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PDF AD71056 Data sheet ( Hoja de datos )
| Número de pieza | AD71056 | |
| Descripción | Energy Metering IC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
4kΩ
...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.
1 page  
AD71056
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameter
VDD to AGND
VDD to DGND
Analog Input Voltage to AGND
V1P, V1N, V2P, and V2N
Reference Input Voltage to AGND
Digital Input Voltage to DGND
Digital Output Voltage to DGND
Operating Temperature Range
Storage Temperature Range
Junction Temperature
16-Lead Plastic SOIC, Power Dissipation
θJA Thermal Impedance1
Package Temperature Soldering
Rating
−0.3 V to +7 V
−0.3 V to +7 V
−6 V to +6 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−40°C to +85°C
−65°C to +150°C
150°C
350 mW
124.9°C/W
See J-STD-20
1 JEDEC 1S standard (2-layer) board data.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. A | Page 5 of 20
5 Page 
( )∞
i(t) = I0 +
2
×∑
h≠o
Ih
×
sin
hωt
+
βh
(3)
where:
i(t) is the instantaneous current.
I0 is the dc component.
Ih is the rms value of Current Harmonic h.
βh is the phase angle of the current harmonic.
Using Equation 2 and Equation 3, the real power, P, can be
expressed in terms of its fundamental real power (P1) and
harmonic real power (PH) as
P = P1 + PH
where:
P1 = V1 × I1 cos ϕ1
ϕ1 = α1 − β1
(4)
and PH
∞
PH = ∑Vh × Ih cos ϕh
h≠1
ϕh = αh − βh
(5)
AD71056
In Equation 5, a harmonic real power component is generated
for every harmonic, provided that harmonic is present in both
the voltage and current waveforms. The power factor calculation
has previously been shown to be accurate in the case of a pure
sinusoid. Therefore, the harmonic real power must also correctly
account for the power factor because it is made up of a series of
pure sinusoids.
Note that the input bandwidth of the analog inputs is 7 kHz at
the nominal internal oscillator frequency of 450 kHz.
Rev. A | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD71056.PDF ] | |
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