数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

AD736JR-REEL 数据表(PDF) 11 Page - Analog Devices

部件名 AD736JR-REEL
功能描述  Low Cost, Low Power, True RMS-to-DC Converter
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD736JR-REEL 数据表(HTML) 11 Page - Analog Devices

Back Button AD736JR-REEL Datasheet HTML 7Page - Analog Devices AD736JR-REEL Datasheet HTML 8Page - Analog Devices AD736JR-REEL Datasheet HTML 9Page - Analog Devices AD736JR-REEL Datasheet HTML 10Page - Analog Devices AD736JR-REEL Datasheet HTML 11Page - Analog Devices AD736JR-REEL Datasheet HTML 12Page - Analog Devices AD736JR-REEL Datasheet HTML 13Page - Analog Devices AD736JR-REEL Datasheet HTML 14Page - Analog Devices AD736JR-REEL Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 20 page
background image
Data Sheet
AD736
Rev. I | Page 11 of 20
Mathematically, the rms value of a voltage is defined (using a
simplified equation) as
( )2
rms
V
Avg
V
=
This involves squaring the signal, taking the average, and
then obtaining the square root. True rms converters are smart
rectifiers; they provide an accurate rms reading regardless of the
type of waveform being measured. However, average responding
converters can exhibit very high errors when their input signals
deviate from their precalibrated waveform; the magnitude of
the error depends on the type of waveform being measured. For
example, if an average responding converter is calibrated to
measure the rms value of sine wave voltages and then is used to
measure either symmetrical square waves or dc voltages, the
converter has a computational error 11% (of reading) higher
than the true rms value (see Table 5).
CALCULATING SETTLING TIME USING FIGURE 16
Figure 16 can be used to closely approximate the time required
for the AD736 to settle when its input level is reduced in amplitude.
The net time required for the rms converter to settle is the
difference between two times extracted from the graph (the
initial time minus the final settling time). As an example, consider
the following conditions: a 33 µF averaging capacitor, a 100 mV
initial rms input level, and a final (reduced) 1 mV input level.
From Figure 16, the initial settling time (where the 100 mV line
intersects the 33 µF line) is approximately 80 ms.
The settling time corresponding to the new or final input level
of 1 mV is approximately 8 seconds. Therefore, the net time for
the circuit to settle to its new value is 8 seconds minus 80 ms,
which is 7.92 seconds. Note that because of the smooth decay
characteristic inherent with a capacitor/diode combination, this
is the total settling time to the final value (that is, not the settling
time to 1%, 0.1%, and so on, of the final value). In addition, this
graph provides the worst-case settling time because the AD736
settles very quickly with increasing input levels.
RMS MEASUREMENT—CHOOSING THE OPTIMUM
VALUE FOR CAV
Because the external averaging capacitor, CAV, holds the
rectified input signal during rms computation, its value directly
affects the accuracy of the rms measurement, especially at low
frequencies. Furthermore, because the averaging capacitor
appears across a diode in the rms core, the averaging time
constant increases exponentially as the input signal is reduced.
This means that as the input level decreases, errors due to
nonideal averaging decrease, and the time required for the
circuit to settle to the new rms level increases. Therefore, lower
input levels allow the circuit to perform better (due to increased
averaging) but increase the waiting time between measurements.
Obviously, when selecting CAV, a trade-off between computational
accuracy and settling time is required.
Table 5. Error Introduced by an Average Responding Circuit when Measuring Common Waveforms
Waveform Type 1 V Peak Amplitude
Crest Factor
(VPEAK/V rms)
True RMS
Value (V)
Average Responding Circuit
Calibrated to Read RMS Value of
Sine Waves (V)
% of Reading Error Using
Average Responding Circuit
Undistorted Sine Wave
1.414
0.707
0.707
0
Symmetrical Square Wave
1.00
1.00
1.11
+11.0
Undistorted Triangle Wave
1.73
0.577
0.555
−3.8
Gaussian Noise (98% of Peaks <1 V)
3
0.333
0.295
−11.4
Rectangular
2
0.5
0.278
−44
Pulse Train
10
0.1
0.011
−89
SCR Waveforms
50% Duty Cycle
2
0.495
0.354
−28
25% Duty Cycle
4.7
0.212
0.150
−30


类似零件编号 - AD736JR-REEL

制造商部件名数据表功能描述
logo
Analog Devices
AD736JR-REEL AD-AD736JR-REEL Datasheet
218Kb / 8P
   Low Cost, Low Power, True RMS-to-DC Converter
REV. C
AD736JR-REEL-7 AD-AD736JR-REEL-7 Datasheet
218Kb / 8P
   Low Cost, Low Power, True RMS-to-DC Converter
REV. C
More results

类似说明 - AD736JR-REEL

制造商部件名数据表功能描述
logo
Analog Devices
AD8436 AD-AD8436_13 Datasheet
747Kb / 24P
   Low Cost, Low Power, True RMS-to-DC Converter
REV. B
AD737 AD-AD737 Datasheet
149Kb / 8P
   Low Cost, Low Power, True RMS-to-DC Converter
REV. C
AD736 AD-AD736_15 Datasheet
480Kb / 20P
   Low Cost, Low Power, True RMS-to-DC Converter
Rev. I
AD737 AD-AD737_15 Datasheet
499Kb / 24P
   Low Cost, Low Power, True RMS-to-DC Converter
Rev. I
AD8436 AD-AD8436_17 Datasheet
762Kb / 21P
   Low Cost, Low Power, True RMS-to-DC Converter
AD736 AD-AD736 Datasheet
218Kb / 8P
   Low Cost, Low Power, True RMS-to-DC Converter
REV. C
AD737 AD-AD737_12 Datasheet
499Kb / 24P
   Low Cost, Low Power, True RMS-to-DC Converter
Rev. I
logo
Burr-Brown (TI)
4341 BURR-BROWN-4341 Datasheet
331Kb / 4P
   LOW COST TRUE RMS-TO-DC CONVERTER
logo
Analog Devices
AD636 AD-AD636 Datasheet
157Kb / 8P
   Low Level, True RMS-to-DC Converter
REV. B
AD636 AD-AD636_15 Datasheet
677Kb / 17P
   Low Level, True RMS-to-DC Converter
Rev. E
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com