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AD637JD датащи(PDF) 10 Page - Analog Devices

номер детали AD637JD
подробное описание детали  High Precision, Wideband RMS-to-DC Converter
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD637JD датащи(HTML) 10 Page - Analog Devices

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AD637
Rev. K | Page 10 of 20
FOR A SINGLE-POLE
FILTER SHORT RX
AND REMOVE C3
1
25kΩ
DEN
INPUT
BUFF IN
BUFF
OUT
–VS
CS
dB OUTPUT
3COMMON
BIAS
2NC
4
OUTPUT
OFFSET
+VS
5
25kΩ
6
7
8
9
10
+VS
11
12
NC
13
14
RMS OUT
VIN
CAV
+
AD637
ABSOLUTE
VALUE
–VS
+VS
CAV
VIN
+
C2
4.7kΩ
C3
24kΩ
+
RX
24kΩ
SQUARER/
DIVIDER
INPUT FREQUENCY (Hz)
100
0.01
1
100k
10
100
1k
10k
10
1.0
0.1
100
0.01
10
1.0
0.1
*%dc ERROR + %RIPPLE (PEAK)
Figure 12. Values for CAV and 1% Settling Time for Stated % of Reading Averaging
Error* Accuracy Includes ±2% Component Tolerance (see * in Figure)
INPUT FREQUENCY (Hz)
100
0.01
1
100k
10
100
1k
10k
10
1
0.1
100
0.01
10
1
0.1
*%dc ERROR + %RIPPLE (PEAK)
ACCURACY ±20% DUE TO
COMPONENT TOLERANCE
Figure 11. 2-Pole Sallen-Key Filter
Figure 12 shows values of CAV and the corresponding averaging
error as a function of sine wave frequency for the standard rms
connection. The 1% settling time is shown on the right side of
Figure 12.
Figure 13 shows the relationship between the averaging error,
signal frequency settling time, and averaging capacitor value.
Figure 13 is drawn for filter capacitor values of 3.3× the
averaging capacitor value. This ratio sets the magnitude of the
ac and dc errors equal at 50 Hz. As an example, by using a 1 μF
averaging capacitor and a 3.3 μF filter capacitor, the ripple for
a 60 Hz input signal is reduced from 5.3% of the reading using
the averaging capacitor alone to 0.15% using the 1-pole filter.
This gives a factor of 30 reduction in ripple, and yet the settling
time only increases by a factor of 3. The values of filter
Capacitor CAV and Filter Capacitor C2 can be calculated for
the desired value of averaging error and settling time by using
Figure 13.
Figure 13. Values of CAV, C2, and 1% Settling Time for Stated % of Reading
Averaging Error* for 1-Pole Post Filter (see * in Figure)
INPUT FREQUENCY (Hz)
100
0.01
11
10
100
1k
10k
10
1
0.1
00k
100
0.01
10
1
0.1
*%dc ERROR + %RIPPLE (PEAK)
ACCURACY ±20% DUE TO
COMPONENT TOLERANCE
The symmetry of the input signal also has an effect on the
magnitude of the averaging error. Table 5 gives the practical
component values for various types of 60 Hz input signals.
These capacitor values can be directly scaled for frequencies
other than 60 Hz—that is, for 30 Hz, these values are doubled,
and for 120 Hz they are halved.
For applications that are extremely sensitive to ripple, the 2-pole
configuration is suggested. This configuration minimizes capacitor
values and the settling time while maximizing performance.
Figure 14. Values of CAV, C2, and C3 and 1% Settling Time for Stated % of
Reading Averaging Error* for 2-Pole Sallen-Key Filter (see * in Figure)
Figure 14 can be used to determine the required value of CAV,
C2, and C3 for the desired level of ripple and settling time.


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