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ADE7761BARS 参数 Datasheet PDF下载

ADE7761BARS图片预览
型号: ADE7761BARS
PDF下载: 下载PDF文件 查看货源
内容描述: 电能计量IC ,带有片上故障和中性丢失检测 [Energy Metering IC with On-Chip Fault and Missing Neutral Detection]
分类和应用: 模拟IC信号电路光电二极管
文件页数/大小: 24 页 / 528 K
品牌: ADI [ ADI ]
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ADE7761B  
TERMINOLOGY  
For the dc PSR measurement, a reading at nominal supplies (5 V)  
is taken. A second reading is obtained with the same input signal  
levels when the power supplies are varied 5%. Any error  
introduced is again expressed as a percentage of reading.  
Measurement Error  
The error associated with the energy measurement made by the  
ADE7761B is defined by  
Percentage Error =  
ADC Offset Error  
Energy Registered by ADE7761B True Energy  
This is the dc offset associated with the analog inputs to the ADCs.  
With the analog inputs connected to AGND, the ADCs still see  
a dc analog input signal. The magnitude of the offset depends on  
the input gain and range selection (see the Typical Performance  
Characteristics section). However, when HPFs are switched on,  
the offset is removed from the current channels and the power  
calculation is not affected by this offset.  
× 100%  
True Energy  
Phase Error Between Channels  
The high-pass filter (HPF) in the current channel has a phase  
lead response. To offset this phase response and equalize the  
phase response among channels, a phase correction network is  
also placed in the current channel. The phase correction network  
ensures a phase match between the current channels and the  
voltage channels to within 0.1° over a range of 45 Hz to  
65 Hz and 0.2° over a range of 40 Hz to 1 kHz.  
Gain Error  
The gain error in the ADE7761B ADCs is defined as the difference  
between the measured output frequency (minus the offset) and  
the ideal output frequency. It is measured with a gain of 1 in  
Channel V1A. The difference is expressed as a percentage of the  
ideal frequency, which is obtained from the transfer function  
(see the Transfer Function section).  
Power Supply Rejection (PSR)  
PSR quantifies the ADE7761B measurement error as a percentage  
of reading when the power supplies are varied. For the ac PSR  
measurement, a reading at nominal supplies (5 V) is taken.  
A second reading is obtained with the same input signal levels  
when an ac signal (175 mV rms/100 Hz) is introduced onto the  
supplies. Any error introduced by this ac signal is expressed as  
a percentage of reading (see the Measurement Error definition).  
Gain Error Match  
The gain error match is defined as the gain error (minus the offset)  
obtained when switching between a gain of 1 or 16. It is expressed  
as a percentage of the output ADC code obtained under a gain of 1.  
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