ADE7566 datasheet(52/144 Pages) AD

52 / 144 page

ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 52 of 144

FREQUENCY (Hz)

102

103

FREQ

–88.0

–88.5

–89.0

–89.5

–90.0

–90.5

–89.75

–89.80

–89.85

–89.90

–89.95

–90.00

FREQUENCY (Hz)

–90.05

–89.70

Figure 53. Combined Phase Response of the Digital Integrator and

Phase Compensator (40 Hz to 70 Hz)

Figure 51. Combined Phase Response of the Digital Integrator and

Phase Compensator

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

antialiasing filter is needed to avoid noise due to aliasing (see

the

FREQUENCY (Hz)

–1.0

–6.0

–1.5

–2.0

–2.5

–3.5

–4.5

–5.5

–3.0

–4.0

–5.0

Antialiasing Filter section).

When the digital integrator is switched off, the ADE7569/ADE7169

can be used directly with a conventional current sensor such as a

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

Figure 52. Combined Gain Response of the Digital Integrator and

Phase Compensator (40 Hz to 70 Hz)

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