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Preliminary Technical Data
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.
10
0
–10
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
ADE7566/ADE7569
–20
–6.0
40
45
50
55 60
65
70
FREQUENCY (Hz)
–30
–40
Figure 40. Combined Gain Response of the Digital Integrator and
Phase Compensator (40 Hz to 70 Hz)
–89.70
–89.75
–50
100
FREQUENCY (Hz)
1000
–89.80
Figure 38. Combined Gain Response of the Digital Integrator and
Phase Compensator
–88.0
–88.5
–89.85
–89.90
–89.95
–90.00
–90.05
–89.0
40
45
50
55 60
65
70
–89.5
–90.0
FREQUENCY (Hz)
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
–90.5
10 2
FREQUENCY (Hz)
10 3
sensor, the resulting magnitude and phase response should be a
flat gain over the frequency band of interest. The di/dt sensor
Figure 39. Combined Phase Response of the Digital Integrator and
Phase Compensator
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.
Rev. PrA | Page 45 of 136
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