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EVAL-ADE7755ZEB PDF预览

EVAL-ADE7755ZEB

更新时间: 2024-11-24 12:46:15
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亚德诺 - ADI 脉冲
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20页 457K
描述
Energy Metering IC with Pulse Output

EVAL-ADE7755ZEB 数据手册

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Energy Metering IC with Pulse Output  
ADE7755  
FEATURES  
GENERAL DESCRIPTION  
High accuracy, surpasses 50 Hz/60 Hz IEC 687/IEC 1036  
Less than 0.1% error over a dynamic range of 500 to 1  
The ADE7755 is a high accuracy electrical energy measurement  
IC. The part specifications surpass the accuracy requirements as  
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  
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.  
Direct drive for electromechanical counters and 2-phase  
stepper motors (F1 and F2)  
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.  
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  
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  
DD  
AV  
DV  
DD  
G0 G1  
16 15  
AGND  
DGND  
AC/DC  
3
11  
2
1
21  
ADE7755  
POWER  
SUPPLY MONITOR  
SIGNAL  
PROCESSING  
BLOCK  
PHASE  
CORRECTION  
5
6
V1P  
V1N  
...110101...  
ADC  
PGA  
×1, ×2, ×8, ×16  
HPF  
LPF  
MULTIPLIER  
8
7
V2P  
V2N  
...11011001...  
ADC  
DIGITAL-TO-FREQUENCY  
CONVERTER  
9
RESET  
4k  
2.5V  
REFERENCE  
10  
17  
18  
12  
14  
13  
20  
22  
24  
23  
REF  
CLKIN CLKOUT SCF S0 S1 REVP CF F1 F2  
IN/OUT  
Figure 1.  
1U.S. Patents 5,745,323; 5,760,617; 5,862,069; and 5,872,469.  
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 www.analog.com  
Fax: 781.461.3113 ©2002–2009 Analog Devices, Inc. All rights reserved.  
 

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