Datasheet > AD736_12

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

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数据手册

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AD736_12 数据手册

AD736

Data Sheet

Note that at F_L, the amplitude error is approximately −30%

SELECTING PRACTICAL VALUES FOR INPUT

COUPLING (C_C), AVERAGING (C_AV), AND FILTERING

(C_F) CAPACITORS

(–3 dB) of the reading. To reduce this error to 0.5% of the

reading, choose a value of C_Cthat sets F_Lat one-tenth of the

lowest frequency to be measured.

Table 6 provides practical values of C_AVand C_Ffor 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 C_C.

The input coupling capacitor, C_C, in conjunction with the

8 kΩ internal input scaling resistor, determine the −3 dB

low frequency roll-off. This frequency, F_L, is equal to

F_L=

2π (8000)(Value of C_Cin Farads)

Table 6. Capacitor Selection Chart

Low Frequency

Cutoff (−3 dB)

Max Crest

Factor

C_AV

(µF)

C_F

Application

RMS Input Level

(µF) Settling Time¹to 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

150

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

0 mV to 200 mV

0 mV to 100 mV

SCR Waveform Measurement

Audio Applications

Speech

Music

0 mV to 200 mV

0 mV to 100 mV

300 Hz

20 Hz

1.5

100

0.5

18 ms

2.4 sec

¹Settling 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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