ADE7752B datasheet(15/27 Pages) AD

15 / 27 page

Preliminary Technical Data

ADE7752B

Rev. PrA | Page 15 of 27

ANALOG INPUTS

CURRENT CHANNELS

The voltage outputs from the current transducers are connected

to the ADE7752B current channels, which are fully differential

voltage inputs. IAP, IBP, and ICP are the positive inputs for IAN,

IBN, and ICN, respectively.

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.

DIFFERENTIAL INPUT

±500mV MAX PEAK

+500mV

AGND

VCM

IAP

VCM

–500mV

COMMON-MODE

±25mV MAX

IAN

IAP–IAN

Figure 17. Maximum Signal Levels, Current Channel

The maximum signal levels on IAP and IAN are shown in

Figure 17. 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, for example, AGND.

The maximum common-mode signal shown in Figure 17 is

±25 mV.

VOLTAGE CHANNELS

The output of the line voltage transducer is connected to the

ADE7752B 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 voltage channel is

±500 mV (353 mV rms for a pure sinusoidal signal) for speci-

fied operation.

Figure 18 illustrates the maximum signal levels that can be

connected to the ADE7752B voltage channels.

DIFFERENTIAL INPUT

±500mV MAX PEAK

+500mV

AGND

VCM

VAP

VCM

–500mV

COMMON-MODE

±25mV MAX

VAP–VN

Figure 18. Maximum Signal Levels, Voltage Channel

Voltage channels must be driven from a common-mode voltage,

that is, the differential voltage signal on the input must be refer-

enced to a common mode (usually AGND). The analog inputs

of the ADE7752B 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.

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