参数资料
型号: AD711JRZ
厂商: ANALOG DEVICES INC
元件分类: 运算放大器
英文描述: Precision, Low Cost, High Speed, BiFET Op Amp
中文描述: OP-AMP, 3000 uV OFFSET-MAX, 4 MHz BAND WIDTH, PDSO8
封装: ROHS COMPLIANT, PLASTIC, MS-012AA, SOIC-8
文件页数: 4/16页
文件大小: 711K
代理商: AD711JRZ
REV. E
AD711
–12–
+15V
–15V
0.1 F
A1
AD711
VIN
VOUT
+15V
–15V
0.1 F
A2
AD711
A
*
B
*
C
*
D
*
0.001 F
4.9395E–15
5.9276E–15
4.9395E–15
2800
6190
6490
6190
0.001
F
100k
124k
2800
*SEE TEXT
4.99k
Figure 17. 9-Pole Chebychev Filter
+15V
–15V
0.1 F
1/2
AD712
1/2
AD712
0.001 F
R
1k
4.99k
R: 24.9k
FOR 4.9395E–15
29.4k
FOR 5.9276E–15
Figure 18. FDNR for 9-Pole Chebychev Filter
Figure 19. High Frequency Response for 9-Pole
Chebychev Filter
9-POLE CHEBYCHEV FILTER
Figure 17 shows the AD711 and its dual counterpart, the AD712,
as a 9-pole Chebychev filter using active frequency dependent
negative resistors (FDNR). With a cutoff frequency of 50 kHz
and better than 90 dB rejection, it may be used as an anti-aliasing
filter for a 12-bit data acquisition system with 100 kHz throughput.
As shown in Figure 17, 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
2-pole response; for a total of 8 poles. The 9th pole consists of a
0.001
mF capacitor and a 124 kW resistor at Pin 3 of amplifier A2.
Figure 18 depicts the circuits for each FDNR with the proper
selection of R. To achieve optimal performance, the 0.001
mF
capacitors must be selected for 1% or better matching and all
resistors should have 1% or better tolerance.
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