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AD7657BSTZ-REEL Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7657BSTZ-REEL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 32 page 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-/14-/12-Bit ADC Data Sheet AD7656/AD7657/AD7658 Rev. D 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 www.analog.com Fax: 781.461.3113 ©2006–2012 Analog Devices, Inc. All rights reserved. FEATURES 6 independent ADCs True bipolar analog inputs Pin-/software-selectable ranges: ±10 V, ±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 SPI-/QSPI™-/MICROWIRE™-/DSP-compatible Standby mode: 100 µW maximum 64-lead LQFP 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 CS VDRIVE STBY DOUT A DOUT B DOUT C SCLK RD WR DATA/ CONTROL LINES AD7656/AD7657/AD7658 16-/14-/12-BIT SAR 16-/14-/12-BIT SAR 16-/14-/12-BIT SAR 16-/14-/12-BIT SAR 16-/14-/12-BIT SAR 16-/14-/12-BIT SAR Figure 1. GENERAL DESCRIPTION The AD7656/AD7657/AD76581 contain six 16-/14-/12-bit, fast, low power, successive approximation 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 technol- ogies. 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 parts 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 AD7656/AD7657/AD7658 feature throughput rates up to 250 kSPS. The parts contain low noise, wide bandwidth, track-and-hold amplifiers that can handle input frequencies up to 12 MHz. The conversion process and data acquisition are controlled using CONVST signals and an internal oscillator. Three CONVST pins allow independent, simultaneous sampling of the three ADC pairs. The AD7656/AD7657/AD7658 all have a high speed parallel and serial interface, allowing the devices to interface with microprocessors or DSPs. In serial interface mode, the parts have a daisy-chain feature that allows multiple ADCs to connect to a single serial interface. The AD7656/ AD7657/AD7658 can accommodate true bipolar input signals in the ±4 × VREF range and ±2 × VREF range. The AD7656/ AD7657/AD7658 also contain an on-chip 2.5 V reference. PRODUCT HIGHLIGHTS 1. Six 16-/14-/12-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. |
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