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AD7401YRWZ-REEL7 Fiches technique(PDF) 1 Page - Analog Devices |
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AD7401YRWZ-REEL7 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page Isolated Sigma-Delta Modulator AD7401 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 Analog Devices, Inc. All rights reserved. FEATURES 20 MHz maximum external clock rate Second-order modulator 16 bits no missing codes ±2 LSB INL typical at 16 bits 3.5 μV/°C maximum offset drift On-board digital isolator On-board reference Low power operation: 20 mA maximum at 5.25 V −40°C to +105°C operating range 16-lead SOIC package AD7400, internal clock version Safety and regulatory approvals UL recognition 3750 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice #5A VDE Certificate of Conformity DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01 DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000 VIORM = 891 V peak APPLICATIONS AC motor controls Data acquisition systems A/D + opto-isolator replacements GENERAL DESCRIPTION The AD74011 is a second-order, Σ-Δ modulator that converts an analog input signal into a high speed, 1-bit data stream with on-chip digital isolation based on Analog Devices, Inc. iCoupler® technology. The AD7401 operates from a 5 V power supply and accepts a differential input signal of ±200 mV (±320 mV full scale). The analog input is continuously sampled by the analog modulator, eliminating the need for external sample-and-hold circuitry. The input information is contained in the output stream as a density of ones with a data rate up to 20 MHz. The original information can be reconstructed with an appropriate digital filter. The serial I/O can use a 5 V or a 3 V supply (VDD2). The serial interface is digitally isolated. High speed CMOS, combined with monolithic air core transformer technology, means the on-chip isolation provides outstanding performance characteristics, superior to alternatives such as optocoupler devices. The part contains an on-chip reference. The AD7401 is offered in a 16-lead SOIC and has an operating temperature range of −40°C to +105°C. 1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending. FUNCTIONAL BLOCK DIAGRAM VIN+ VDD1 VDD2 VIN– Σ-Δ ADC CONTROL LOGIC AD7401 BUF T/H REF WATCHDOG GND1 GND2 MDAT MCLKIN DECODE ENCODE DECODE ENCODE UPDATE WATCHDOG UPDATE Figure 1. |
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