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ADE7755 Datasheet

Energy Metering IC

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Energy Metering IC with Pulse Output
ADE7755
FEATURES
High accuracy, surpasses 50 Hz/60 Hz IEC 687/IEC 1036
Less than 0.1% error over a dynamic range of 500 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
Synchronous CF and F1/F2 outputs
Logic output REVP provides information regarding the sign
of the active power
Direct drive for electromechanical counters and 2-phase
stepper motors (F1 and F2)
Programmable gain amplifier (PGA) in the current channel
facilitates usage of small shunts and burden resistors
Proprietary ADCs and DSPs provide high accuracy over large
variations in environmental conditions and time
On-chip power supply monitoring
On-chip creep protection (no load threshold)
On-chip reference 2.5 V ± 8% (30 ppm/°C typical) with
external overdrive capability
Single 5 V supply, low power (15 mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The ADE7755 is a high accuracy electrical energy measurement
IC. The part specifications surpass the accuracy requirements as
quoted in the IEC 1036 standard.
The only analog circuitry used in the ADE7755 is in the ADCs
and reference circuit. All other signal processing (for example,
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 ADE7755 supplies average active power information on the
low frequency outputs, F1 and F2. These logic outputs can be
used to directly drive an electromechanical counter or interface to
an MCU. The CF logic output gives instantaneous active power
information. This output is intended to be used for calibration
purposes or for interfacing to an MCU.
The ADE7755 includes a power supply monitoring circuit on the
AVDD supply pin. The ADE7755 remains in a reset condition until
the supply voltage on AVDD reaches 4 V. If the supply falls below
4 V, the ADE7755 resets and no pulse is issued on F1, F2, and CF.
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.
V1P 5
V1N 6
V2P 8
V2N 7
FUNCTIONAL BLOCK DIAGRAM
G0 G1
16 15
AVDD
3
AGND
11
AC/DC
ADE7755
2
DVDD
1
DGND
21
POWER
SUPPLY MONITOR
PHASE
CORRECTION
...110101...
ADC
PGA
×1, ×2, ×8, ×16
HPF
MULTIPLIER
SIGNAL
PROCESSING
BLOCK
LPF
...11011001...
ADC
2.5V
4k
REFERENCE
DIGITAL-TO-FREQUENCY
CONVERTER
9 RESET
10 17 18 12 14 13 20 22 24 23
REFIN/OUT CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2
Figure 1.
1U.S. Patents 5,745,323; 5,760,617; 5,862,069; and 5,872,469.
Rev. A
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
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2002–2009 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADE7755 Datasheet

Energy Metering IC

No Preview Available !

ADE7755
TABLE OF CONTENTS
Features .............................................................................................. 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Timing Characteristics ................................................................ 4 
Absolute Maximum Ratings............................................................ 5 
ESD Caution.................................................................................. 5 
Pin Configuration and Function Descriptions............................. 6 
Typical Performance Characteristics ............................................. 8 
Terminology .................................................................................... 11 
Theory of Operation ...................................................................... 12 
Power Factor Considerations.................................................... 12 
Nonsinusoidal Voltage and Current ........................................ 13 
REVISION HISTORY
8/09—Rev. 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
5/02—Revision 0: Initial Version
Analog Inputs ............................................................................. 13 
Typical Connection Diagrams.................................................. 14 
Power Supply Monitor ............................................................... 14 
Digital-to-Frequency Conversion ............................................ 15 
Interfacing the ADE7755 to a Microcontroller for Energy
Measurement ............................................................................... 16 
Power Measurement Considerations....................................... 16 
Transfer Function....................................................................... 17 
Selecting a Frequency for an Energy Meter Application ...... 18 
Frequency Outputs..................................................................... 18 
No Load Threshold .................................................................... 19 
Outline Dimensions ....................................................................... 20 
Ordering Guide .......................................................................... 20 
Rev. A | Page 2 of 20


Part Number ADE7755
Description Energy Metering IC
Maker Analog Devices
Total Page 20 Pages
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