1
Multimedia ICs
Clock generator
BU2185F
This IC generates the different clock used for DVD. Generates clocks for CD use, sound use, and MPEG use.
•
Applications
DVD players
•
Features
1) By connecting a crystal oscillating element, the dif-
ferent clock signals are generated.
2) Enables selection of the reference clock directly or
with 1 / 2 output.
3) SOP 16-pin package.
4) Single 3.3V power supply.
5) With the standard clock output, an independent 5V
power supply can be applied for a 5V output.
•
Block diagram
DATA1A
XTAL1
OSC
XTAL2
OSC
PLL1
PLL2
DATA1B
DATA2A
DATA2B
XTAL1 IN
XTAL1 OUT
CTRL1
CTRL2
XTAL2 IN
XTAL 2OUT
OE
H
SW
L
1 / 2
CLK2
(27.0000MHz )
CLK1
(36.8640MHz)
(18.4320MHz)
CLK3
(33.8688MHz)
CTRL1 CTRL2
L
L
H
H
H
L
H
L
H
L
H
L
DATA1A
DATA1A
DATA1B
DATA1B
DATA2A
DATA2A
DATA2B
DATA2B
SW PLL1 PLL2
DATA1A = XTAL2
*
375 / 128 / 4
DATA1B = XTAL2
*
375 / 64 / 4
DATA2A = XTAL2
*
147 / 40 / 4
DATA2B = XTAL2
*
147 / 20 / 4