ADE7569 datasheet(45/136 Pages) AD

45 / 136 page

Preliminary Technical Data

ADE7566/ADE7569

Rev. PrA | Page 45 of 136

The ADE7569 has a built-in digital integrator to recover the

current signal from the di/dt sensor. The digital integrator on

the current channel is switched off by default when the ADE7569

is powered up. Setting INTE bit in the MODE1 Register (0x0B)

turns on the integrator. Figure 38 to Figure 41 show the

magnitude and phase response of the digital integrator.

FREQUENCY (Hz)

–10

–20

–30

–40

–50

100

1000

Figure 38. Combined Gain Response of the Digital Integrator and

Phase Compensator

FREQUENCY (Hz)

102

103

FREQ

–88.0

–88.5

–89.0

–89.5

–90.0

–90.5

Figure 39. Combined Phase Response of the Digital Integrator and

Phase Compensator

FREQUENCY (Hz)

–1.0

–6.0

–1.5

–2.0

–2.5

–3.5

–4.5

–5.5

–3.0

–4.0

–5.0

Figure 40. Combined Gain Response of the Digital Integrator and

Phase Compensator (40 Hz to 70 Hz)

–89.75

–89.80

–89.85

–89.90

–89.95

–90.00

FREQUENCY (Hz)

–90.05

–89.70

Figure 41. Combined Phase Response of the Digital Integrator and

Phase Compensator (40 Hz to 70 Hz)

Note that the integrator has a−20 dB/dec attenuation and an

approximately −90° phase shift. When combined with a di/dt

sensor, the resulting magnitude and phase response should be a

flat gain over the frequency band of interest. The di/dt sensor

has a 20 dB/dec gain associated with it. It also generates

significant high frequency noise. Therefore, a more effective

anti-aliasing filter is needed to avoid noise due to aliasing (see

the Anti-Aliasing Filter section).

When the digital integrator is switched off, the ADE7569 can be

used directly with a conventional current sensor such as a current

transformer (CT) or with a low resistance current shunt.

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