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Series Information for AD637ARZ - Analog Devices


  • feature
    High accuracy 0.02% maximum nonlinearity, 0 V to 2 V rms input 0.1% additional error to crest factor of 3 Wide bandwidth 8 MHz at 2 V rms input 600 kHz at 100 mV rms Computes True rms Square Mean square Absolute value dB output (60 dB range) Chip select/power-down feature allows Analog three-state operation Quiescent current reduction from 2.2 mA to 350 u00b5A



The AD637 is a complete, high accuracy, rms-to-dc converter that computes the true rms value of any complex waveform. It offers performance that is unprecedented in integrated circuit rms-to-dc converters and comparable to discrete and modular techniques in accuracy, bandwidth, and dynamic range. The AD637 computes the true root mean square, mean square, or absolute value of any complex ac (or ac plus dc) input waveform and gives an equivalent dc output voltage. The true rms value of a waveform is more useful than an average rectified signal because it relates directly to the power of the signal. The rms value of a statistical signal relates to the standard deviation of the signal. Superior crest factor compensation permits measurements of signals with crest factors of up to 10 with less than 1% additional error. The wide bandwidth of the AD637 permits the measurement of signals up to 600 kHz with inputs of 200 mV rms and up to 8 MHz when the input levels are above 1 V rms. Direct dB value of the rms output with a range of 60 dB is available on a separate pin. An externally programmed reference current allows the user to select the 0 dB reference voltage to correspond to any level between 0.1 V and 2.0 V rms. A chip select connection on the AD637 permits the user to decrease the supply current from 2.2 mA to 350 µA during periods when the rms function is not in use. This feature facilitates the addition of precision rms measurement to remote or handheld applications where minimum power consumption is critical. In addition, when the AD637 is powered down, the output goes to a high impedance state. This allows several AD637s to be tied together to form a wideband true rms multiplexer. The input circuitry of the AD637 is protected from overload voltages in excess of the supply levels. The inputs are not damaged by input signals if the supply voltages are lost. The AD637 is laser wafer trimmed to achieve rated performance without external trimming. The only external component required is a capacitor that sets the averaging period. The value of this capacitor also determines low frequency accuracy, ripple level, and settling time. The on-chip buffer amplifier is used either as an input buffer or in an active filter configuration. The filter can be used to reduce the amount of ac ripple, thereby increasing accuracy. The AD637 is available in accuracy Grade J and Grade K for commercial temperature range (0°C to 70°C) applications, accuracy Grade A and Grade B for industrial range (−40°C to +85°C) appli- cations, and accuracy Grade S rated over the −55°C to +125°C temperature range. All versions are available in hermetically sealed, 14-lead SBDIP, 14-lead CERDIP, and 16-lead SOIC_W packages.


Accuracy %:
Operating Temperature Min:
Operating Temperature Max:
Digital IC Case:
No. of Pins:
Supply Voltage Range:
± 3V to ± 18V
Product Range:
AD637 Series
RoHS Phthalates Compliant:
MSL 1 - Unlimited
No SVHC (07-Jul-2017)
Base Number:
IC Case Style:
Operating Temperature Range:
-40°C to +85°C
Power Dissipation Pd:
Supply Current:
Supply Voltage Max:
Supply Voltage Min:
Termination Type:
Surface Mount Device
Total Error:

Alternate Descriptions

RS Components
True RMS to DC Converter
Newark Electronics
RMS to DC Converter, 0.25 %, 8 MHz, -40 C, 85 C, SOIC, 16 RoHS Compliant: Yes
RS Components UK
True RMS to DC Converter
RS Components DE
DC-Wandler True RMS AD637ARZ, SOIC W 16-Pin Montage-Typ : SMD Abmessungen : 10.5 x 7.6 x 2.35mm Länge : 10.5mm Breite : 7.6mm Betriebstemperatur max. : +85 °C Betriebstemperatur min. : –40 °C Ausgangsstrom min. : 6mA Betriebstemperatur-Bereich : –40 → +85 °C Ausgangsstrom-Bereich : Mindestens 6 mA, Analog Devices
RS Components HK
True RMS to DC Converter
RS Components JP
True RMS to DC Converter
RS Components FR
Convertisseur RMS vraie-cc
RS Components CN
True RMS to DC Converter
RS Components ES
True RMS to DC Converter
RS Components NL
True RMS to DC Converter
RS Components NO
True RMS to DC Converter
RS Components US
True RMS to DC Converter
RS Components SG
True RMS to DC Converter
RS Components TW
True RMS to DC Converter