MK2745-21SLF Datasheet, PDF (1/6 Pages) Integrated Device Technology – DVD/MPEG CLOCK SOURCE

DVD/MPEG CLOCK SOURCE
DATASHEET
MK2745-21
Description
Features
The MK2745-21 is a low-cost, low-jitter, high-performance
clock synthesizer for DVD and other MPEG 2-based
applications. Using analog Phase-Locked Loop (PLL)
techniques, the device accepts a 27 MHz fundamental
mode crystal or clock input to produce multiple audio output
clocks, a processor clock, the processor clock divided by
two, 27 MHz, 24.576 MHz, and a selectable audio clock.
The audio clocks are frequency-locked to the 27 MHz using
our patented zero ppm error techniques. This allows audio
and video to track exactly, thereby eliminating the need for
large buffer memory.
IDT manufactures a large variety of DVD, Set-top Box, and
multimedia clock synthesizers for all applications. Consult
IDT to eliminate crystals and oscillators from your board.
Block Diagram
• Packaged in a 16-pin narrow (150 mil) SOIC
• Ideal for LuxSonor’s DVD solutions
• 3.3 V upgrade to the MK2744
• Patented zero ppm audio clock error for 256x and 384x
sampling rates
• Selectable audio sampling frequencies support 32, 44.1,
and 48 kHz in most DACs
• 27 MHz fundamental crystal or clock input
• Eight selectable processor frequencies
• Fixed clocks of 27 and 24.576 MHz
• Zero ppm in all clocks
• 25 mA output drive capability at TTL levels
• Advanced, low-power, sub-micron CMOS process
• Operating voltage of 3.0 V to 5.5 V
• See also the MK2712 for NTSC/PAL clocks
VDD
2
AS2:0
PS1:0
27 MHz crystal
or clock
X1
X2
3
Clock
Synthesis and
Control
2
Circuitry
/2
Clock Buffer/
Crystal
Ocsillator
2
GND
Audio Clock
24.576 MHz
Processor Clock
PCLK/2
27 MHz
IDT™ DVD/MPEG CLOCK SOURCE
1
MK2745-21 REV F 051310