Low Cost, Low Power, True RMS-to-DC Converter

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 V rms or less, despite variations in temperature 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 A of power supply current, the AD737 is optimized for use in portable multimeters and other battery-powered applications. This converter also provides a power-down feature that reduces the power-supply standby current to less than 30 A.
Two signal input terminals are provided in the AD737. A high impedance (1012 ) FET input Interfaces directly with high R input Attenuators and a low impedance (8 k) 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 four performance grades. The AD737J and AD737K grades are rated over the commercial temperature range of 0C to 70C. The AD737JR-5 is tested with supply voltages of 2.5 V dc. The AD737A and AD737B grades are rated over the industrial temperature range of 40C to +85C. The AD737 is available in three low cost, 8lead packages: PDIP, SOIC_N, and CERDIP.
Product Highlights 1. Capable of computing the average rectified value, absolute value, or true rms value of various input signals. 2. Only one external component, an averaging capacitor, is required for the AD737 to perform true rms measurement. 3. The low power consumption of 0.72 mW makes the AD737 suitable for battery-powered applications.
* Protected under U.S. Patent Number 5,495,245.
By Analog Devices, Inc.
AD737 's PackagesAD737 's pdf datasheet
AD737-EVALZ
AD737AN PDIP
AD737ANZ PDIP
AD737AQ DIP
AD737AR SOIC
AD737ARZ SOIC
AD737BQ DIP
AD737JN PDIP
AD737JNZ PDIP
AD737JR SOIC
AD737JR-5 SOIC
AD737JR-5-REEL SOIC
AD737JR-5-REEL7 SOIC
AD737JR-REEL SOIC
AD737JR-REEL7 SOIC
AD737JRZ SOIC
AD737JRZ-5 SOIC
AD737JRZ-5-R7 SOIC
AD737JRZ-5-RL SOIC
AD737JRZ-R7 SOIC
AD737JRZ-RL SOIC
AD737KN PDIP
AD737KNZ PDIP
AD737KR SOIC
AD737KR-REEL SOIC
AD737KR-REEL7 SOIC
AD737KRZ SOIC
AD737KRZ-R7 SOIC
AD737KRZ-RL SOIC




AD737 Pinout, Pinouts
AD737 pinout,Pin out
This is one package pinout of AD737,If you need more pinouts please download AD737's pdf datasheet.

AD737 Application circuits
AD737 circuits
This is one application circuit of AD737,If you need more circuits,please download AD737's pdf datasheet.


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