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AD71056 PDF даташит

Спецификация AD71056 изготовлена ​​​​«Analog Devices» и имеет функцию, называемую «Energy Metering IC».

Детали детали

Номер произв AD71056
Описание Energy Metering IC
Производители Analog Devices
логотип Analog Devices логотип 

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AD71056 Даташит, Описание, Даташиты
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Energy Metering IC with Integrated
Oscillator and Reverse Polarity Indication
AD71056
FEATURES
On-chip oscillator as clock source
High accuracy, supports 50 Hz/60 Hz IEC62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Supplies average real power on frequency outputs (F1, F2)
High frequency output (CF) calibrates and supplies
instantaneous real power
Logic output (REVP) indicates potential miswiring or
negative power
Direct drive for electromechanical counters and 2-phase
stepper motors (F1, F2)
Proprietary ADCs and DSP 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 2.45 V (20 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (20 mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The AD710561 is a high accuracy, electrical energy metering IC
with a precise oscillator circuit that serves as a clock source to
the chip. The AD71056 eliminates the need for an external
crystal or resonator, thus reducing the overall cost of building a
meter with this IC. The chip directly interfaces with the shunt
resistor.
The AD71056 specifications surpass the accuracy requirements
as quoted in the IEC62053-21 standard.
The only analog circuitry used in the AD71056 is in the Σ-Δ
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
time and in extreme environmental conditions.
The AD71056 supplies average real power information on F1
and F2, the low frequency outputs. These outputs either directly
drive an electromechanical counter or interface with an MCU.
The high frequency CF logic output, ideal for calibration
purposes, provides instantaneous real power information.
The AD71056 includes a power supply monitoring circuit on
the VDD supply pin. The AD71056 remains inactive until the
supply voltage on VDD reaches approximately 4 V. If the supply
falls below 4 V, the AD71056 also remains inactive and the F1,
F2, and CF outputs are in their nonactive modes.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched, and the HPF in the current
channel eliminates dc offsets. An internal no load threshold
ensures that the AD71056 does not exhibit creep when no load
is present.
The part is available in a 16-lead, narrow body SOIC package.
V2P 2
V2N 3
V1N 4
V1P 5
FUNCTIONAL BLOCK DIAGRAM
VDD
1
AGND
6
POWER
SUPPLY MONITOR
+ Σ-Δ ...110101...
ADC
AD71056
DGND
13
MULTIPLIER
SIGNAL
PROCESSING
BLOCK
+
2.5V
REFERENCE
Σ-Δ
ADC
4k
...11011001...
PHASE
CORRECTION
Ф
HPF
LPF
INTERNAL
OSCILLATOR
DIGITAL-TO-FREQUENCY
CONVERTER
7
REFIN/OUT
11
RCLKIN
8 10 9 12 14 16 15
SCF S0 S1 REVP CF F1 F2
Figure 1.
1 U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others pending.
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
©2006 Analog Devices, Inc. All rights reserved.









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AD71056 Даташит, Описание, Даташиты
AD71056
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
Terminology ...................................................................................... 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 10
REVISION HISTORY
8/06—Revision A: Initial Version
Power Factor Considerations.................................................... 10
Nonsinusoidal Voltage and Current........................................ 10
Applications..................................................................................... 12
Analog Inputs ............................................................................. 12
Power Supply Monitor............................................................... 13
Internal Oscillator (OSC).......................................................... 15
Transfer Function....................................................................... 15
Selecting a Frequency for an Energy Meter Application...... 16
No Load Threshold .................................................................... 17
Negative Power Information..................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. A | Page 2 of 20









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AD71056 Даташит, Описание, Даташиты
AD71056
SPECIFICATIONS
VDD = 5 V ± 5%, AGND = DGND = 0 V, on-chip reference, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C, TMIN to TMAX = −40°C to +85°C, unless
otherwise noted.
Table 1.
Parameter
ACCURACY1, 2
Measurement Error1 on Channel V1
Phase Error1 Between Channels
V1 Phase Lead 37°
V1 Phase Lag 60°
AC Power Supply Rejection1
Output Frequency Variation (CF)
DC Power Supply Rejection1
Output Frequency Variation (CF)
ANALOG INPUTS3
Channel V1 Maximum Signal Level
Channel V2 Maximum Signal Level
Input Impedance (DC)
Bandwidth (–3 dB)
ADC Offset Error1, 2
Gain Error1
OSCILLATOR FREQUENCY (OSC)
Oscillator Frequency Tolerance1
Oscillator Frequency Stability1
REFERENCE INPUT
REFIN/OUT Input Voltage Range
Input Capacitance
ON-CHIP REFERENCE
Reference Error
Temperature Coefficient
LOGIC INPUTS4
SCF, S0, S1
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN
LOGIC OUTPUTS4
F1 and F2
Output High Voltage, VOH
Output Low Voltage, VOL
CF
Output High Voltage, VOH
Output Low Voltage, VOL
Frequency Output Error1, 2(CF)
Value
0.1
Unit
% reading typ
±0.1 degrees max
±0.1 degrees max
0.2 % reading typ
±0.3 % reading typ
±30
±165
320
7
±18
±4
450
±12
±30
2.65
2.25
10
±200
±20
mV max
mV max
kΩ min
kHz nominal
mV max
% ideal typ
kHz nominal
% reading typ
ppm/°C typ
V max
V min
pF max
mV max
ppm/°C typ
Test Conditions/Comments
Channel V2 with full-scale signal (±165 mV), 25°C over a
dynamic range 500 to 1, line frequency = 45 Hz to 65 Hz
Power factor (PF) = 0.8 capacitive
PF = 0.5 inductive
S0 = S1 = 1, V1 = 21.2 mV rms, V2 = 116.7 mV rms @
50 Hz, ripple on VDD of 200 mV rms @ 100 Hz
S0 = S1 = 1, V1 = 21.2 mV rms, V2 = 116.7 mV rms,
VDD = 5 V ± 250 mV
V1P and V1N to AGND
V2P and V2N to AGND
OSC = 450 kHz, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C
OSC = 450 kHz, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C
External 2.5 V reference, V1 = 21.2 mV rms,
V2 = 116.7 mV rms
RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C
2.45 V nominal
2.45 V nominal
2.45 V nominal
2.4 V min
0.8 V max
±1 μA max
10 pF max
VDD = 5 V ± 5%
VDD = 5 V ± 5%
Typically 10 nA, VIN = 0 V to VDD
4.5 V min
0.5 V max
4 V min
0.5 V max
±10 % ideal typ
ISOURCE = 10 mA, VDD = 5 V, ISINK = 10 mA, VDD = 5 V
ISOURCE = 5 mA, VDD = 5 V, ISINK = 5 mA, VDD = 5 V
External 2.5 V reference, V1 = 21.2 mV rms,
V2 = 116.7 mV rms
Rev. A | Page 3 of 20










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