ADE7752 datasheet(14/24 Pages) AD

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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

IAP

VCM

–500mV

COMMON-MODE

±25mV MAX

IAN

IAP–IAN

DIFFERENTIAL INPUT

±500mV MAX PEAK

+500mV

AGND

VCM

VAP

VCM

–500mV

COMMON-MODE

±25mV MAX

VAP–VN

Figure 17. Maximum Signal Levels, Current Channel

Figure 18. Maximum Signal Levels, Voltage Channel

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