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HT9170 pdf datasheet (DTMF Rec

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  • 上传时间:2021-11-18
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  • 标      签: Re HT DTMF

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The HT9170 series are Dual Tone MulTI Frequency(DTMF) receivers integrated with digitaldecoder and bandsplit filter funcTIons. TheHT9170B and HT9170D types supply powerdownmode and inhibit mode operaTIons. Alltypes of the HT9170 series use digital counTIngtechniques to detect and decode all the 16DTMF tone pairs into a 4-bit code output.Highly accurate switched capacitor filters areemployed to divide tone (DTMF) signals intolow and high group signals. A built-in dial tonerejection circuit is provided to eliminate theneed for pre-filtering.
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