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AD712AQ Datasheet(PDF) 18 Page - Analog Devices

Part No. AD712AQ
Description  Dual Precision, Low Cost, High Speed BiFET Op Amp
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD712
Rev. G | Page 18 of 20
+15V
0.001µF
100kΩ
0.1µF
0.1µF
–15V
+15V
0.1µF
0.1µF
–15V
*
D
*
C
*
B
*
A
2800Ω
6190Ω
6490Ω
6190Ω
2800Ω
VIN
0.001µF
124kΩ
4.99kΩ
4.99kΩ
VOUT
4.9395E–15
5.9276E–15
5.9276E–15
4.9395E–15
*SEE TEXT
A1
AD711
A2
AD711
+
+
+
+
+
+
Figure 50. 9-Pole Chebychev Filter
9-POLE CHEBYCHEV FILTER
Figure 50 and Figure 51 show the AD712 and its dual
counterpart, the AD711, as a 9-pole Chebychev filter using
active frequency dependent negative resistors (FDNRs). With a
cutoff frequency of 50 kHz and better than 90 dB rejection, it
can be used as an antialiasing filter for a 12-bit data acquisition
system with 100 kHz throughput.
As shown in Figure 50, the filter is comprised of four FDNRs
(A, B, C, D) having values of 4.9395 × 10−15 and 5.9276 × 10–15
farad-seconds. Each FDNR active network provides a two-pole
response for a total of eight poles. The ninth pole consists of a
0.001 μF capacitor and a 124 kΩ resistor at Pin 3 of Amplifier A2.
Figure 51 depicts the circuits for each FDNR with the proper
selection of R. To achieve optimal performance, the 0.001 μF
capacitors must be selected for 1% or better matching and all
resistors should have 1% or better tolerance.
+15V
0.001µF
4.99kΩ
0.1µF
0.1µF
–15V
1.0kΩ
0.001µF
R
1/2
AD712
+
1/2
AD712
R: 24.9kΩ FOR 4.9395E–15
29.4kΩ FOR 5.9276E–15
+
Figure 51. FDNR for 9-Pole Chebychev Filter
REF 5.0dBm
10dB/DIV
RANGE –5.0dBm
MARKER 96 800.0Hz
–90dBm
START.0Hz
RBW 300Hz
STOP 200 000.0Hz
ST 69.6 SEC
VBW 30Hz
Figure 52. High Frequency Response for 9-Pole Chebychev Filter




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