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AD536A:  Integrated Circuit True RMS-to-DC Converter

Product Details


The AD536A is a complete monolithic integrated circuit that performs true rms-to-dc conversion. It offers performance comparable or superior to that of hybrid or modular units costing much more. The AD536A directly computes the true rms value of any complex input waveform containing ac and dc components. A crest factor compensation scheme allows measurements with 1% error at crest factors up to 7. The wide bandwidth of the device extends the measurement capability to 300 kHz with less than 3 dB errors for signal levels greater that 100 mV.

An important feature of the AD536A, not previously available in rms converters, is an auxiliary dB output pin. The logarithm of the rms output signal is brought out to a separate pin to allow the dB conversion, with a useful dynamic range of 60 dB. Using an externally supplied reference current, the 0 dB level can be conveniently set to correspond to any input level from 0.1 V to 2 V rms.

The AD536A is laser trimmed to minimize input and output offset voltage, to optimize positive and negative waveform symmetry (dc reversal error), and to provide full-scale accuracy at 7 V rms. As a result, no external trims are required to achieve the rated unit accuracy.

The input and output pins are fully protected. The input circuitry can take overload voltages well beyond the supply levels. Loss of supply voltage with the input connected to external circuitry does not cause the device to fail. The output is short-circuit protected.

The AD536A is available in two accuracy grades (J and K) for commercial temperature range (0°C to +70°C) applications, and one grade (S) rated for the -55°C to +125°C extended range. The AD536AK offers a maximum total error of ±2 mV ±0.2% of reading, while the AD536AJ and AD536AS have maximum errors of ±5 mV ±0.5% of reading. All three versions are available in a hermetically sealed 14-lead DIP or 10-pin TO-100 metal header package. The AD536AS is also available in a 20-terminal leadless hermetically sealed ceramic chip carrier.

The AD536A computes the true root-mean-square level of a complex ac (or ac plus dc) input signal and provides an equivalent dc output level. The true rms value of a waveform is a more useful quantity than the average rectified value because it relates directly to the power of the signal. The rms value of a statistical signal also relates to its standard deviation.

An external capacitor is required to perform measurements to the fully specified accuracy. The value of this capacitor determines the low frequency ac accuracy, ripple amplitude, and settling time.

The AD536A operates equally well from split supplies or a single supply with total supply levels from 5 V to 36 V. With 1 mA quiescent supply current, the device is well suited for a wide variety of remote controllers and battery-powered instruments.

Data Sheet, Rev D, 08/2008

FEATURES and BENEFITS

  • Laser-trimmed to high accuracy
    ±0.2% maximum error (AD536AK)
    ±0.5% maximum error (AD536AJ)
  • Wide response capability:
    Computes rms of ac and dc signals
    450 kHz bandwidth: V rms > 100 mV
    2 MHz bandwidth: V rms > 1 V
    Signal crest factor of 7 for 1% error
  • True rms-to-dc conversion
  • dB output with 60 dB range
  • Low power: 1.2 mA quiescent current
  • Single- or dual-supply operation
  • Monolithic integrated circuit
  • -55°C to +125°C operation (AD536AS)

Functional Block Diagram for AD536A

AD536A Diagram
Functional Block Diagram for AD536A

Documentation

Title Content Type File Type
AD536A: Integrated Circuit True RMS-to-DC Converter Data Sheet (Rev E, 07/2012) (pdf, 456 kB) Data Sheets PDF
AD536A Military Data Sheet  (Rev A, 01/2002) (pdf) Data Sheets PDF
AN-653: Improving Temperature, Stability, and Linearity of High Dynamic Range RMS RF Power Detectors  (pdf, 415 kB) Application Notes PDF
AN-214: Ground Rules for High Speed Circuits  (pdf, 356 kB)
Layout and Wiring Are Critical in Video Converter Circuits.
Application Notes PDF
AN-268: RMS-to-DC Converters Ease Measurement Tasks  (pdf, 638 kB)
RMS-to-DC Converters compute the true RMS value of a signal without regard to waveform shape.
Application Notes PDF
RMS-to-DC Application Guide Second Edition Design Handbooks HTML
Introduction to Analog RMS-to-DC Technology: Converters and Applications Online Training Modules HTML
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD536A SPICE Macro Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD536A Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
5962-89805012A Status: Production LCC:CER LEADLESS CHIP CARR 20 Mil Tube, 54 $126.13 $113.52 N  Material Info PCN Purchase
5962-8980501CA Status: Production 14 ld Bottom-Brazed CerDIP 14 Mil Tube, 25 $155.27 $139.73 N  Material Info PCN Purchase
5962-8980501IA Status: Production ROUND HEADER/METAL CAN 10 Mil Tube, 100 $127.91 $115.12 N  Material Info PCN Purchase
AD536AJD Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $26.98 $25.87 N  Material Info PCN Purchase
AD536AJDZ Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $23.87 $22.88 Y  Material Info PCN Purchase
AD536AJH Status: Production ROUND HEADER/METAL CAN 10 Comm. Tube, 100 $16.87 $15.20 N  Material Info PCN Purchase
AD536AJHZ Status: Production ROUND HEADER/METAL CAN 10 Comm. Tube, 100 $15.50 $13.96 Y  Material Info PCN Purchase
AD536AJQ Status: Production 14 ld CerDIP 14 Comm. Tube, 25 $10.10 $9.09 N  Material Info PCN Purchase
AD536AKD Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $48.44 $46.41 N  Material Info PCN/PDN Purchase
AD536AKDZ Status: Production 14 ld Bottom-Brazed CerDIP 14 Comm. Tube, 25 $42.86 $41.07 Y  Material Info PCN Purchase
AD536AKH Status: Production ROUND HEADER/METAL CAN 10 Comm. Tube, 100 $25.39 $24.32 N  Material Info PCN/PDN Purchase
AD536AKHZ Status: Production ROUND HEADER/METAL CAN 10 Comm. Tube, 100 $22.30 $21.37 Y  Material Info PCN Purchase
AD536AKQ Status: Obsolete 14 ld CerDIP 14 Comm. Tube, 25 - - N  Material Info PCN/PDN Contact ADI
AD536ASCHIPS Status: Production CHIPS OR DIE 0 Mil Tray, 81 - - Y  Material Info Notify Me Contact ADI
AD536ASD Status: Production 14 ld Bottom-Brazed CerDIP 14 Mil Tube, 25 $74.04 $66.63 N  Material Info PCN Purchase
AD536ASD/883B Status: Production 14 ld Bottom-Brazed CerDIP 14 Mil Tube, 25 $152.54 $137.30 N  Material Info PCN Purchase
AD536ASE/883B Status: Production LCC:CER LEADLESS CHIP CARR 20 Mil Tube, 54 $183.79 $165.43 N  Material Info PCN Purchase
AD536ASH Status: Production ROUND HEADER/METAL CAN 10 Mil Tube, 100 $52.10 $47.04 N  Material Info PCN Purchase
AD536ASH/883B Status: Production ROUND HEADER/METAL CAN 10 Mil Tube, 100 $128.83 $115.94 N  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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