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ADE7761AARS-REF 参数 Datasheet PDF下载

ADE7761AARS-REF图片预览
型号: ADE7761AARS-REF
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:
文件页数/大小: 24 页 / 527 K
品牌: ADI [ ADI ]
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ADE7761A  
OPERATION  
V
1A  
1N  
DIFFERENTIAL INPUT A  
±660mV MAX PEAK  
POWER SUPPLY MONITOR  
V
, V  
1A 1B  
V1  
V1  
The ADE7761A continuously monitors the power supply (VDD)  
with its on-chip, power supply monitor. If the supply is less than  
4 V 5%, the ADE7761A goes into an inactive state, that is, no  
energy is accumulated and the CF, F1, and F2 outputs are  
disabled. This is useful to ensure correct device operation at  
power-up and during power-down. The power supply monitor  
has built-in hysteresis and filtering, which provides a high  
degree of immunity to false triggering due to noisy supplies.  
+660mV  
GAIN  
+ V  
CM  
V
COMMON MODE  
V
CM  
±100mV MAX  
V
CM  
AGND  
–660mV  
GAIN  
+ V  
CM  
DIFFERENTIAL INPUT B  
±660mV MAX PEAK  
V
1B  
Figure 12. Maximum Signal Levels, Channel 1  
Channel V2 (Voltage Channel)  
The power supply and decoupling for the part should be such  
that the ripple at VDD does not exceed 5 V 5% as specified for  
normal operation.  
The output of the line voltage transducer is connected to the  
ADE7761A at this analog input. Channel V2 is a single-ended,  
voltage input. The maximum peak differential signal on Channel 2  
is 660 mV with respect to V2N. Figure 13 shows the maximum  
signal levels that can be connected to Channel 2.  
V
DD  
5V  
4V  
V2  
V
2P  
+660mV + V  
CM  
V2  
DIFFERENTIAL INPUT  
±660mV MAX PEAK  
V
V
2N  
CM  
0V  
TIME  
V
COMMON MODE  
±100mV MAX  
CM  
–660mV + V  
CM  
ADE7761A  
REVP - FAULT - CF -  
F1 - F2 OUTPUTS  
INACTIVE  
ACTIVE  
INACTIVE  
Figure 11. On-Chip, Power Supply Monitoring  
Figure 13. Maximum Signal Levels, Channel 2  
ANALOG INPUTS  
Channel V1 (Current Channel)  
The differential voltage V2P − V2N must be referenced to a  
common mode (usually AGND). The analog inputs of the  
ADE7761A can be driven with common-mode voltages of up  
to 100 mV with respect to AGND. However, the best results  
are achieved using a common mode equal to AGND.  
The voltage outputs from the current transducers are connected  
to the ADE7761A at Channel V1. It has two voltage inputs, V1A  
and V1B. These inputs are fully differential with respect to V1N.  
However, at any one time, only one is selected to perform the  
power calculation (see the Fault Detection section).  
MISCAL Input  
The input for the power calibration in missing neutral mode  
is connected to the ADE7761A at this analog input. MISCAL is  
a single-ended, voltage input. It is recommended to use a dc  
signal derived from the voltage reference to drive this pin. The  
maximum peak differential signal on MISCAL is 660 mV with  
respect to V2N. Figure 14 shows the maximum signal levels that  
can be connected to the MISCAL pin.  
The maximum peak differential signal on V1A − V1N and V1B − V1N  
is 660 mV. However, Channel 1 has a programmable gain  
amplifier (PGA) with user-selectable gains of 1 or 16 (see  
Table 5). This gain facilitates easy transducer interfacing.  
Table 5. Channel 1 Dynamic Range  
PGA  
Gain  
Maximum Differential Signal (mV)  
MISCAL  
MISCAL  
MISCAL  
0
1
1
16  
660  
41  
+660mV + V  
CM  
CM  
DIFFERENTIAL INPUT  
±660mV MAX PEAK  
V
2N  
V
Figure 12 shows the maximum signal levels on V1A, V1B, and  
V1N. The maximum differential voltage is 660 mV divided by  
the gain selection. The differential voltage signal on the inputs  
must be referenced to a common mode (usually AGND).  
COMMON MODE  
±100mV MAX  
V
CM  
AGND  
Figure 14. Maximum Signal Levels, MISCAL  
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