ADE7166_15 datasheet(56/152 Pages) AD

56 / 152 page

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

Rev. B | Page 56 of

152

FREQUENCY (Hz)

–1.0

–6.0

–1.5

–2.0

–2.5

–3.5

–4.5

–5.5

–3.0

–4.0

–5.0

The ADE7169/ADE7569 have 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 ADE7169/ADE7569 are powered up. Setting the INTE bit

(Bit 5) in the MODE1 register (Address 0x0B) turns on the

integrator. Figure 51 to Figure 54 show the gain and phase

response of the digital integrator.

FREQUENCY (Hz)

–10

–20

–30

–40

–50

100

1000

Figure 53. 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 51. 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 54. 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).

Figure 52. Combined Phase Response of the Digital Integrator and

Phase Compensator

When the digital integrator is switched off, the ADE7169/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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