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參數(shù)資料
| 型號： | AD7755 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Energy Metering IC with Pulse Output(帶脈沖輸出的高精度電子能量測量芯片) |
| 中文描述： | 電能計量IC脈沖輸出（帶脈沖輸出的高精度電子能量測量芯片） |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 260K |
| 代理商： | AD7755 |
PRELIMINARY TECHNICAL DATA
AD7755
11
PRELIM B2 10/98
As can be seen in the diagram, the frequency output CF is seen
to vary over time, even under steady load conditions. This
frequency variation is primarily due to the Cos(2
ω
.t) compo-
nent in the instantaneous real power signal. The output
frequency on CF can be up to 2048 times higher than the
frequency on F1 and F2. This higher output frequency is
generated by accumulating the instantaneous real power signal
over a much shorter time while converting it to a frequency.
This shorter accumulation period means less averaging of the
Cos(2
ω
.t) component. As a consequence some of this instanta-
neous power signal passes through the Digital to Frequency
conversion. This will not be a problem in the application—see
Meter Calibration. Because the outputs F1 and F2 operate at a
much lower frequency, a lot more averaging of the instanta-
neous real power signal is carried out. The result is a greatly
attenuated sinusoidal content and a virtually ripple free
frequency output.
Frequency Outputs
Figure 9 below shows the waveforms of the various frequency
outputs. The outputs F1 and F2 are the low frequency outputs
which can be used to directly drive a stepper motor or electro-
mechanical impulse counter. The F1 and F2 outputs provide
two alternating low going pulses. The pulse width (t
) is set at
275ms and the time between the falling edges of F1 and F2 (t
3
)
is approximately half the period of F1 (t
2
) . If however the
period of F1 and F2 falls below 550ms (1.81Hz) the pulse
width of F1 and F2 is set to half of their period.
The High frequency CF output is intended to be used for
communications and calibration purposes. CF produces a
90ms wide active high pulse (t
) at a frequency which is
proportional to the product of Channel 1 and Channel 2 . The
output frequencies are given in Table III. As in the case of F1
and F2, if the period of CF (t
) falls below 180ms then the CF
pulse width is set to half the period. For example if the CF
frequency is 20Hz then the CF pulse width is 25ms.
Figure 9. Timing Diagram for Frequency outputs
t5
t4
t3
t2
t6
t1
CF
F1
F2
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|---|---|
| AD7755AAN | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Bulk |
| AD7755AAN-REF | 制造商:Analog Devices 功能描述: |
| AD7755AARS | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Bulk 制造商:Analog Devices 功能描述: |
| ad7755aarsrl | 制造商:Rochester Electronics LLC 功能描述:ENERGY METERING IC WITH P - Tape and Reel 制造商:Analog Devices 功能描述: |
| AD7755ABRS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Energy Metering IC with Pulse Output |
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