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

X  

AD8436JCPZ-WP 数据表(PDF) 10 Page - Analog Devices

部件名 AD8436JCPZ-WP
功能描述  Low Cost, Low Power
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

AD8436JCPZ-WP 数据表(HTML) 10 Page - Analog Devices

Back Button AD8436JCPZ-WP Datasheet HTML 6Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 7Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 8Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 9Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 10Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 11Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 12Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 13Page - Analog Devices AD8436JCPZ-WP Datasheet HTML 14Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 20 page
background image
AD8436
Rev. 0 | Page 10 of 20
THEORY OF OPERATION
OVERVIEW
The AD8436 is an implicit function rms-to-dc converter that
renders a dc voltage dependent on the rms (heating value) of an
ac voltage. In addition to the basic converter, this highly integrated
functional circuit block includes two fully independent, optional
amplifiers, a standalone FET input buffer amplifier and a precision
dc output buffer amplifier (see Figure 1). The rms core includes
a precision current responding full-wave rectifier and a log-antilog
transistor array for current squaring and square rooting to imple-
ment the classic expression for rms (see Equation 1). For basic
applications, the converter requires only an external capacitor, for
averaging (see Figure 30). The optional on-board amplifiers
offer utility and flexibility in a variety of applications without
incurring additional circuit board footprint. For lowest power,
the amplifier supply pins are left unconnected.
Why RMS?
The rms value of an ac voltage waveform is equal to the dc voltage
providing the same heating power to a load. A common measure-
ment technique for ac waveforms is to rectify the signal in a
straightforward way using a diode array of some sort, resulting in
the average value. The average value of various waveforms (sine,
square, and triangular, for example) varies widely; true rms is
the only metric that achieves equivalency for all ac waveforms.
See Table 5 for non-rms-responding circuit errors.
The acronym “rms” means root-mean-square and reads as follows:
“the square root of the average of the sum of the squares” of the
peak values of any waveform. RMS is shown in the following
equation:
(1)
For additional information, select Section I of the 2nd edition of
the Analog Devices RMS-to-DC Applications Guide.
RMS Core
The core consists of a voltage-to-current converter (precision
resistor), absolute value, and translinear sections. The translinear
section exploits the properties of the bipolar transistor junctions
for squaring and root extraction (see Figure 23). The external
capacitor (CAVG) provides for averaging the product. Figure 19
shows that there is no effect of signal input on the transition times,
as seen in the dc output. Although the rms core responds to input
voltages, the conversion process is current sensitive. If the rms
input is ac-coupled, as recommended, there is no output offset
voltage, as reflected in Table 1. If the rms input is dc-coupled, the
input offset voltage is reflected in the output and can be calibrated
as with any fixed error.
V–
AC IN
V+
OUT
+
V+
5kΩ
CAVG
ABSOLUTE
VALUE
CIRCUIT
V-TO-I
16kΩ
Figure 23. RMS Core Block Diagram
Table 5. General AC Parameters
Waveform Type (1 V p-p)
Crest Factor
RMS Value
Reading of an Average Value Circuit
Calibrated to an RMS Sine Wave
Error (%)
Sine
1.414
0.707
0.707
0
Square
1.00
1.00
1.11
11.0
Triangle
1.73
0.577
0.555
−3.8
Noise
3
0.333
0.295
Rectangular
2
0.5
0.278
−11.4
Pulse
10
0.1
0.011
−44
SCR
−89
DC = 50%
2
0.495
0.354
−28
DC = 25%
4.7
0.212
0.150
−30


类似零件编号 - AD8436JCPZ-WP

制造商部件名数据表功能描述
logo
Analog Devices
AD8436JCPZ-WP AD-AD8436JCPZ-WP Datasheet
747Kb / 24P
   Low Cost, Low Power, True RMS-to-DC Converter
REV. B
AD8436JCPZ-WP AD-AD8436JCPZ-WP Datasheet
762Kb / 21P
   Low Cost, Low Power, True RMS-to-DC Converter
More results

类似说明 - AD8436JCPZ-WP

制造商部件名数据表功能描述
logo
Intersil Corporation
X9116 INTERSIL-X9116 Datasheet
247Kb / 9P
   Low Noise, Low Power, Low Cost
logo
Analog Devices
AD73311L AD-AD73311L_17 Datasheet
411Kb / 37P
   Low Cost, Low Power CMOS
AD620 AD-AD620_04 Datasheet
788Kb / 20P
   Low Cost Low Power Instrumentation Amplifier
Rev. G
AD620 AD-AD620_05 Datasheet
788Kb / 20P
   Low Cost Low Power Instrumentation Amplifier
Rev. G
AD620 AD-AD620 Datasheet
571Kb / 16P
   Low Cost, Low Power Instrumentation Amplifier
REV. E
logo
List of Unclassifed Man...
SAM3703 ETC1-SAM3703 Datasheet
253Kb / 30P
   LOW POWER LOW COST EFFECT PROCESSOR
logo
Rhombus Industries Inc.
L-467 RHOMBUS-IND-L-467 Datasheet
39Kb / 1P
   LOW COST POWER INDUCTOR
logo
Nuvotem Talema
DPO-0.5-470 TALEMA-DPO-0.5-470 Datasheet
105Kb / 4P
   Low Cost Power Inductors
logo
Analog Devices
AD620 AD-AD620_15 Datasheet
643Kb / 21P
   Low Cost Low Power Instrumentation Amplifier
Rev. H
logo
JSC ALFA.
AS620 ALFA-AS620 Datasheet
309Kb / 4P
   Low Cost Low Power Instrumentation Amplifier
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