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AD7725 Datasheet(PDF) 1 Page - Analog Devices |
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AD7725 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 28 page  REV. A 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. 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. AD7725 16-Bit 900 kSPS - ADC with a Programmable Postprocessor FEATURES Programmable Filtering: Any Characteristic up to 108 Tap FIR and/or IIR Polynomial Signal Conditioning up to 8th Order Programmable Decimation and Output Word Rate Flexible Programming Modes: Boot from DSP or External EPROM Parallel/Serial Interface Internal Default Filter for Evaluation 14.4 MHz Max Master Clock Frequency 0 V to +4 V (Single-Ended) or 2 V (Differential) Input Range Power Supplies: AVDD, DVDD: 5 V 5% On-Chip 2.5 V Voltage Reference 44-Lead MQFP Package TYPICAL APPLICATIONS Radar Sonar Auxiliary Car Functions Medical Communications FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD7725 is a complete 16-bit, - analog-to-digital con- verter with on-chip, user-programmable signal conditioning. The output of the modulator is processed by three cascaded finite impulse response (FIR) filters, followed by a fully user-program- mable postprocessor. The postprocessor provides processing power of up to 130 million accumulates (MAC) per second. The user has complete control over the filter response, the filter coeffi- cients, and the decimation ratio. The postprocessor permits the signal conditioning characteris- tics to be programmed through a parallel or serial interface. It is programmed by loading a user-defined filter in the form of a configuration file. This filter can be loaded from a DSP or an external serial EPROM. It is generated using a digital filter design package called Filter Wizard, which is available from the AD7725 section on the Analog Devices website. Filter Wizard allows the user to design different filter types and generates the appropriate configuration file to be down- loaded to the postprocessor. The AD7725 also has an internal default filter for evaluation purposes. It provides 16-bit performance for input bandwidths up to 350 kHz with an output word rate of 900 kHz maximum. The input sample rate is set either by the crystal oscillator or an external clock. This part has an accurate on-chip 2.5 V reference for the modu- lator. A reference input/output function allows either the internal reference or an external system reference to be used as the reference source for the modulator. The device is available in a 44-lead MQFP package and is speci- fied over a –40 °C to +85°C temperature range. 2.5V REFERENCE POST- PROCESSOR DEFAULT FILTER (ROM) XTAL CLOCK PRESET FILTER MOD CONTROL LOGIC UNI HALF PWR STBY SYNC S/ P VIN (+) VIN (–) RD/ WR SOE/CS CFMT/RS DVAL/INT SDI/DB0 SCR/DB13 CFGEND/DB12 DB11 DB10 FSO/DB9 SMODE1/DB15 SMODE0/DB14 XTAL_OFF XTAL CLKIN DVDD DGND REF2 REF1 AVDD AGND AD7725 |
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