參數(shù)資料
型號(hào)： 5962-8963701CX
廠商： ANALOG DEVICES INC
元件分類： 模擬專用變換器
英文描述： RMS TO DC CONVERTER, 0.15 MHz, CDIP14
封裝： CERDIP-14
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 515K
代理商： 5962-8963701CX
AD637
Rev. G | Page 12 of 20
Table 5. Practical Values of CAV and C2 for Various Input Waveforms
Recommended CAV and C2 Values
for 1% Averaging Error @ 60 Hz with T = 16.6 ms
Input Waveform
and Period
Absolute Value
Circuit Waveform
and Period
Minimum
R × CAV Time Constant
Recommended
Standard Value CAV
Recommended
Standard Value C2
1% Settling
Time
Symmetrical Sine Wave
A
0V
T
1/2T
1/2T
0.47 F
1.5 F
181 ms
Sine Wave with dc Offset
B
0V
T
T
0.82 F
2.7 F
325 ms
Pulse Train Waveform
C
T2
0V
T
T2
T
10 (T T2)
6.8 F
22 F
2.67 sec
D
T2
0V
T
T2
T
10 (T 2T2)
5.6 F
18 F
2.17 sec
FREQUENCY RESPONSE
The frequency response of the AD637 at various signal levels is
shown in Figure 15. The dashed lines show the upper frequency
limits for 1%, 10%, and ±3 dB of additional error. For example,
note that for 1% additional error with a 2 V rms input, the
highest frequency allowable is 200 kHz. A 200 mV signal can be
measured with 1% error at signal frequencies up to 100 kHz.
To take full advantage of the wide bandwidth of the AD637,
care must be taken in the selection of the input buffer amplifier.
To ensure that the input signal is accurately presented to the
converter, the input buffer must have a 3 dB bandwidth that is
wider than that of the AD637. Note the importance of slew rate
in this application. For example, the minimum slew rate
required for a 1 V rms, 5 MHz, sine wave input signal is
44 V/s. The user is cautioned that this is the minimum rising
or falling slew rate and that care must be exercised in the
selection of the buffer amplifier, since some amplifiers exhibit a
two-to-one difference between rising and falling slew rates. The
AD845 is recommended as a precision input buffer.
INPUT FREQUENCY (Hz)
10
1k
10M
10k
V
OUT
(
V)
100k
1M
1
0.1
0.01
1%
±3dB
10%
7V RMS INPUT
2V RMS INPUT
1V RMS INPUT
100mV RMS INPUT
00788-017
Figure 15. Frequency Response
AC MEASUREMENT ACCURACY AND CREST FACTOR
Crest factor is often overlooked in determining the accuracy of
an ac measurement. Crest factor is defined as the ratio of the peak
signal amplitude to the rms value of the signal (CF = Vp/V rms).
Most common waveforms, such as sine and triangle waves, have
relatively low crest factors (≤2). Waveforms that resemble low
duty cycle pulse trains, such as those occurring in switching
power supplies and SCR circuits, have high crest factors. For
example, a rectangular pulse train with a 1% duty cycle has a
crest factor of 10 (CF = 1 η ).
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