AD712AQ Analog Devices Inc, AD712AQ Datasheet - Page 18

• Manufacturer Part Number: AD712AQ
• Description: IC OPAMP BIFET DUAL PREC 8CDIP
• Manufacturer: Analog Devices Inc

Specifications of AD712AQ

• Slew Rate: 20 V/µs
• Rohs Status: RoHS non-compliant
• Amplifier Type: J-FET
• Number Of Circuits: 2
• -3db Bandwidth: 4MHz
• Current - Input Bias: 25pA
• Voltage - Input Offset: 300µV
• Current - Supply: 5mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 9 V ~ 36 V, ±4.5 V ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-CDIP (0.300", 7.62mm)
• Op Amp Type: Precision
• No. Of Amplifiers: 2
• Bandwidth: 4MHz
• Supply Voltage Range: ± 4.5V To ± 18V
• Amplifier Case Style: DIP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Common Mode Rejection Ratio: 88
• Current, Input Bias: 25 pA
• Current, Input Offset: 10 pA
• Current, Offset, Input: 10 pA (Typ.)
• Current, Output: ±25 mA
• Current, Supply: 5 mA (Typ.)
• Harmonic Distortion: 0.0003 %
• Impedance, Thermal: 22 °C/W
• Number Of Amplifiers: Dual
• Package Type: CDIP-8
• Resistance, Input: 3×10^12 Ohms
• Temperature, Operating, Maximum: 85 °C
• Temperature, Operating, Minimum: -40 °C
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Input: ±20 V (Differential), -11.5 to +14.5 V (Common-Mode)
• Voltage, Noise: 45 nV/sqrt Hz
• Voltage, Offset: 0.3 mV
• Voltage, Offset, Input: 0.3 mV (Typ.)
• Voltage, Output, High: +13.9 V
• Voltage, Output, Low: -13.3 V
• Voltage, Supply: ±15 V
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD712
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
farad-seconds. Each FDNR active network provides a two-pole
response for 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.
R: 24.9kΩ FOR 4.9395E
29.4kΩ FOR 5.9276E
V
IN
AD712
Figure 51. FDNR for 9-Pole Chebychev Filter
1/2
–
+
+
AD711
–
–15
–15
A1
+15V
–15V
0.1µF
0.1µF
+
1.0kΩ
R
4.99kΩ
0.001µF
0.001µF
0.001µF
100kΩ
−15
4.9395E
+
–
AD712
and 5.9276 × 10
2800Ω
1/2
+15V
–15V
–15
A
*
0.1µF
0.1µF
+
5.9276E
*
6190Ω
SEE TEXT
Figure 50. 9-Pole Chebychev Filter
–15
B
*
–15
Rev. H | Page 18 of 20
+
5.9276E
6490Ω
–15
C
*
+
4.9395E
6190Ω
–15
Figure 52. High Frequency Response for 9-Pole Chebychev Filter
D
*
REF 5.0dBm
10dB/DIV
START.0Hz
RBW 300Hz
+
0.001µF
2800Ω
124kΩ
RANGE –5.0dBm
VBW 30Hz
+
–
AD711
A2
+15V
–15V
0.1µF
0.1µF
MARKER 96 800.0Hz
STOP 200 000.0Hz
ST 69.6 SEC
4.99kΩ
4.99kΩ
V
–90dBm
OUT