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ADE7755 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADE7755
Description  Energy Metering IC with Pulse Output
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADE7755 Datasheet(HTML) 1 Page - Analog Devices

 
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Energy Metering IC with Pulse Output
ADE7755
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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.
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.
FUNCTIONAL BLOCK DIAGRAM
POWER
SUPPLY MONITOR
G0 G1
AVDD
AGND
DVDD
DGND
RESET
F2
F1
CF
REVP
S1
S0
SCF
CLKOUT
CLKIN
REFIN/OUT
ADE7755
4kΩ
2.5V
REFERENCE
ADC
PGA
×1, ×2, ×8, ×16
V1P
V1N
V2P
V2N
DIGITAL-TO-FREQUENCY
CONVERTER
...110101...
...11011001...
ADC
23
9
24
22
20
13
14
12
18
17
10
21
1
2
11
3
15
16
DC
AC/
5
6
8
7
PHASE
CORRECTION
LPF
HPF
SIGNAL
PROCESSING
BLOCK
MULTIPLIER
Figure 1.
1U.S. Patents 5,745,323; 5,760,617; 5,862,069; and 5,872,469.


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