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AD71056

更新时间: 2024-11-04 04:04:15
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亚德诺 - ADI 振荡器
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20页 412K
描述
Energy Metering IC with Integrated Oscillator and Reverse Polarity Indication

AD71056 数据手册

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Energy Metering IC with Integrated  
Oscillator and Reverse Polarity Indication  
AD71056  
FEATURES  
On-chip oscillator as clock source  
The AD71056 specifications surpass the accuracy requirements  
as quoted in the IEC62053-21 standard.  
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)  
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.  
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  
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.  
GENERAL DESCRIPTION  
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 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 part is available in a 16-lead, narrow body SOIC package.  
FUNCTIONAL BLOCK DIAGRAM  
V
AGND  
DGND  
13  
DD  
1
6
AD71056  
POWER  
SUPPLY MONITOR  
SIGNAL  
PROCESSING  
BLOCK  
V2P  
V2N  
2
3
...110101...  
+
+
Σ-Δ  
ADC  
MULTIPLIER  
PHASE  
CORRECTION  
LPF  
...11011001...  
4
5
V1N  
V1P  
Σ-Δ  
ADC  
Ф
HPF  
DIGITAL-TO-FREQUENCY  
CONVERTER  
INTERNAL  
OSCILLATOR  
4kΩ  
2.5V  
REFERENCE  
7
11  
8
10  
9
12  
14  
16  
15  
REF  
RCLKIN  
REVP CF  
F1  
S0  
SCF  
S1  
F2  
IN/OUT  
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.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 

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