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HT9170 pdf datasheet (DTMF Rec
消耗积分:5 |
格式:rar |
大小:666 |
2008-10-14
张杰
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The HT9170 series are Dual Tone Multi Frequency
(DTMF) receivers integrated with digital
decoder and bandsplit filter functions. The
HT9170B and HT9170D types supply powerdown
mode and inhibit mode operations. All
types of the HT9170 series use digital counting
techniques to detect and decode all the 16
DTMF tone pairs into a 4-bit code output.
Highly accurate switched capacitor filters are
employed to divide tone (DTMF) signals into
low and high group signals. A built-in dial tone
rejection circuit is provided to eliminate the
need for pre-filtering.
(DTMF) receivers integrated with digital
decoder and bandsplit filter functions. The
HT9170B and HT9170D types supply powerdown
mode and inhibit mode operations. All
types of the HT9170 series use digital counting
techniques to detect and decode all the 16
DTMF tone pairs into a 4-bit code output.
Highly accurate switched capacitor filters are
employed to divide tone (DTMF) signals into
low and high group signals. A built-in dial tone
rejection circuit is provided to eliminate the
need for pre-filtering.
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