CXD1968AR
Crystal Oscillator
When used with an external clock signal, a level of 1Vp-p is recommended. This should be AC coupled,
1nF minimum. The oscillator cell will operate as a buffer but requires the 2.2MΩ feedback resistor, as
present for the crystal, to provide a DC path for the self-biasing action.
Transport Stream
The transport stream data rate is relatively low for smoothed parallel mode of operation, but is clocked at
40MHz in serial mode. In this mode the logic edges could create significant reflection in unterminated long
printed-board tracks. It is recommended that source resistors are used at the CXD1968AR prior to launching
along tracks of 50mm or more. A suitable source resistor value of 39 to 47Ω should be considered.
- 34 -
SONY [ SONY CORPORATION ]
