Energy Metering IC with Pulse Output Data Sheet ADE7755 FEATURES GENERAL DESCRIPTION High accuracy, surpasses 50 Hz/60 Hz IEC 687/IEC 1036 The ADE7755 is a high accuracy electrical energy measurement Less than 0.1% error over a dynamic range of 500 to 1 IC. The part specifications surpass the accuracy requirements Supplies active power on the frequency outputs, F1 and F2 as quoted in the IEC 1036 standard. High frequency output CF is intended for calibration and The only analog circuitry used in the ADE7755 is in the ADCs supplies instantaneous active power and reference circuit. All other signal processing (for example, Synchronous CF and F1/F2 outputs multiplication and filtering) is carried out in the digital domain. Logic output REVP provides information regarding the sign This approach provides superior stability and accuracy over of the active power extremes in environmental conditions and over time. Direct drive for electromechanical counters and 2-phase The ADE7755 supplies average active power information on stepper motors (F1 and F2) the low frequency outputs, F1 and F2. These logic outputs can Programmable gain amplifier (PGA) in the current channel be used to directly drive an electromechanical counter or interface facilitates usage of small shunts and burden resistors to an MCU. The CF logic output gives instantaneous active Proprietary ADCs and DSPs provide high accuracy over large power information. This output is intended to be used for variations in environmental conditions and time calibration purposes or for interfacing to an MCU. On-chip power supply monitoring On-chip creep protection (no load threshold) The ADE7755 includes a power supply monitoring circuit on the On-chip reference 2.5 V 8% (30 ppm/C typical) with AV supply pin. The ADE7755 remains in a reset condition until DD external overdrive capability the supply voltage on AV reaches 4 V. If the supply falls below DD Single 5 V supply, low power (15 mW typical) 4 V, the ADE7755 resets and no pulse is issued on F1, F2, and CF. Low cost CMOS process Internal phase matching circuitry ensures that the voltage and current channels are phase matched whether the HPF in Channel 1 is on or off. An internal no load threshold ensures that the ADE7755 does not exhibit any creep when there is no load. The ADE7755 is available in a 24-lead SSOP package. FUNCTIONAL BLOCK DIAGRAM G0 G1 AV AGND DV DGND DD AC/DC DD 16 15 3 11 2 1 21 ADE7755 POWER SUPPLY MONITOR SIGNAL PHASE PROCESSING CORRECTION BLOCK 5 V1P ...110101... ADC V1N 6 PGA HPF LPF 1, 2, 8, 16 MULTIPLIER V2P 8 ...11011001... ADC 7 V2N DIGITAL-TO-FREQUENCY 9 RESET CONVERTER 4k 2.5V REFERENCE 10 17 18 12 14 13 20 22 24 23 REF CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2 IN/OUT Figure 1. 1 U.S. Patents 5,745,323 5,760,617 5,862,069 and 5,872,469. Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20022019 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 02 89 6-0 01ADE7755 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Analog Inputs ............................................................................. 13 General Description ......................................................................... 1 Typical Connection Diagrams .................................................. 14 Functional Block Diagram .............................................................. 1 Power Supply Monitor ............................................................... 14 Revision History ............................................................................... 2 Digital-to-Frequency Conversion ............................................ 15 Specif icat ions ..................................................................................... 3 Interfacing the ADE7755 to a Microcontroller for Energy Measurement ............................................................................... 16 Timing Characteristics ................................................................ 4 Power Measurement Considerations ....................................... 16 Absolute Maximum Ratings ............................................................ 5 Transfer Function ....................................................................... 17 ESD Caution .................................................................................. 5 Selecting a Frequency for an Energy Meter Application ...... 18 Pin Configuration and Function Descriptions ............................. 6 Frequency Outputs ..................................................................... 18 Typical Performance Characteristics ............................................. 8 No Load Threshold .................................................................... 19 Terminology .................................................................................... 11 Outline Dimensions ....................................................................... 20 Theory of Operation ...................................................................... 12 Ordering Guide .......................................................................... 20 Power Factor Considerations .................................................... 12 Nonsinusoidal Voltage and Current ........................................ 13 REVISION HISTORY 3/2019Rev. A to Rev. B Changes to Ordering Guide .......................................................... 20 8/2009Rev. 0 to Rev. A Changes to Format ............................................................. Universal Changes to Features Section and General Description Section . 1 Moved Figure 2 ................................................................................. 4 Changes to Pin 22, Pin 23, and Pin 24 Descriptions, Table 4 ..... 7 Changes to Terminology Section.................................................. 11 Changes to Theory of Operation Section, Figure 22, Power Factor Considerations Section, and Figure 23 ............................ 12 Changes to Nonsinusoidal Voltage and Current Section and Analog Inputs Section .................................................................... 13 Changes to Figure 27 ...................................................................... 14 Changes to HPF and Offset Effects Section, Figure 29, and Digital-to-Frequency Conversion Section .................................. 15 Changes to Figure 32 ...................................................................... 16 Changes to Transfer Function Section ......................................... 17 Changes to Selecting a Frequency for an Energy Meter Application Section ........................................................................ 18 Changes to No Load Threshold Section ...................................... 19 Updated Outline Dimensions ....................................................... 20 Changes to Ordering Guide .......................................................... 20 5/2002Revision 0: Initial Version Rev. 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