ADE7755ARSZRL Analog Devices Inc, ADE7755ARSZRL Datasheet

Energy Metering IC With Pulse Output

ADE7755ARSZRL

Manufacturer Part Number
ADE7755ARSZRL
Description
Energy Metering IC With Pulse Output
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADE7755ARSZRL

Input Impedance
390 KOhm
Measurement Error
0.1%
Voltage - I/o High
2.4V
Voltage - I/o Low
0.8V
Current - Supply
3mA
Voltage - Supply
4.75 V ~ 5.25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SSOP (0.200", 5.30mm Width)
Meter Type
Single Phase
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
EVAL-ADE7755ZEB - BOARD EVALUATION FOR AD7755
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

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ADE7755ARSZRL
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Part Number:
ADE7755ARSZRL
Manufacturer:
Analog Devices Inc.
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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
Synchronous CF and F1/F2 outputs
Logic output REVP provides information regarding the sign
Direct drive for electromechanical counters and 2-phase
Programmable gain amplifier (PGA) in the current channel
Proprietary ADCs and DSPs provide high accuracy over large
On-chip power supply monitoring
On-chip creep protection (no load threshold)
On-chip reference 2.5 V ± 8% (30 ppm/°C typical) with
Single 5 V supply, low power (15 mW typical)
Low cost CMOS process
1
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.
Trademarks and registered trademarks are the property of their respective owners.
U.S. Patents 5,745,323; 5,760,617; 5,862,069; and 5,872,469.
supplies instantaneous active power
of the active power
stepper motors (F1 and F2)
facilitates usage of small shunts and burden resistors
variations in environmental conditions and time
external overdrive capability
V1N
V2N
V1P
V2P
5
6
8
7
REFERENCE
G0 G1
16
×1, ×2, ×8, ×16
2.5V
15
PGA
SUPPLY MONITOR
4kΩ
REF
POWER
AV
ADC
ADC
FUNCTIONAL BLOCK DIAGRAM
3
10
IN/OUT
DD
...11011001...
AGND
...110101...
CLKIN
11
17
Energy Metering IC with Pulse Output
CLKOUT
ADE7755
CORRECTION
18
PHASE
Figure 1.
MULTIPLIER
SCF
12
AC/
DIGITAL-TO-FREQUENCY
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
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
AV
the supply voltage on AV
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.
HPF
S0
14
2
DC
DD
CONVERTER
S1
13
supply pin. The ADE7755 remains in a reset condition until
REVP
DV
20
1
DD
LPF
CF
22
PROCESSING
DGND
21
SIGNAL
BLOCK
F1
24
©2002–2009 Analog Devices, Inc. All rights reserved.
F2
23
DD
reaches 4 V. If the supply falls below
9
RESET
ADE7755
www.analog.com

ADE7755ARSZRL Summary of contents

Page 1

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 ...

Page 2

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 ...

Page 3

SPECIFICATIONS ± 5%, AGND = DGND = 0 V, on-chip reference, CLKIN = 3.58 MHz Table 1. Parameter 1, 2 ACCURACY 1 Measurement Error on Channel 1 Gain = 1 Gain ...

Page 4

ADE7755 Parameter POWER SUPPLY See the Terminology section. 2 See the Typical Performance Characteristics section for the plots. 3 Sample tested during initial release and after any redesign or process change ...

Page 5

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter AV to AGND DGND Analog Input Voltage to AGND V1P, V1N, V2P, and V2N Reference Input Voltage to ...

Page 6

ADE7755 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 DV Digital Power Supply. This pin provides the supply voltage for the digital circuitry in the ADE7755. The supply DD voltage should be maintained ...

Page 7

Pin No. Mnemonic Description 17 CLKIN An external clock can be provided at this logic input. Alternatively, a parallel resonant AT crystal can be connected across CLKIN and CLKOUT to provide a clock source for the ADE7755. The clock frequency ...

Page 8

ADE7755 TYPICAL PERFORMANCE CHARACTERISTICS 0.5 –40°C 0.4 0.3 0.2 0.1 +25°C 0 –0.1 +85°C –0.2 –0 GAIN = 1 –0.4 ON-CHIP REFERENCE –0.5 0.01 0.1 1 FULL-SCALE CURRENT (%) Figure 4. Error Reading ...

Page 9

PF = 0.5 GAIN = 8 0.6 ON-CHIP REFERENCE –40° 0.5 0.4 0.2 +25° +25° 0.5 –0.2 –0.4 +85° 0.5 –0.6 –0.8 0.01 0.1 1 FULL-SCALE CURRENT (%) Figure ...

Page 10

ADE7755 16 DISTRIBUTION CHARACTERISTICS NUMBER POINTS: 101 14 MINIMUM: –9.78871 GAIN = 1 MAXIMUM: 7.2939 TEMPERATURE = 25°C MEAN: –1.73203 12 STD. DEV: 3.61157 –15 –9 –3 3 CH1 OFFSET (mV) Figure 16. Channel ...

Page 11

TERMINOLOGY Measurement Error The error associated with the energy measurement made by the ADE7755 is defined by the following formula: = Percentage Error Energy Registered by the ADE 7755 True Energy Phase Error Between Channels The high-pass filter (HPF) in ...

Page 12

ADE7755 THEORY OF OPERATION The two ADCs of the ADE7755 digitize the voltage signals from the current and voltage transducers. These ADCs are 16-bit, second-order Σ-Δ with an oversampling rate of 900 kHz. This analog input structure greatly simplifies transducer ...

Page 13

NONSINUSOIDAL VOLTAGE AND CURRENT The active power calculation method also holds true for non- sinusoidal current and voltage waveforms. All voltage and current waveforms in practical applications have some harmonic content. Using the Fourier Transform operation, instantaneous voltage and current ...

Page 14

ADE7755 Channel 2 (Voltage Channel) The output of the line voltage transducer is connected to the ADE7755 at this analog input. Channel fully differential voltage input. The maximum peak differential signal on Channel 2 is ±660 mV. ...

Page 15

HPF and Offset Effects Figure 29 shows the effect of offsets on the active power calculation. An offset on Channel 1 and Channel 2 contributes a dc component after multiplication. Because the dc component is extracted by the LPF, it ...

Page 16

ADE7755 DIGITAL-TO- FREQUENCY V MULTIPLIER DIGITAL-TO- LPF FREQUENCY I LPF TO EXTRACT REAL POWER (DC TERM) V × cos(2ωt) ATTENUATED BY LPF ω 0 2ω FREQUENCY (RAD/s) INSTANTANEOUS ACTIVE POWER SIGNAL (FREQUENCY DOMAIN) Figure 32. Active Power-to-Frequency Conversion ...

Page 17

TRANSFER FUNCTION Frequency Outputs F1 and F2 The ADE7755 calculates the product of two voltage signals (on Channel 1 and Channel 2) and then low-pass filters this product to extract active power information. This active power information is then converted ...

Page 18

ADE7755 Table 8. Maximum Output Frequency on CF SCF ...

Page 19

NO LOAD THRESHOLD The ADE7755 also includes a no load threshold and start-up current feature that eliminates any creep effects in the meter. The ADE7755 is designed to issue a minimum output frequency in all modes except when SCF = ...

Page 20

ADE7755 OUTLINE DIMENSIONS 2.00 MAX 0.05 MIN COPLANARITY 0.10 ORDERING GUIDE Model Temperature Range 1 ADE7755ARSZ −40°C to +85°C 1 ADE7755ARSRLZ −40°C to +85°C EVAL-ADE7755EBZ 1 −40°C to +85° RoHS Compliant Part. ©2002–2009 Analog Devices, Inc. All ...

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