π type filter circuit composed of ISO122/124

Published:2011/11/9 21:53:00 Author:May | Keyword: filter | From:SeekIC

The diagram is π type filter circuit composed of ISO122/124. ISO122/124 internal osicillator set the modem frequency at 500KHz. In order to suppressthe noise from DC/DC convertor, ituses π type filter composed of inductors and capacitors wave filtering at every power source end. After wave filtering, ISO122/124 output end's 500KHz ripples are suppressed to 20mV, then it uses low-cost OPA602 ( or OPA237) to make up two pole low-pass filter forfurther wave filtering, and the two pole low-pass filter cutoff point is 100KHz.



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