ADE7761AARS-REF datasheet(20/24 Pages) AD

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ADE7761A

Rev. 0 | Page 20 of 24

Missing Neutral Gain Calibration

Example

When the ADE7761A is in missing neutral mode, the energy is

bill based on the active current input signal level. The frequency

outputs in this mode can be calibrated with the MISCAL analog

input pin. In this mode, applying a dc voltage of 330 mV on

MISCAL is equivalent to applying, in normal mode, a pure sine

wave on the voltage input with a peak value of 330 mV. The

MISCAL input can vary from 0 V to 660 mV (see the Analog

Inputs section). When set to 0 V, the frequency outputs are

close to zero. When set to 660 mV dc, the frequency outputs are

twice that when MISCAL is at 330 mV dc. In other words,

Equation 7 can be used in missing neutral mode by replacing

V2rms by MISCALrms /√2.

In normal mode, ac voltages of ±330 mV peak are applied to V1

and V2, and then the expected output frequency on F1 and F2 is

calculated as:

Gain =1 ; PGA =0

F1–4 = 1.7 Hz, SCF = S1 = S0 = 0

V1 = rms of 330 mV peak ac = 0.33/√2 V

V2 = rms of 330 mV peak ac = 0.33/√2 V

VREF = 2.5 V (nominal reference value)

084

Frequency

REF

rms

MISCAL

Gain

Frequency

−

(8)

CF Frequency = F1 − F2 Frequency × 64 = 5.4 Hz

In missing neutral mode, the ac voltage of ±330 mV peak is

applied to V1, no signal is connected on V2, and a 330 mV dc

input is applied to MISCAL. With the ADE7761A in the same

configuration as the previous example, the expected output

frequencies on CF, F1, and F2 are

where:

F1, F2 Frequency is the output frequency on F1 and F2 (Hz).

V1rms is the differential rms voltage signal on Channel 1 (V).

MISCALrms is the differential rms voltage signal on the MISCAL

pin (V).

084

Frequency

Gain is 1 or 16, depending on the PGA gain selection made

using logic input PGA.

CF Frequency = F1, F2 Frequency × 64 = 5.4 Hz

VREF is the reference voltage (2.5 V ± 8%) (V).

F1-4 is one of four possible frequencies selected by using the

logic inputs S0 and S1 (see Table 6).

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