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AD8436:  Low Cost, Low Power, True RMS-to-DC Converter

Product Details

Product Status:Recommended for New Designs

The AD8436 is a new generation, translinear precision, low power, true rms-to-dc converter loaded with options. It computes a precise dc equivalent of the rms value of ac wave-forms, including complex patterns such as those generated by switch mode power supplies and triacs. Its accuracy spans a wide range of input levels (see Figure 2) and temperatures. The ensured accuracy of ≤±0.5% and ≤10 μV output offset result from the latest Analog Devices, Inc., technology. The crest factor error is <0.5% for CF values between 1 and 10.

The AD8436 delivers true rms results at less cost than misleading peak, averaging, or digital solutions. There is no programming expense or processor overhead to consider, and the 4 mm × 4 mm package easily fits into tight applications. On-board buffer amplifiers enable the widest range of options for any rms-to-dc converter available, regardless of cost. For minimal applications, only a single external averaging capacitor is required. The built-in high impedance FET buffer provides an interface for external attenuators, frequency compensation, or driving low impedance loads. A matched pair of internal resistors enables an easily configurable gain-of-two or more, extending the usable input range even lower. The low power, precision input buffer makes the AD8436 attractive for use in portable multi-meters and other battery-powered applications.

The precision dc output buffer minimizes errors when driving low impedance loads with extremely low offset voltages, thanks to internal bias current cancellation. Unlike digital solutions, the AD8436 has no switching circuitry limiting performance at high or low amplitudes (see Figure 2). A usable response of <100 μV and >3 V extends the dynamic range with no external scaling, accommodating demanding low level signal conditions and allowing ample overrange without clipping.

The AD8436 operates from single or dual supplies of ±2.4 V (4.8 V) to ±18 V (36 V). A and J grades are available in a compact 4 mm × 4 mm, 20-lead chip-scale package; A and B grades are available in a 20-lead QSOP package. The operating temperature ranges are −40°C to 125°C for A and B grades and 0°C to 70°C for J grade.

FEATURES and BENEFITS

  • Delivers true rms or average rectified value of ac waveform
    -Fast settling at all input levels
    -Accuracy: ±10 μV ± 0.25% of reading (B grade)
  • Wide dynamic input range
    100 μV rms to 3 V rms (8.5 V p-p)
    full-scale input range
    Larger inputs with external scaling
  • Wide bandwidth:
    1 MHz for −3 dB (300 mV)
    65 kHz for additional 1% error
  • Zero converter dc output offset
  • No residual switching products
  • Specified at 300 mV rms input
  • Accurate conversion with crest factors up to 10
  • Low power: 300 μA typ at ±2.4 V
  • High-Z FET separately powered input buffer
    RIN ≥ 1012 Ω, CIN ≤ 2 pF
  • Precision dc output buffer
  • Wide power supply voltage range
    Dual: ±2.4 V to ±18 V;
    single: 4.8 V to 36 V
  • 4 mm × 4 mm LFCSP and
    8 mm × 6 mm QSOP packages
  • ESD protected

Functional Block Diagram for AD8436

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Documentation

Title Content Type File Type
AD8436: Low Cost, Low Power, True RMS-to-DC Converter Data Sheet (Rev B, 01/2013) (pdf, 193 kB) Data Sheets PDF
AD8436: Low Cost, Low Power, True RMS-to-DC Converter
Consider the AD8436 as an rms-dc toolbox. It is a highly integrated compact device that meets the demands of the 21st century, delivering modern solutions to industrial and instrumentation problems.
Videos HTML
RMS-to-DC Application Guide Second Edition Design Handbooks HTML
Introduction to Analog RMS-to-DC Technology: Converters and Applications Online Training Modules HTML
MS-2405: Simple Circuit Measures the RMS Value of an AC Power Line  (pdf, 234 kB) Technical Articles PDF
What is rms? FAQs/RAQs HTML
What does rms mean in the context of electrical engineering? FAQs/RAQs HTML
What then is an rms-dc converter? FAQs/RAQs HTML
Why is rms important? FAQs/RAQs HTML
What does 'true rms' mean? FAQs/RAQs HTML
What is unique about the AD8436? FAQs/RAQs HTML
What about power consumption for the added amplifiers? FAQs/RAQs HTML
My hand-held meter project has only a battery for a power supply. Must I provide a separate negative power supply for the AD8436? FAQs/RAQs HTML
You advertise conversion down to 100μV. Why would anyone need this type of level? FAQs/RAQs HTML
So far you've spoken only about power applications. What other types of applications would the AD8436 fulfill? FAQs/RAQs HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8436 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

AD8436 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8436ACPZ-R7 Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Reel, 1500 $5.94 $4.95 Y  Material Info PCN Purchase
AD8436ACPZ-RL Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Reel, 5000 $5.94 $4.95 Y  Material Info PCN Purchase
AD8436ACPZ-WP Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Tray, 64 $5.94 $4.95 Y  Material Info Notify Me Purchase
AD8436ARQZ Status: Production 20 ld QSOP 20 Ind Tube, 56 $5.94 $4.95 Y  Material Info Notify Me Purchase Sample
AD8436ARQZ-R7 Status: Production 20 ld QSOP 20 Ind Reel, 1000 - $4.95 Y  Material Info Notify Me Purchase
AD8436ARQZ-RL Status: Production 20 ld QSOP 20 Ind Reel, 2500 - $4.95 Y  Material Info Notify Me Purchase
AD8436BRQZ Status: Production 20 ld QSOP 20 Ind Tube, 56 $10.74 $8.95 Y  Material Info Notify Me Purchase Sample
AD8436BRQZ-R7 Status: Production 20 ld QSOP 20 Ind Reel, 1000 - $8.95 Y  Material Info Notify Me Purchase
AD8436BRQZ-RL Status: Production 20 ld QSOP 20 Ind Reel, 2500 - $8.95 Y  Material Info Notify Me Purchase
AD8436JCPZ-R7 Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Comm. Reel, 1500 $3.54 $2.95 Y  Material Info PCN Purchase
AD8436JCPZ-RL Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Comm. Reel, 5000 $3.54 $2.95 Y  Material Info PCN Purchase
AD8436JCPZ-WP Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Comm. Tray, 64 $3.54 $2.95 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.

AD8436 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8436-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.

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