Electronic Components Datasheet Search |
|
OP282 Datasheet(PDF) 5 Page - Analog Devices |
|
OP282 Datasheet(HTML) 5 Page - Analog Devices |
5 / 12 page OP282/OP482 REV. B –5– The circuit shown in Figure 3 can be used to accurately program the “Q,” the cutoff frequency fC, and the gain of a two pole state-variable filter. OP482s have been used in this design because of their high bandwidths, low power and low noise. This circuit takes only three packages to build because of the quad configuration of the op amps and DACs. The DACs shown are all used in the voltage mode so all values are dependent only on the accuracy of the DAC and not on the absolute values of the DAC’s resistive ladders. This make this circuit unusually accurate for a programmable filter. Adjusting DAC 1 changes the signal amplitude across R1; therefore, the DAC attenuation times R1 determines the amount of signal current that charges the integrating capacitor, C1. This cutoff frequency can now be expressed as: fc = 1 2 πR 1C1 D 1 256 where D1 is the digital code for the DAC. Gain of this circuit is set by adjusting D3. The gain equation is: Gain = R 4 R 5 D 3 256 DAC 2 is used to set the “Q” of the circuit. Adjusting this DAC controls the amount of feedback from the bandpass node to the input summing node. Note that the digital value of the DAC is in the numerator, therefore zero code is not a valid operating point. Q = R 2 R 3 256 D 2 R5 2k 1/4 OP482 - + LOW PASS R6 2k R7 2k BANDPASS R1 2k 1/4 OP482 - + VIN 1/4 DAC8408 R4 2k 1/4 DAC8408 1/4 OP482 - + 1/4 OP482 - + HIGH PASS 1/4 DAC8408 - + 1/4 OP482 R1 2k 1/4 DAC8408 1/4 OP482 - + 1/4 OP482 - + R2 1k R3 2k 1/4 OP482 - + C1 1000pF C1 1000pF Figure 3. |
Similar Part No. - OP282 |
|
Similar Description - OP282 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |