ade7166 Analog Devices, Inc., ade7166 Datasheet - Page 52

• Manufacturer Part Number: ade7166
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

ADE7566/ADE7569/ADE7166/ADE7169
Figure 51. Combined Phase Response of the Digital Integrator and
Figure 52. Combined Gain Response of the Digital Integrator and
–88.0
–88.5
–89.0
–89.5
–90.0
–90.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5
–4.0
–4.5
–5.0
–5.5
–6.0
40
45
Phase Compensator (40 Hz to 70 Hz)
10
Phase Compensator
50
2
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQ
55
60
10
3
65
70
Rev. A | Page 52 of 144
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
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.
Antialiasing Filter section).
Figure 53. Combined Phase Response of the Digital Integrator and
–89.70
–89.75
–89.80
–89.85
–89.90
–89.95
–90.00
–90.05
40
Phase Compensator (40 Hz to 70 Hz)
45
50
FREQUENCY (Hz)
55
60
65
70