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AD737KRZ-RL Datasheet(PDF) 1 Page - Analog Devices |
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AD737KRZ-RL Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page Low Cost, Low Power, True RMS-to-DC Converter Data Sheet AD737 Rev. I 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 ©2012 Analog Devices, Inc. All rights reserved. FEATURES Computes True rms value Average rectified value Absolute value Provides 200 mV full-scale input range (larger inputs with input scaling) Direct interfacing with 3½ digit CMOS ADCs High input impedance: 1012 Ω Low input bias current: 25 pA maximum High accuracy: ±0.2 mV ± 0.3% of reading RMS conversion with signal crest factors up to 5 Wide power supply range: ±2.5 V to ±16.5 V Low power: 25 µA (typical) standby current No external trims needed for specified accuracy The AD737 output is negative-going; the AD736 is a positive output-going version of the same basic device FUNCTIONAL BLOCK DIAGRAM COM OUTPUT CAV –VS 8kΩ BIAS SECTION ABSOLUTE VALUE CIRCUIT SQUARER DIVIDER CC VIN +VS POWER DOWN CF CAV 8kΩ Figure 1. GENERAL DESCRIPTION The AD737 is a low power, precision, monolithic, true rms-to- dc converter. It is laser trimmed to provide a maximum error of ±0.2 mV ± 0.3% of reading with sine wave inputs. Furthermore, it maintains high accuracy while measuring a wide range of input waveforms, including variable duty cycle pulses and triac (phase) controlled sine waves. The low cost and small physical size of this converter make it suitable for upgrading the performance of non-rms precision rectifiers in many applications. Compared to these circuits, the AD737 offers higher accuracy at equal or lower cost. The AD737 can compute the rms value of both ac and dc input voltages. It can also be operated ac-coupled by adding one external capacitor. In this mode, the AD737 can resolve input signal levels of 100 µV rms or less, despite variations in tem- perature or supply voltage. High accuracy is also maintained for input waveforms with crest factors of 1 to 3. In addition, crest factors as high as 5 can be measured (while introducing only 2.5% additional error) at the 200 mV full-scale input level. The AD737 has no output buffer amplifier, thereby significantly reducing dc offset errors occurring at the output, which makes the device highly compatible with high input impedance ADCs. Requiring only 160 µA of power supply current, the AD737 is optimized for use in portable multimeters and other battery- powered applications. In power-down mode, the standby supply current in is typically 25 µA. The AD737 has both high (1012 Ω) and low impedance input options. The high-Z FET input connects high source impedance input attenuators, and a low impedance (8 kΩ) input accepts rms voltages to 0.9 V while operating from the minimum power supply voltage of ±2.5 V. The two inputs can be used either single ended or differentially. The AD737 achieves 1% of reading error bandwidth, exceeding 10 kHz for input amplitudes from 20 mV rms to 200 mV rms, while consuming only 0.72 mW. The AD737 is available in two performance grades. The AD737J and AD737K grades operate over the commercial temperature range of 0°C to 70°C. The AD737JR-5 is tested with supply voltages of ±2.5 V dc. The AD737A grade operates over the industrial temperature range of −40°C to +85°C. The AD737 is available in two low cost, 8lead packages: PDIP and SOIC_N. PRODUCT HIGHLIGHTS 1. Computes average rectified, absolute, or true rms value of a signal regardless of waveform. 2. Only one external component, an averaging capacitor, is required for the AD737 to perform true rms measurement. 3. The standby power consumption of 125 μW makes the AD737 suitable for battery-powered applications. |
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