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Partname:HT9020B
Description:Call Progress Tone Detector
Manufacturer:Holtek Semiconductor Inc.
Datasheet:PDF (120K).
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The HT9020B call progress tone detector is a telecom peripheral for Auto-dialing system use. Switched capacitors technology is implemented into the chip to get good performance characteristics of band pass filter in the range of 305 to 640Hz call progress tone which is dual tone multi-frequency signal.

Click here to download HT9020B Datasheet
Click here to download HT9020B Datasheet
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