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ADE7752A Datasheet(PDF) 14 Page - Analog Devices

Part No. ADE7752A
Description  Polyphase Energy Metering IC with Pulse Output
Download  24 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADE7752A Datasheet(HTML) 14 Page - Analog Devices

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ADE7752/ADE7752A
Rev. C | Page 14 of 24
ANALOG INPUTS
CURRENT CHANNELS
VOLTAGE CHANNELS
The voltage outputs from the current transducers are connected
to the ADE7752 current channels, which are fully differential
voltage inputs. IAP, IBP, and ICP are the positive inputs for IAN,
IBN, and ICN, respectively.
The output of the line voltage transducer is connected to the
ADE7752 at this analog input. Voltage channels are a pseudo-
differential voltage input. VAP, VBP, and VCP are the positive
inputs with respect to VN.
The maximum peak differential signal on the current channel
should be less than ±500 mV (353 mV rms for a pure sinusoidal
signal) for the specified operation.
The maximum peak differential signal on the voltage channel
is ±500 mV (353 mV rms for a pure sinusoidal signal) for
specified operation.
Figure 17 illustrates the maximum signal levels on IAP and
IAN. The maximum differential voltage between IAP and IAN
is ±500 mV. The differential voltage signal on the inputs must
be referenced to a common mode, such as AGND. The maxi-
mum common-mode signal shown in
Figure 18 illustrates the maximum signal levels that can be
connected to the voltage channels of the ADE7752.
Voltage channels must be driven from a common-mode voltage.
In other words, the differential voltage signal on the input must
be referenced to a common mode (usually AGND). The analog
inputs of the ADE7752 can be driven with common-mode
voltages of up to 25 mV with respect to AGND. However, best
results are achieved using a common mode equal to AGND.
Figure 17 is ±25 mV.
DIFFERENTIAL INPUT
±500mV MAX PEAK
+500mV
AGND
VCM
IA
IAP
VCM
–500mV
COMMON-MODE
±25mV MAX
IAN
IAP–IAN
DIFFERENTIAL INPUT
±500mV MAX PEAK
+500mV
AGND
VCM
VA
VAP
VCM
–500mV
COMMON-MODE
±25mV MAX
VN
VAP–VN
Figure 17. Maximum Signal Levels, Current Channel
Figure 18. Maximum Signal Levels, Voltage Channel


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