参数资料
型号: TVP5158IPNP
厂商: TEXAS INSTRUMENTS INC
元件分类: 颜色信号转换
英文描述: COLOR SIGNAL DECODER, PQFP128
封装: GREEN, PLASTIC, HTQFP-128
文件页数: 45/108页
文件大小: 1395K
代理商: TVP5158IPNP
VSSA
27-MHz
Crystal
27-MHz CLK
Output to other TVP5158
XTAL_IN pin
27-MHz CLK
Output to other TVP5158
XTAL_IN pin
0 W
SLES243E
– JULY 2009 – REVISED MARCH 2011
3.11 Clock Circuits
An analog clock multiplier PLL is used to generate a system clock from an external 27-MHz crystal
(fundamental resonant frequency) or external clock reference input. A crystal can be connected across
terminals 99 (XTAL_IN) and 101 (XTAL_OUT), or a 1.8-V external clock input can be connected to
terminal 99. Four horizontal PLLs generate the line-locked sample clock for each video decoder core from
the system clock. Four color PLLs generate the color subcarrier frequency for each video decoder core
from the corresponding line-locked clock. Four vertical PLLs generate the field/frame sync for each video
decoder core. A frequency synthesizer generates the 32.768-MHz audio oversampling clock for each
analog audio input from the system clock.
Figure 3-21 shows the reference clock configurations. For the example crystal circuit shown, the external
capacitors must have the following relationship:
CL1 = CL2 = 2CL – CSTRAY
Where CSTRAY is the terminal capacitance with respect to ground, and CL is the crystal load capacitance
specified by the crystal manufacturer.
Figure 3-21. Clock and Crystal Connectivity
Copyright
2009–2011, Texas Instruments Incorporated
Functional Description
41
Product Folder Link(s): TVP5158 TVP5157 TVP5156
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