ADC, featuring throughput rates of 1 MSPS per ADC. The example, sensor) offset and gain compensation. The AD7264 has conversion result of both ADCs is simultaneously available an on-chip 2.5 V reference that can be disabled if an external on separate data lines or in succession on one data line if reference is preferred. The AD7264 is available in 48-lead LFCSP only one serial port is available. and LQFP packages. 3. Four integrated comparators that can be used to count The AD7264 is ideally suited for monitoring small amplitude signals from pole sensors in motor control applications. signals from a variety of sensors. The devices include all the 4. Internal 2.5 V reference. functionality needed for monitoring the position feedback signals from a variety of analog encoders used in motor control systems. 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 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 20082018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 06732-001AD7264 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Connection Diagrams .................................................. 17 General Description ......................................................................... 1 Application Details ..................................................................... 20 Functional Block Diagram .............................................................. 1 Modes of Operation ....................................................................... 21 Product Highlights ........................................................................... 1 Pin Driven Mode ........................................................................ 21 Revision History ............................................................................... 2 Gain Selection ............................................................................. 21 Specif icat ions ..................................................................................... 3 Power-Down Modes .................................................................. 21 Timing Specifications .................................................................. 6 Control Register ......................................................................... 22 Absolute Maximum Ratings ............................................................ 7 On-Chip Registers ...................................................................... 23 ESD Caution .................................................................................. 7 Serial Interface ................................................................................ 24 Pin Configurations and Function Descriptions ........................... 8 Calibration ....................................................................................... 26 Typical Performance Characteristics ........................................... 10 Internal Offset Calibration ........................................................ 26 Terminology .................................................................................... 14 Adjusting the Offset Calibration Register ............................... 27 Theory of Operation ...................................................................... 15 System Gain Calibration............................................................ 27 Circuit Information .................................................................... 15 Applications Information .............................................................. 28 C omp arators ................................................................................ 15 Grounding and Layout .............................................................. 28 O p erat ion ..................................................................................... 15 PCB Design Guidelines for LFCSP .......................................... 28 Analog Inputs .............................................................................. 15 Outline Dimensions ....................................................................... 29 VDRIVE ............................................................................................ 16 Ordering Guide .......................................................................... 29 Reference ..................................................................................... 16 REVISION HISTORY 2/2018Rev. D to Rev. E 7/2008Rev. 0 to Rev. A Reorganized Layout ............................................................ Universal Added AD7264-5................................................................ Universal Changed CP-48-4 to CP-48-1 ...................................... Throughout Added LQFP Package ........................................................ Universal Deleted AD7264-5 ......................................................... Throughout Changes to Figure 1 ........................................................................... 1 Changes to Figure 4 .......................................................................... 8 Changes to Common-Mode Voltage Range, VCM Parameter ......... 3 Change to Table 4 ............................................................................. 9 Changes to Table 3 ............................................................................. 7 Changes to Pin Configuration and Function Updated Outline Dimensions ....................................................... 29 Changes to Ordering Guide .......................................................... 29 Description Section ........................................................................... 8 Changes to Figure 29 ...................................................................... 19 5/2017Rev. C to Rev. D Updated Outline Dimensions ....................................................... 28 Changed CP-48-1 to CP-48-4 ...................................... Throughout Changes to Ordering Guide .......................................................... 29 Changes to Figure 4 .......................................................................... 8 Updated Outline Dimensions ....................................................... 29 5/2008Revision 0: Initial Version Changes to Ordering Guide .......................................................... 29 12/2015Rev. B to Rev. C Changes to Table 1 ............................................................................ 3 Changes to Figure 28 ...................................................................... 20 11/2012Rev. A to Rev. B Changes to Digital Input Voltage to DGND Parameter, Table 3 ...... 7 Updated Outline Dimensions ....................................................... 28 Rev. E Page 2 of 29