參數(shù)資料
型號(hào)： AD536AKQ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/17頁(yè)
文件大?。?/td> 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
AD536A
Data Sheet
 
Rev. E | Page 12 of 16
C
AV
V
S
IN
V
OUT
+V
S
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V
S
+V
S
AD536A
25k&
25k&
ABSOLUTE
VALUE
SQUARER/
DIVIDER
CURRENT
MIRROR
R4
50k&
OFFSET
ADJUST
R3
750k&
R2
365&
BUF
NC
V
S
C
AV
+V
S
NC
NC
NC
dB
COM
BUF OUT
R
L
BUF IN
I
OUT
SCALE
FACTOR
ADJUST
R1
500&
 
Figure 16. Optional External Gain and Output Offset Trims
SINGLE-SUPPLY OPERATION
Refer to Figure 17 for single supply-rail configurations between
5 V and 36 V. When powered from a single supply, the input
stage (VIN pin) is internally biased at a voltage between ground
and the supply, and the input signal ac coupled. Biasing the
device between the supply and ground is simply a matter of
connecting the COM pin to an external resistor divider and
bypassing to ground. The resistor values are large, minimizing
power consumption, as the COM pin current is only 5 糀.
Note that the 10 k?and 20 k?resistors connected to the COM pin
(Figure 17) are asymmetrical, that is, the voltage at the COM pin is
1/3 of the supply. This ratio of input bias to supply is optimum
for the precision rectifier (aka absolute value circuit) input
circuit employed for rectifying ac input waveforms and ensures
full input symmetry for low signal voltages.
Capacitor C2 is required for AC input coupling, however an
external dc return is unnecessary because biasing occurs
internally. SelectC2 for the desired low frequency breakpoint
using an input resistance of 16.7 k?for the 1/蒖C calculation;
C2 = 1 糉 for a cutoff at 10 Hz. Figure 11 and Figure 12 show
the input and output signal ranges for dual and single supply
configurations, respectively. The load resistor, RL, provides a
path to sink output sink current when an input signal is
disconnected.
 
C
AV
V
IN
V
OUT
+V
S
14
13
12
11
10
9
8
1
2
3
4
5
6
7
AD536A
25k&
ABSOLUTE
VALUE
SQUARER/
DIVIDER
CURRENT
MIRROR
C2
1礔
ONPOLARIZED
R
L
0.1礔
20k&
10k&
0.1礔
10k&
TO
1k&
V
IN
NC
V
S
C
AV
+V
S
NC
NC
NC
dB
COM
BUF OUT
R
L
BUF IN
I
OUT
BUF
 
Figure 17. Single-Supply Connection
CHOOSING THE AVERAGING TIME CONSTANT
The AD536A computes the rms of both ac and dc signals. If the
input is a slowly varying dc signal, the output of the AD536A
tracks the input exactly.
At higher frequencies, the average output of the AD536A
approaches the rms value of the input signal. The actual output
of the AD536A differs from the ideal output by a dc (or average)
error and some amount of ripple, as shown in Figure 18.
DC ERROR = E
O
  E
O
 (IDEAL)
IDEAL E
O
DOUBLE FREQUENCY
RIPPLE
AVERAGE E
O
  E
O
O
TIME
 
Figure 18. Typical Output Waveform for Sinusoidal Input
The dc error is dependent on the input signal frequency and
the value of C
AV
. Use Figure 19 to determine the minimum value
of C
AV
, which yields a given percentage of dc error above a given
frequency using the standard rms connection.
The ac component of the output signal is the ripple. There are
two ways to reduce the ripple. The first method involves using a
large value of C
AV
. Because the ripple is inversely proportional
to C
AV
, a tenfold increase in this capacitance affects a tenfold
reduction in ripple.
When measuring waveforms with high crest factors, such as low
duty cycle pulse trains, the averaging time constant should be at
least 10 times the signal period. For example, a 100 Hz pulse
rate requires a 100 ms time constant, which corresponds to a
4 糉 capacitor (time constant = 25 ms per 糉).
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相關(guān)代理商/技術(shù)參數(shù)
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(kāi)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(kāi)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
AD536ASD883B 制造商:ANALOG DEV 功能描述:DIP-14PIN GOLD
AD536ASE 制造商:Rochester Electronics LLC 功能描述: 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:
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