ADE5569 datasheet(48/148 Pages) AD

48 / 148 page

ADE5166/ADE5169/ADE5566/ADE5569

Preliminary Technical Data

Rev. PrB | Page 48 of 148

FREQUENCY (Hz)

102

103

FREQ

–88.0

–88.5

–89.0

–89.5

–90.0

–90.5

Figure 30. 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 31. 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 32. 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 antialiasing

filter is needed to avoid noise due to aliasing (see the Antialiasing

Filter section).

When the digital integrator is switched off, the ADE5569/ADE5169

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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