Samsung DVD-807K, Service Manual

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Circuit Descriptions
7-14
Samsung Electronics
7-4-3 Waveform description
It is used for internal digital signal process as 33MHz clock input waveform of DIC1 (TC90A19F) and carries out
swing in 1.4V level on the basis of DC level 1.65V.
• CH1 : DPCK1(DIC1-3, 33MHz input clock)
Fig. 7-19
It is used for PLL and CLV control as 27MHz servo clock input and output waveform of DIC1. The input swings
in approx. 2V of amplitude and the output swings in 3.3V.
• CH1 : SVCKI (DIC1-5)
• CH2 : SVCKO (DIC1-6)
Fig. 7-20
CH1 is RF signal waveform inputted to DIC1 and inputted with 2.5V of amplitude on the basis of approx. 1.65V
level. If RF signal is higher than slice level, CH2 of slice level is cut logic “1”(HIGH) and if lower, logic “0”(LOW)
thus converted into digital data. CH3 indicates a waveform that RF signal is cut by slice level and converted into
digital data.
• CH1 : RFIN(DIC1-50, RF Input signal)
• CH2 : SLCO (DIC1-42, Slice level)
• CH3 : ED7 (DIC1-34, Sliced data of RF signal)
Fig. 7-21
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