參數(shù)資料
型號： AD536AKQ
廠商： Analog Devices Inc
文件頁數(shù)： 10/17頁
文件大小： 552K
描述： IC TRUE RMS/DC CONV 14CDIP
產(chǎn)品變化通告： Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 25
電流 - 電源： 1.2mA
電源電壓： 5.0V ~ 36V，±3.0V ~ 18V
安裝類型： 通孔
封裝/外殼： 14-CDIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 14-CERDIP
包裝： 管件
Data Sheet
AD536A
 
Rev. E | Page 9 of 16
14
13
12
11
10
9
8
1
2
3
4
5
6
7
AD536A
25k&
ABSOLUTE
VALUE
SQUARER/
DIVIDER
CURRENT
MIRROR
BUF
V
IN
NC
V
S
C1, C
AV
C
AV
C2
+V
S
NC
NC
NC
dB
COM
R
L
I
OUT
+V
S
4.6V TO 18V
E
OUT
E
+E
2.5V
OP77
AD580J
R1
500k&
0dB
REF
ADJUST
dB SCALE
FACTOR ADJUST
TEMPERATURE
COMPENSATED
dB OUTPUT
+100mV/dB
V
S
+V
S
V
S
+V
S
dB OUT
3mV/dB
SPECIAL TC COMPENSATION RESISTOR, +3300ppm/癈,
PRECISION RESISTOR COMPANY PART NUMBER AT 35 OR PART NUMBER ST35.
LINEAR
rms
OUTPUT
R6
24.9k&
R3
60.4&
R2
1
1k&
R4
33.2k&
R5
5k&
BUF OUT
BUF IN
0.1礔
7
4
3
6
2
 
Figure 7. dB Connection
FREQUENCY RESPONSE
The AD536A utilizes a logarithmic circuit in performing the
implicit rms computation. As with any log circuit, bandwidth
is proportional to signal level. The solid lines in the graph of
Figure 8 represent the frequency response of the AD536A at
input levels from 10 mV rms to 7 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 120 kHz. A 10 mV
signal can be measured with 1% of reading additional error
(100 礦) up to only 5 kHz.
100k
1M
10M
1k
10k
10
1
0.1
0.01
1%
10%
?dB
FREQUENCY Hz
7Vrms INPUT
1Vrms INPUT
100mVrms INPUT
10mVrms INPUT
 
Figure 8. High Frequency Response
AC MEASUREMENT ACCURACY AND CREST
FACTOR
Crest factor is often overlooked when determining the accuracy
of an ac measurement. The definition of crest factor is 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 = 1n).
Figure 9 illustrates a curve of reading error for the AD536A for
a 1 V rms input signal with crest factors from 1 to 11. A rectan-
gular pulse train (pulse width = 100 祍) was used for this test
because it is the worst-case waveform for rms measurement (all
of the energy is contained in the peaks). The duty cycle and
peak amplitude were varied to produce crest factors from 1 to
11 while maintaining a constant 1 V rms input amplitude.
?= DUTY CYCLE =
CF = 1/?/DIV>
?/DIV>
IN
 (rms) = 1 V rms
100祍
T
?/DIV>
O
V
P
0
100祍
T
1
0
1
2
3
4
1   2   3   4   5   6   7   8   9   10  11
CREST FACTOR
 
Figure 9. Error vs. Crest Factor
1祍   10祍   100祍  1000祍
PULSEWIDTH(祍)
10
1
0.1
1VrmsCF=3
1VrmsCF=10
 
Figure 10. Error vs. Pulse Width Rectangular Pulse
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參數(shù)描述
AD536ASCHIPS 制造商:AD 制造商全稱:Analog Devices 功能描述:Integrated Circuit True RMS-to-DC Converter
AD536ASD 功能描述:IC TRUE RMS/DC CONV 14-CDIP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件
AD536ASD/883B 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RMS/DC CONVERTER IC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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