海量电子元器件搜索引擎
Cyrix
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描述:Following the filter section is a decoder employing digital counting techniques to determine the frequencies of the incoming tones and to verify that they correspond to standard DTMF frequencies. A complex averaging algorithm protects against tone simulation by extraneous signals such as voice while providing tolerance to small frequency deviations and variations. This averaging algorithm has been developed to ensure an optimum combination of immunity to talk-off and tolerance to the presence of interfering frequencies (third tones) and noise. When the detector recognizes the presence of two valid tones (this is referred to as the signal condition in some industry specifications) the Early Steering (ESt) output will go to an active state. Any subsequent loss of signal condition will cause ESt to assume an inactive state (see Steering Circuit).
描述:The process starts at the first low-level bit received from the demodulator. After that the CLOCK is generated for the 10 serial bits (1 bit start, 8 bits data, 1 bit stop).When all the data are received DATA READY is generated. This signal loads the serial data in a parallel buffer.
描述:3-5days
描述:3-5days
描述:PLCC
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描述:Notes: 3. VIL(min.) = −2.0V for pulse durations less than 20 ns., VIH(max.) = Vcc+0.75V for pulse durations less than 20 ns. 4. Full device operation requires linear ramp of Vcc from 0V to Vcc(min) and Vcc must be stable at Vcc(min) for 500 µ s. 5. Typical values are included for reference only and are not guaranteed or tested. Typical values are measured at VCC = VCC(typ), TA = 25C. 6. Tested initially and after any design or proces changes that may affect these parameters.
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描述:+5V reference output. This low-drift zener voltage reference is necessary for setting the bipolar offset point of the input stage. This pin must be strapped to either Offset or Offset Adjust to allow the isolation amplifier to function. The reference is often useful for input signal conditioning circuits. See Effect of Reference Loading on Offset performance curve for the effect of offset voltage change with reference loading. Reference1 is identical to, but independent of, Reference2 . This output is short circuit protected.
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