Datenblatt-Suchmaschine für elektronische Bauteile |
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SM9501AV Datenblatt(PDF) 9 Page - Nippon Precision Circuits Inc |
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SM9501AV Datenblatt(HTML) 9 Page - Nippon Precision Circuits Inc |
9 / 10 page SM9501A/B NIPPON PRECISION CIRCUITS INC.—9 Crystal Filter Circuit External crystals are used as filters. Multiple frequencies (40kHz and 60kHz) are supported by connecting crystals in parallel. The center frequency and bandwidth of the filters is determined by the crystal characteris- tics. If the center frequency is lower than the target frequency, C ×40 and C×60 can be added to change the res- onant frequency. And R ×40 and R×60 can be added to adjust the filter Q factor. Internally, pin XO is linked to pin XI by a phase-inverted signal passed through a capacitor, which cancels the high-frequency components that pass through the crystal parallel capacitances. Detector Circuit The amplified signal is full-wave rectified and passed through a lowpass filter detector. The detector output is input to peak hold (pin CP) and bottom hold (pin CB) circuits to form the decoder reference potentials and peak hold potential for AGC control. Decoder Circuit The detector output and peak/bottom hold mid-level potential reference are used to decode the time code sig- nal, which is output on pin OUT. The output is active-LOW, so that the output is LOW when the input ampli- tude is HIGH. Standby Function When PON is open (or HIGH), the device is in standby mode and the current consumption is reduced. Receiver operation starts when PON goes LOW. PON Mode OUT Open (or HIGH) Standby HIGH LOW Operating Time code XO Rx40 Rx60 Cx40 Cx60 40kHz 60kHz XI Amplifier Rectifier LPF Peak/ Bottom Hold Bottom hold Peak hold VSS potential VSS potential VSS potential Bottom hold Peak hold Mid-level potential Decoder OUT output VSS potential LPF waveform VDD potential VSS potential VSS potential Rectifier LPF Peak/ Bottom Hold |
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Ähnliche Beschreibung - SM9501AV |
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