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參數資料
| 型號： | AD636JD |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 10/17頁 |
| 文件大小： | 670K |
| 描述： | IC TRUE RMS/DC CONV MONO 14-CDIP |
| 產品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 25 |
| 電流 - 電源： | 800µA |
| 電源電壓： | ±2.5 V ~ 16 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 14-CDIP（0.300"，7.62mm） |
| 供應商設備封裝： | 14-CDIP |
| 包裝： | 管件 |
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD636JD/+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RMS-to-DC Converter |
| AD636JDZ | 功能描述:IC TRUE RMS/DC CONV MONO 14-CDIP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉換器 系列:- 標準包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:管件 |
| AD636JDZ | 制造商:Analog Devices 功能描述:IC, RMS-DC CONVERTER, 1%, 1.5MHZ, DIP-14 |
| AD636JH | 功能描述:其他電源管理 RMS/DC CONVERTER IC RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| AD636JHZ | 功能描述:IC CONV RMS-DC LOW LVL TO100-10 RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉換器 系列:- 標準包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:16-SOIC W 包裝:管件 |
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