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ADE7761B:  Energy Metering IC with On-Chip Fault and Missing Neutral Detection

Product Details


The ADE7761B is a high accuracy, fault-tolerant, electrical energy measurement IC intended for use with 2-wire distribution systems. The part specifications surpass the accuracy requirements as quoted in the IEC 62053-21 standard. The only analog circuitry used on the ADE7761B is in the ADCs and reference circuit. All other signal processing (such as multiplication and filtering) is carried out in the digital domain. This approach provides superior stability and accuracy over extremes in environmental conditions and over time. The ADE7761B incorporates a fault detection scheme similar to the ADE7751 by continuously monitoring both phase and neutral currents. A fault is indicated when the currents differ by more than 6.25%.

The ADE7761B incorporates a missing neutral detection scheme by continuously monitoring the input voltage. When a missing neutral condition is detected (no voltage input), the ADE7761B continues billing based on the active current signal (see the Missing Neutral Mode section). The missing neutral condition is indicated when the FAULT pin goes high. The ADE7761B supplies average active power information on the low frequency outputs, F1 and F2. The CF logic output gives instantaneous active power information.

The ADE7761B includes a power supply monitoring circuit on the VDD supply pin. Internal phase matching circuitry ensures that the voltage and current channels are matched. An internal no-load threshold ensures that the ADE7761B does not exhibit any creep when there is no load.

FEATURES and BENEFITS

  • High accuracy, active energy measurement IC supports IEC 62053-21
  • Less than 0.1% error over a dynamic range of 1000 to 1
  • Supplies active power on the frequency outputs, F1 and F2
  • High frequency output CF is intended for calibration and supplies instantaneous active power
  • Continuous monitoring of the phase and neutral current allows fault detection in 2-wire distribution systems
  • Current channel input level best suited for shunt and current transformer sensors
  • Uses the larger of the two currents (phase or neutral) to bill, even during a fault condition
  • Continuous monitoring of the voltage and current inputs allows missing neutral detection
  • Uses one current input (phase or neutral) to bill when missing neutral is detected
  • Two logic outputs (FAULT and REVP) can be used to indicate a potential miswiring, fault, or missing neutral condition
  • Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2)
  • Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time

Functional Block Diagram for ADE7761B

Documentation

Title Content Type File Type
ADE7761B: Energy Metering IC with On-Chip Fault and Missing Neutral Detection Data Sheet (Rev 0, 08/2007) (pdf, 522 kB) Data Sheets PDF
AN-563: A Tamper-Resistant Watt-Hour Energy Meter  (pdf, 348 kB)
Based on the ADE7751 and Two Current Sensors
Application Notes PDF
AN-687: A Low Cost Tamper-Resistant Energy Meter Based on the ADE7761 with Missing Neutral Function  (pdf, 762 kB) Application Notes PDF
AN-574: A Tamper-Resistant Watt-Hour Energy Meter Based on the AD7751  (pdf, 625 kB)
With a Current Transformer and a Low Resistant Shunt
Application Notes PDF
Measuring Harmonic Energy with a Solid State Energy Meter  (pdf, 46 kB)
(Reprinted with permission from Metering International where it was first printed in Issue 3, 2003)
Technical Articles PDF
IC Technology and Failure Mechanisms - Understanding Reliability Standards Can Raise Quality of Meters  (pdf, 903 kB)
by Etienne Moulin, Analog Devices, Inc. (Reprinted with permission of India's Power Magazine, PowerLine, where it first appeared in the June 2004 issue)
Technical Articles PDF
RF Meets Power Lines: Designing Intelligent Smart Grid Systems that Promote Energy Efficiency
RF DesignLine, March 2010
Technical Articles HTML
Smart Metering Technology Promotes Energy Efficiency for a Greener World
Analog Dialogue, Volume 43 – January 2009
Technical Articles HTML
All-Electronic Power and Energy Meters
(Analog Dialogue, Vol. 33, No. 2, February, 1999)
Analog Dialogue HTML
Smart Metering Technology Promotes Energy Efficiency for a Greener World
Analog Dialogue, Volume 43 – January 2009
Analog Dialogue HTML
Energy Measurement Solutions  (pdf, 2002 kB) Overview PDF
ADE Product Family Overview  (pdf, 1390 kB)
The portfolio includes single-phase products and polyphase products for stepper motor and LCD display meter designs, with five critical measurements available: watt, V rms, I rms, VA, and VAR.
Overview PDF
RAQs index Rarely Asked Questions HTML
What are the benefits of the ADE energy metering devices? FAQs/RAQs HTML
Frequently Asked Questions (FAQs): Analog Devices Energy (ADE) Products  (pdf, 656 kB) FAQs/RAQs PDF
Glossary of EE Terms Glossary 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.

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Price, packaging, availability

ADE7761B Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADE7761BARSZ Status: Production 20 ld SSOP 20 Ind Tube, 66 $1.38 $1.38 Y  Material Info PCN Purchase Sample
ADE7761BARSZ-RL Status: Production 20 ld SSOP 20 Ind Reel, 1500 - $1.38 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.


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