参数资料
型号: AD736BRZ
厂商: Analog Devices Inc
文件页数: 14/20页
文件大小: 0K
描述: IC TRUE RMS/DC CONV LP 8-SOIC
产品培训模块: Introduction to Analog RMS-to-DC Technology: Converters and Applications
标准包装: 1
电流 - 电源: 160µA
电源电压: 2.8V,-3.2V ~ ±16.5V
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 管件
配用: AD736-EVALZ-ND - BOARD EVALUATION FOR AD736
AD736
SELECTING PRACTICAL VALUES FOR INPUT
COUPLING (C C ), AVERAGING (C AV ), AND FILTERING
(C F ) CAPACITORS
Table 6 provides practical values of C AV and C F for several
common applications.
The input coupling capacitor, C C , in conjunction with the
8 k? internal input scaling resistor, determine the ?3 dB
low frequency roll-off. This frequency, F L , is equal to
Data Sheet
Note that at F L , the amplitude error is approximately ?30%
( – 3 dB) of the reading. To reduce this error to 0.5% of the
reading, choose a value of C C that sets F L at one-tenth of the
lowest frequency to be measured.
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 C C .
F L =
1
2π (8000)( Value of C C in Farads )
Table 6. Capacitor Selection Chart
Application
General-Purpose RMS Computation
General Purpose
Average
Responding
RMS Input Level
0 V to 1 V
0 mV to 200 mV
0 V to 1 V
0 mV to 200 mV
Low Frequency
Cutoff (?3 dB)
20 Hz
200 Hz
20 Hz
200 Hz
20 Hz
200 Hz
20 Hz
Max Crest
Factor
5
5
5
5
C AV
(μF)
150
15
33
3.3
None
None
None
C F
(μF)
10
1
10
1
33
3.3
33
Settling Time 1 to 1%
360 ms
36 ms
360 ms
36 ms
1.2 sec
120 ms
1.2 sec
200 Hz
None
3.3
120 ms
SCR Waveform Measurement
0 mV to 200 mV
0 mV to 100 mV
50 Hz
60 Hz
50 Hz
60 Hz
5
5
5
5
100
82
50
47
33
27
33
27
1.2 sec
1.0 sec
1.2 sec
1.0 sec
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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