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ADE7761A
Table 6. F 1–4 Frequency Selection
S1 S0 F 1–4 (Hz) 1
F 1?4 = OSC/2 n 2
Note that if the on-chip reference is used, actual output
frequencies can vary from device to device due to a reference
0
0
1.72
OSC/2 18
tolerance of ±8%.
0
1
1
1
0
1
3.44
6.86
13.7
OSC/2 17
OSC/2 16
OSC/2 15
F 1 ? F 2 Frequency =
5 . 70 × 0 . 66 × 0 . 66 × 1 . 72 Hz
2 × 2 × 2 . 5 2
= 0 . 34 Hz
1
2
Values are generated using the nominal frequency of 450 kHz.
F 1–4 are a binary fraction of the master clock and, therefore, vary with the
CF Frequency = F 1 ? F 2 × 64 = 22.0 Hz
internal oscillator frequency (OSC).
Frequency Output CF
The pulse output calibration frequency (CF) is intended for use
during calibration. The output pulse rate on CF can be up to
2048 times the pulse rate on F1 and F2. The lower the F 1–4
frequency selected, the higher the CF scaling. Table 7 shows
how the two frequencies are related, depending on the states of
As can be seen from these two example calculations, the
maximum output frequency for ac inputs is always half of that
for dc input signals. Table 8 shows a complete listing of all
maximum output frequencies for ac signals.
Table 8. Maximum Output Frequencies on CF, F1, and F2 for
AC Inputs
F1, F2 Maximum CF Maximum CF-to-
SCF  S1  S0  Frequency (Hz)   Frequency (Hz)  F1 Ratio
the logic inputs S0, S1, and SCF. Because of its relatively high
pulse rate, the frequency at this logic output is proportional to
the instantaneous active power. As with F1 and F2, the
frequency is derived from the output of the low-pass filter after
multiplication. However, because the output frequency is high,
this active power information is accumulated over a much
shorter time. Therefore, less averaging is carried out in the
digital-to-frequency conversion. With much less averaging of
the active power signal, the CF output is much more responsive
1
0
1
0
1
0
1
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0.34
0.34
0.68
0.68
1.36
1.36
2.72
2.72
43.52
21.76
43.52
21.76
43.52
21.76
43.52
5570
128
64
64
32
32
16
16
2048
to power fluctuations (see Figure 22).
Table 7. Relationship Between CF and F1, F2 Frequency
Outputs
SCF S1 S0 F 1–4 (Hz) CF Frequency Output
FAULT DETECTION
The ADE7761A incorporates a novel fault detection scheme
that warns of fault conditions and allows the ADE7761A to
continue accurate billing during a fault event. The ADE7761A
1
0
1
0
1
0
1
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1.72
1.72
3.44
3.44
6.86
6.86
13.7
13.7
128 × F1, F2
64 × F1, F2
64 × F1, F2
32 × F1, F2
32 × F1, F2
16 × F1, F2
16 × F1, F2
2048 × F1, F2
does this by continuously monitoring both the phase and
neutral (return) currents. A fault is indicated when these
currents differ by more than 6.25%. However, even during a
fault, the output pulse rate on F1 and F2 is generated using the
larger of the two currents. Because the ADE7761A looks for a
difference between the voltage signals on V 1A and V 1B , it is
important that both current transducers be closely matched.
On power-up, the output pulse rate of the ADE7761A is
Example
In this example, if ac voltages of ±660 mV peak are applied to
V1 and V2, then the expected output frequency on CF, F1, and
F2 is calculated as
Gain = 1, PGA = 0
F 1–4 = 1.7 Hz, SCF = S1 = S0 = 0
proportional to the product of the voltage signals on V 1A and
Channel 2. If the difference between V 1A and V 1B on power-up is
greater than 6.25%, the fault indicator (FAULT) becomes active
after about 1 sec. In addition, if V 1B is greater than V 1A , the
ADE7761A selects V 1B as the input. The fault detection is
automatically disabled when the voltage signal on Channel 1 is
less than 0.3% of the full-scale input range. This eliminates false
detection of a fault due to noise at light loads.
V1 rms = rms of 660 mV peak ac = 0.66/√2 V
V2 rms = rms of 660 mV peak ac = 0.66/√2 V
V REF = 2.5 V (nominal reference value)
Rev. 0 | Page 17 of 24
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相关代理商/技术参数
ADE7761ARS 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
ADE7761ARS-REF 制造商:Analog Devices 功能描述:ENERGY METER IC W/FAULT&MNEUT DETEC. - Bulk
ADE7761ARSRL 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection
ADE7761B 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection
ADE7761BARS 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
ADE7761BARS-REF 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection
ADE7761BARS-RL 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with On-Chip Fault and Missing Neutral Detection
ADE7761BARSZ 功能描述:IC ENERGY METERING 1PHASE 20SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 能量测量 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:*