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AD7656ABSTZ-RL 数据表(PDF) 1 Page - List of Unclassifed Manufacturers |
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AD7656ABSTZ-RL 数据表(HTML) 1 Page - List of Unclassifed Manufacturers |
1 / 28 page 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC Data Sheet AD7656A FEATURES 6 independent analog-to-digital converters (ADCs) True bipolar analog inputs Pin-/software-selectable ranges: ±10 V or ±5 V Fast throughput rate: 250 kSPS i CMOS® process technology Low power: 140 mW at 250 kSPS with 5 V supplies Wide input bandwidth 86.5 dB SNR at 50 kHz input frequency On-chip reference and reference buffers Parallel, serial, and daisy-chain interface modes High speed serial interface Serial peripheral interface (SPI)/QSPI™/MICROWIRE®/DSP compatible Power-down mode: 100 mW maximum 64-lead LQFP Improved power supply sequencing (PSS) robustness APPLICATIONS Power line monitoring systems Instrumentation and control systems Multi-axis positioning systems FUNCTIONAL BLOCK DIAGRAM VSS DGND VDD REF CONVST A CONVST B CONVST C OUTPUT DRIVERS OUTPUT DRIVERS OUTPUT DRIVERS OUTPUT DRIVERS CONTROL LOGIC BUF BUF BUF AGND T/H T/H T/H T/H T/H T/H CLK OSC AVCC DVCC V1 V2 V3 V4 V5 V6 SER/PAR/SEL CS VDRIVE STBY DB8/DOUT A DB9/DOUT B DB10/DOUT C SCLK RD WR/REFEN/DIS DATA/ CONTROL LINES AD7656A 16-BIT SAR 16-BIT SAR 16-BIT SAR 16-BIT SAR 16-BIT SAR 16-BIT SAR Figure 1. GENERAL DESCRIPTION The AD7656A1 contains six 16-bit, fast, low power, successive approximation analog-to-digital converters (ADCs) all in the one package that is designed on the iCMOS® process (industrial CMOS). iCMOS is a process combining high voltage silicon with submicron CMOS and complementary bipolar technologies. It enables the development of a wide range of high performance analog ICs, capable of 33 V operation in a footprint that no previous generation of high voltage devices could achieve. Unlike analog ICs using conventional CMOS processes, iCMOS components can accept bipolar input signals while providing increased performance, which dramatically reduces power consumption and package size. The AD7656A features throughput rates of up to 250 kSPS. It contains wide bandwidth (12 MHz), track-and-hold amplifiers that can handle input frequencies up to 12 MHz. The conversion process and data acquisition are controlled using CONVST x signals and an internal oscillator. Three CONVST x pins (CONVST A, CONVST B, and CONVST C) allow independent, simultaneous sampling of the three ADC pairs. The AD7656A has a high speed parallel and serial interface, allowing the device to interface with microprocessors or digital signal processors (DSPs). In serial interface mode, the AD7656A has a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656A can accommodate true bipolar input signals in the ±4 × VREF range and ±2 × VREF range. The AD7656A also contains an on-chip 2.5 V reference. Multifunction pin names may be referenced by their relevant function only. PRODUCT HIGHLIGHTS 1. Six 16-bit, 250 kSPS ADCs on board. 2. Six true bipolar, high impedance analog inputs. 3. Parallel and high speed serial interfaces. 1 Protected by U.S. Patent No. 6,731,232. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com |
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