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AD7658BSTZ Datasheet(PDF) 1 Page - Analog Devices |
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AD7658BSTZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 25 page 250 kSPS, 6-Channel,Simultaneous Sampling, Bipolar 12/14/16-Bit ADC Preliminary Technical Data AD7658/AD7657/AD7656* Rev. PrI 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. FEATURES 6 Independent ADCs True Bipolar Analog Inputs Pin/Software Selectable Ranges:- ±10V, ±5V Fast throughput rate: 250 kSPS Specified for VCC of 4.5 V to 5.5 V Low power 160mW at 250 kSPS with 5 V supplies Wide input bandwidth: 85 dB SNR at 50 kHz input frequency On-chip Reference and Reference Buffers Parallel and Serial Interface High speed serial interface SPI/QSPI/µWire/DSP compatible Standby mode: 5 µA max iCMOSTM Process Technology 64 LQFP package APPLICATIONS Power Line Monitoring systems Instrumentation and control systems Multi-axis positioning systems FUNCTIONAL BLOCK DIAGRAM 16-BIT SAR BUF AGND DGND V1 +5 AVCC SCLK DOUTB AD7656 OUTPUT DRIVERS CONTROL LOGIC T/H VDRIVE SER/PAR VDD REF VSS T/H T/H T/H T/H T/H V2 16-BIT SAR 16-BIT SAR 16-BIT SAR 16-BIT SAR 16-BIT SAR V3 V4 V5 V6 DATA/ CONTROL LINES OUTPUT DRIVERS DOUTC OUTPUT DRIVERS OUTPUT DRIVERS CLK OSC CONVSTA CONVSTB CONVSTC DVCC 4, BUF BUF DOUTA STBY 94 Figure 1. GENERAL DESCRIPTION The AD7658/AD7657/AD7656 contain six 12/14/16-bit, fast, low power, successive approximation ADCs all in the one package. The AD7658/AD7657/AD7656 core operates from a single 4.5 V to 5.5 V power supply and features throughput rates up to 250 kSPS. The parts contain low noise, wide bandwidth track-and- hold amplifiers that can handle input frequencies up to 8 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 AD7658/AD7657/AD7656 have both a high speed parallel and serial interface allowing the devices to interface with microprocessors or DSPs. When in Serial interface mode these parts have a Daisy Chain feature allowing multiple ADCs to connect to a single serial interface. The AD7658/AD7657/AD7656 can accommodate true bipolar input signals in the ±10V range and ±5V range . They contain a 2.5V internal reference and can also accept an external reference. If a 3V external reference is applied to the VREF pin, the ADCs can accommodate a true bipolar ±12V analog input range. VDD and VSS supplies of ±12V are required for this ±12V input range. PRODUCT HIGHLIGHTS 1. Six 12/14/16-bit 250 kSPS ADCs on board. 2. Six true bipolar high impedance analog inputs. 3. The AD7658/AD7657/AD7656 feature both a parallel and a high speed serial interface. * Protected by U.S. Patent No. 6,731,232 iCMOSTM Process Technology For analog systems designers within industrial/instrumentation equipment OEMs who need high performance ICs at higher-voltage levels, iCMOS is a technology platform that enables the development of analog ICs capable of 30V and operating at +/- 15V supplies while allowing dramatic reductions in power consumption and package size, and increased AC and DC performance. |
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