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| 型号： | AD636JHZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/17页 |
| 文件大小： | 670K |
| 描述： | IC CONV RMS-DC LOW LVL TO100-10 |
| 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： | 800µA |
| 电源电压： | ±2.5 V ~ 16 V |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-100-10 金属罐 |
| 供应商设备封装： | TO-100-10 |
| 包装： | 散装 |
| 产品目录页面： | 786 (CN2011-ZH PDF) |
Data Sheet
AD636
Rev. E | Page 9 of 16
Figure 4 shows the value of REXTERNAL for a particular ratio of
VPEAK to VS for several values of RLOAD. The addition of
REXTERNAL increases the quiescent current of the buffer amplifier
by an amount equal to R
EXT
/V
S
. Nominal buffer quiescent
current with no R
EXTERNAL
is 30 礎 at V
S
= 5 V.
FREQUENCY RESPONSE
The AD636 uses a logarithmic circuit to perform the implicit rms
computation. As with any log circuit, bandwidth is proportional to
signal level. The solid lines in Figure 5 represent the frequency
response of the AD636 at input levels from 1 mV to 1 V rms.
The dashed lines indicate the upper frequency limits for 1%,
10%, and ? dB of reading additional error. For example, note
that a 1 V rms signal produces less than 1% of reading additional
error up to 220 kHz. A 10 mV signal can be measured with 1%
of reading additional error (100 礦) up to 14 kHz.
AC MEASUREMENT ACCURACY AND CREST
FACTOR (CF)
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 = V
P
/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/
?/DIV>
).
Figure 6 is a curve of reading error for the AD636 for a
200 mV rms input signal with crest factors from 1 to 7. A
rectangular pulse train (pulse width 200 約) was used for this
test because it is the worst-case waveform for rms measurement
(all the energy is contained in the peaks). The duty cycle and
peak amplitude were varied to produce crest factors from 1 to 7
while maintaining a constant 200 mV rms input amplitude.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD636JHZ | 制造商:Analog Devices 功能描述:IC, RMS-DC CONV, 1%, 1.5MHZ, TO-100-10 |
| AD636JN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:RMS-to-DC Converter |
| AD636JQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:RMS-to-DC Converter |
| AD636K | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Level, True RMS-to-DC Converter |
| AD636KCWE | 制造商:Maxim Integrated Products 功能描述: |
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