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AD712KN Datasheet(PDF) 14 Page - Analog Devices |
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AD712KN Datasheet(HTML) 14 Page - Analog Devices |
14 / 15 page AD712 REV. B –14– +15V 0.001 F 100k 0.1 F 0.1 F A2 AD711 –15V +15V 0.1 F 0.1 F A1 AD711 –15V * D * C * B * A 2800 6190 6490 6190 2800 VIN 0.001 F 124k 4.99k 4.99k VOUT 4.9395E–15 5.9276E–15 5.9276E–15 4.9395E–15 *SEE TEXT Figure 40. 9-Pole Chebychev Filter 9-POLE CHEBYCHEV FILTER Figure 40 shows the AD712 and its dual counterpart, the AD711, 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 antialiasing filter for a 12-bit Data Acquisition System with 100 kHz throughput. As shown in Figure 40, 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 8 poles. The 9th pole consists of a 0.001 µF capacitor and a 124 kΩ resistor at Pin 3 of ampli- fier A2. Figure 41 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 0.001 F 4.99k 0.1 F 0.1 F 1/2 AD712 –15V 1.0k R: 24.9k FOR 4.9395E–15 29.4k FOR 5.9276E–15 1/2 AD712 0.001 F R Figure 41. FDNR for 9-Pole Chebychev Filter REF 5.0 dBm 10 dB/DIV RANGE –5.0 dBm MARKER 96 800.0 Hz –90 dBm START.0 Hz RBW 300 Hz STOP 200 000.0 Hz ST 69.6 SEC VBW 30 Hz Figure 42. High Frequency Response for 9-Pole Chebychev Filter |
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