Add to Signal Chain Designer

AD736:  Low Cost, Low Power, True RMS-to-DC Converter

Product Details


Newer Alternatives: AD8436: Faster settling time, wider dynamic range, embedded input/output low bias current buffer with smaller package.

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 μV 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 μA 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 Ω) that directly interfaces with High-Z input attenuators and a low impedance input (8 kΩ) 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 0°C to +70°C and −20°C to +85°C commercial temperature ranges. The AD736A and AD736B grades are rated over the −40°C to +85°C industrial temperature range. The AD736 is available in three low cost, 8-lead packages: PDIP, SOIC, and CERDIP.

Product Highlights

  1. The AD736 is 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 AD736 to perform true rms measurement.
  3. The low power consumption of 1 mW makes the AD736 suitable for many battery-powered applications.
  4. A high input impedance of 1012 Ω eliminates the need for an external buffer when interfacing with input attenuators.
  5. 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. I, 12/12

FEATURES and BENEFITS

  • Converts an ac voltage waveform to a dc voltage and then converts to the true rms, average rectified, or absolute value 200 mV rms full-scale input range (larger inputs with input attenuator)
  • High input impedance: 1012 Ω
  • Low input bias current: 25 pA maximum
  • High accuracy: ±0.3 mV ± 0.3% of reading
  • RMS conversion with signal crest factors up to 5
  • Wide power supply range:
    +2.8 V, −3.2 V to ±16.5 V
  • Low power: 200 μA maximum supply current
  • Buffered voltage output
  • No external trims needed for specified accuracy
  • Related device: the AD737 features a power-down control with standby current of only 25 μA; the dc output voltage is negative and the output impedance is 8 kΩ

Functional Block Diagram for AD736

Similar Products

Consider AD8436 - a new generation, translinear precision, low power, true rms-to-dc converter that is loaded with options.  New

Documentation

Title Content Type File Type
AD736: Low Cost, Low Power, True RMS-to-DC Converter Data Sheet (Rev I, 12/2012) (pdf, 572 kB) 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-269: Extend RMS-to-DC Converter's Range  (pdf, 91 kB) 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
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD736 SPICE Macro Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

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

AD736 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD736AQ Status: Production 8 ld CerDIP 8 Ind Tube, 48 $9.98 $9.03 N  Material Info PCN Purchase
AD736AR-REEL Status: Production 8 ld SOIC 8 Reel, 2500 - $5.10 N  Material Info PDN Purchase
AD736AR-REEL7 Status: Production 8 ld SOIC 8 Reel, 1000 - $5.10 N  Material Info PDN Purchase
AD736ARZ Status: Production 8 ld SOIC 8 Tube, 98 $4.75 $4.29 Y  Material Info Notify Me Purchase
AD736ARZ-R7 Status: Production 8 ld SOIC 8 Reel, 1000 - $4.29 Y  Material Info Notify Me Purchase
AD736ARZ-RL Status: Production 8 ld SOIC 8 Reel, 2500 - $4.29 Y  Material Info Notify Me Purchase
AD736BQ Status: Production 8 ld CerDIP 8 Ind Tube, 48 $11.96 $10.82 N  Material Info PCN Purchase
AD736BR-REEL Status: Production 8 ld SOIC 8 Reel, 2500 - $8.72 N  Material Info PDN Purchase
AD736BR-REEL7 Status: Production 8 ld SOIC 8 Reel, 1000 $9.64 $8.72 N  Material Info PDN Purchase
AD736BRZ Status: Production 8 ld SOIC 8 Tube, 98 $8.47 $7.65 Y  Material Info Notify Me Purchase
AD736BRZ-R7 Status: Production 8 ld SOIC 8 Reel, 1000 - $7.65 Y  Material Info Notify Me Purchase
AD736BRZ-RL Status: Production 8 ld SOIC 8 Reel, 2500 - $7.65 Y  Material Info PDN Purchase
AD736JN Status: Production 8 ld PDIP 8 Comm. Tube, 50 $5.93 $5.36 N  Material Info PCN/PDN Purchase
AD736JNZ Status: Production 8 ld PDIP 8 Comm. Tube, 50 $4.99 $4.50 Y  Material Info PCN Purchase
AD736JR Status: Production 8 ld SOIC 8 Comm. Tube, 98 $5.65 $5.10 N  Material Info PDN Purchase
AD736JR-REEL Status: Production 8 ld SOIC 8 Comm. Reel, 2500 - $5.10 N  Material Info PDN Purchase
AD736JR-REEL7 Status: Production 8 ld SOIC 8 Comm. Reel, 750 $5.65 $5.10 N  Material Info PDN Purchase
AD736JRZ Status: Production 8 ld SOIC 8 Comm. Tube, 98 $4.75 $4.29 Y  Material Info Notify Me Purchase
AD736JRZ-R7 Status: Production 8 ld SOIC 8 Comm. Reel, 1000 - $4.29 Y  Material Info Notify Me Purchase
AD736JRZ-RL Status: Production 8 ld SOIC 8 Comm. Reel, 2500 - $4.29 Y  Material Info Notify Me Purchase
AD736KNZ Status: Production 8 ld PDIP 8 Comm. Tube, 50 $8.49 $7.66 Y  Material Info PCN Purchase
AD736KRZ Status: Production 8 ld SOIC 8 Comm. Tube, 98 $8.91 $8.06 Y  Material Info Notify Me Purchase
AD736KRZ-R7 Status: Production 8 ld SOIC 8 Comm. Reel, 1000 $8.91 $8.06 Y  Material Info Notify Me Purchase
AD736KRZ-RL Status: Production 8 ld SOIC 8 Comm. Reel, 2500 - $8.06 Y  Material Info Notify Me 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.

AD736 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD736-EVALZ Status: Production Evaluation Board $106.21 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

Check Inventory & Purchase

View Sales and Distribution Offices

沪ICP备09046653号
content here.
content here.

Review this Product

Close