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

The AD736 is a low power, precision, monolithic true rms-to-dc converter. It is laser trimmed to provide a maximum error of 0.3 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 size of this converter make it suitable for upgrading the performance of non-rms precision Rectifiers in many applications. Compared to these circuits, the AD736 offers higher accuracy at an equal or lower cost.
The AD736 CAN compute the rms value of both ac and dc input voltages. It CAN also be operated as an ac-coupled device by adding one external capacitor. In this mode, the AD736 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 (introducing only 2.5% additional error) at the 200 mV full-scale input level.
The AD736 has its own output Buffer Amplifier thereby pro-viding a great deal of design flexibility. Requiring only 200 A of power supply current, the AD736 is optimized for use in portable multimeters and other battery-powered applications.
The AD736 allows the choice of two signal input terminals: a high impedance FET input (1012 ) that directly Interfaces with High-Z input Attenuators and a low impedance input (8 k) that allows the measurement of 300 mV input levels while operating from the minimum power supply voltage of +2.8 V, 3.2 V. The two inputs CAN be used either single ended or differentially.
The AD736 has a 1% reading error bandwidth that exceeds 10 kHz for the input amplitudes from 20 mV rms to 200 mV rms while consuming only 1 mW.
The AD736 is available in four performance grades. The AD736J and AD736K grades are rated over the 0C to +70C and 20C to +85C commercial temperature ranges. The AD736A and AD736B grades are rated over the 40C to +85C industrial temperature range. The AD736 is available in three low cost, 8-lead packages: PDIP, SOIC, and CERDIP.
Product Highlights The AD736 is capable of computing the average rectified value, absolute value, or true rms value of various input signals. Only one external component, an averaging capacitor, is required for the AD736 to perform true rms measurement. The low power consumption of 1 mW makes the AD736 suitable for many battery-powered applications. A high input impedance of 1012 eliminates the need for an external Buffer when interfacing with input Attenuators A low impedance input is available for those applications that require an input signal up to 300 mV rms operating from low power supply voltages.
Data Sheet, Rev. H, 2/07
By Analog Devices, Inc.
AD736 's PackagesAD736 's pdf datasheet
AD736-EVALZ
AD736AQ DIP
AD736AR SOIC
AD736AR-REEL SOIC
AD736AR-REEL7 SOIC
AD736ARZ SOIC
AD736ARZ-R7 SOIC
AD736ARZ-RL SOIC
AD736BQ DIP
AD736BR SOIC
AD736BR-REEL SOIC
AD736BR-REEL7 SOIC
AD736BRZ SOIC
AD736BRZ-R7 SOIC
AD736BRZ-REEL SOIC
AD736BRZ-RL SOIC
AD736JN PDIP
AD736JNZ PDIP
AD736JR SOIC
AD736JR-REEL SOIC
AD736JR-REEL7 SOIC
AD736JRZ SOIC
AD736JRZ-R7 SOIC
AD736JRZ-RL SOIC
AD736KN PDIP
AD736KNZ PDIP
AD736KR SOIC
AD736KR-REEL SOIC
AD736KR-REEL7 SOIC
AD736KRZ SOIC
AD736KRZ-R7 SOIC
AD736KRZ-RL SOIC




AD736 Pinout, Pinouts
AD736 pinout,Pin out
This is one package pinout of AD736,If you need more pinouts please download AD736's pdf datasheet.

AD736 Application circuits
AD736 circuits
This is one application circuit of AD736,If you need more circuits,please download AD736's pdf datasheet.


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