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AD736_12 PDF预览

AD736_12

更新时间: 2024-01-29 00:04:50
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
20页 480K
描述
Low Cost, Low Power, True RMS-to-DC Converter

AD736_12 数据手册

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AD736  
Data Sheet  
Note that at FL, the amplitude error is approximately −30%  
SELECTING PRACTICAL VALUES FOR INPUT  
COUPLING (CC), AVERAGING (CAV), AND FILTERING  
(CF) CAPACITORS  
(3 dB) of the reading. To reduce this error to 0.5% of the  
reading, choose a value of CC that sets FL at one-tenth of the  
lowest frequency to be measured.  
Table 6 provides practical values of CAV and CF for several  
common applications.  
In addition, if the input voltage has more than 100 mV of dc  
offset, then the ac-coupling network shown in Figure 27 should  
be used in addition to CC.  
The input coupling capacitor, CC, in conjunction with the  
8 kΩ internal input scaling resistor, determine the −3 dB  
low frequency roll-off. This frequency, FL, is equal to  
1
FL =  
2π (8000)(Value of CC in Farads)  
Table 6. Capacitor Selection Chart  
Low Frequency  
Cutoff (−3 dB)  
Max Crest  
Factor  
CAV  
(µF)  
CF  
Application  
RMS Input Level  
(µF) Settling Time1 to 1%  
General-Purpose RMS Computation  
0 V to 1 V  
20 Hz  
200 Hz  
20 Hz  
200 Hz  
20 Hz  
200 Hz  
20 Hz  
200 Hz  
50 Hz  
60 Hz  
50 Hz  
60 Hz  
5
5
5
5
150  
15  
33  
10  
1
10  
1
360 ms  
36 ms  
360 ms  
36 ms  
1.2 sec  
120 ms  
1.2 sec  
120 ms  
1.2 sec  
1.0 sec  
1.2 sec  
1.0 sec  
0 mV to 200 mV  
0 V to 1 V  
3.3  
General Purpose  
Average  
Responding  
None 33  
None 3.3  
None 33  
None 3.3  
100  
82  
0 mV to 200 mV  
0 mV to 200 mV  
0 mV to 100 mV  
SCR Waveform Measurement  
5
5
5
5
33  
27  
33  
27  
50  
47  
Audio Applications  
Speech  
Music  
0 mV to 200 mV  
0 mV to 100 mV  
300 Hz  
20 Hz  
3
10  
1.5  
100  
0.5  
68  
18 ms  
2.4 sec  
1 Settling time is specified over the stated rms input level with the input signal increasing from zero. Settling times are greater for decreasing amplitude input signals.  
Rev. I | Page 14 of 20  
 
 

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