AD711KR-REEL Analog Devices Inc, AD711KR-REEL Datasheet - Page 12

• Manufacturer Part Number: AD711KR-REEL
• Description: IC OPAMP BIFET PREC 25MA 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD711KR-REEL

• Rohs Status: RoHS non-compliant
• Amplifier Type: J-FET
• Number Of Circuits: 1
• Slew Rate: 20 V/µs
• -3db Bandwidth: 4MHz
• Current - Input Bias: 15pA
• Voltage - Input Offset: 200µV
• Current - Supply: 2.5mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 9 V ~ 36 V, ±4.5 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Type: -
• Gain Bandwidth Product: -

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
AD711
–15
farad-seconds. Each FDNR active network provides a
Figure 18. FDNR for 9-Pole Chebychev Filter
R: 24.9k
29.4k
V
IN
FOR 4.9395E
FOR 5.9276E
AD712
1/2
* SEE TEXT
AD711
+15V
–15V
0.001 F
A1
0.1 F
–15
–15
0.1 F
1k
4.99k
R
0.001 F
0.001 F
100k
10
–15
AD712
4.9395E
and 5.9276
+15V
–15V
1/2
2800
0.1 F
0.1 F
*
–15
A
Figure 17. 9-Pole Chebychev Filter
5.9276E
6190
–15
B
*
5.9276E
6490
–12–
–15
C
*
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.
4.9395E
6190
Figure 19. High Frequency Response for 9-Pole
Chebychev Filter
–15
D
*
2800
0.001
F
124k
AD711
+15V
–15V
A2
0.1 F
0.1 F
4.99k
4.99k
V
OUT
REV. E