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AD637KDZ 데이터시트(PDF) 7 Page - Analog Devices

부품명 AD637KDZ
상세설명  High Precision, Wideband RMS-to-DC Converter
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD637KDZ 데이터시트(HTML) 7 Page - Analog Devices

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AD637
Rev. K | Page 7 of 20
FUNCTIONAL DESCRIPTION
FILTER/AMPLIFIER
24kΩ
24kΩ
ONE QUADRANT
SQUARER/DIVIDER
BUFFER
AMPLIFIER
Q1
Q2
Q3
Q4
125Ω
6kΩ
6kΩ
12kΩ
24kΩ
A5
A1
A2
ABSOLUTE VALUE VOLTAGE TO
CURRENT CONVERTER
I1
I3
I4
A4
A3
BIAS
Q5
CAV
+VS
RMS
OUT
COMMON
CS
DEN
INPUT
OUTPUT
OFFSET
dB
OUTPUT
AD637
BUFF OUT
BUFF IN
–VS
14
1
13
10
4
6
5
3
7
9
11
8
VIN
Figure 4. Simplified Schematic
The AD637 embodies an implicit solution of the rms equation
that overcomes the inherent limitations of straightforward rms
computation. The actual computation performed by the AD637
follows the equation
=
rms
V
V
Avg
rms
V
IN
2
Figure 4 is a simplified schematic of the AD637, subdivided
into four major sections: absolute value circuit (active rectifier),
squarer/divider, filter circuit, and buffer amplifier. The input
voltage (VIN), which can be ac or dc, is converted to a unipolar
current I1 by the active rectifiers A1 and A2. I1 drives one input
of the squarer/divider, which has the transfer function
3
1
4
I
I
I
2
=
The output current of the squarer/divider I4 drives A4, forming
a low-pass filter with the external averaging capacitor. If the RC
time constant of the filter is much greater than the longest period
of the input signal, then the A4 output is proportional to the
average of I4. The output of this filter amplifier is used by A3
to provide the denominator current I3, which equals Avg I4 and
is returned to the squarer/divider to complete the implicit rms
computation
rms
I
I
I
Avg
I
1
4
1
4
=
=
2
and
VOUT = VIN rms
To compute the absolute value of the input signal, the averaging
capacitor is omitted. However, a small capacitance value at the
averaging capacitor pin is recommended to maintain stability;
5 pF is sufficient for this purpose. The circuit operates identically
to that of the rms configuration, except that I3 is now equal to
I4, giving
4
1
I
I 2
4
I =
I4 = |I1|
The denominator current can also be supplied externally by
providing a reference voltage (VREF) to Pin 6. The circuit operates
identically to the rms case, except that I3 is now proportional to
VREF. Therefore,
3
1
I
I
Avg
2
4
I =
and
DEN
IN
OUT
V
V
V
2
=
This is the mean square of the input signal.


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