AD637JQ Datasheet

PMIC - RMS to DC Converters


The AD637JQ is a complete high accuracy monolithic 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. A crest factor compensation scheme in the AD637JQ permits measurements of signals with crest factors of up to 10 with less than 1% additional error. The circuit’s wide bandwidth 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.As with previous monolithic rms converters from Analog Devices,the AD637JQ has an auxiliary dB output available to the user. The logarithm of the rms output signal is brought out to a separate pin allowing direct dB measurement with a useful range of 60 dB. 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 AD637JQ permits the user to decrease the supply current from 2.2 mA to 350 mA during periods when the rms function is not in use. This feature facilitates the addition of precision rms measurement to remote or hand-held applications where minimum power consumption is critical. In addition when the AD637JQ is powered down the output goes to a high impedance state. This allows several AD637JQs to be tied together to form a wide-band true rms multiplexer.The input circuitry of the AD637 is protected from overload voltages that are in excess of the supply levels. The inputs will not be damaged by input signals if the supply voltages are lost.The AD637JQ is available in two accuracy grades (J, K) for commercial(0°C to +70°C) temperature range applications; two accuracy grades (A, B) for industrial (–40°C to +85°C) applications;and one (S) rated over the –55°C to +125°C temperature range. All versions are available in hermetically-sealed, 14-lead side-brazed ceramic DIPs as well as low cost cerdip packages. A 16-lead SOIC package is also available. AD637JQ Features • High Accuracy 0.02% Max Nonlinearity, 0 V to 2 V RMS Input 0.10% 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 “3-State” Operation Quiescent Current Reduction from 2.2 mA to 350 mA• Side-Brazed DIP, Low Cost Cerdip and SOIC


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