PRELIMINARY INFORMATION
I C R O
C
LOC K
Description
The MK2704 is a low cost, low jitter, high
performance PLL clock synthesizer designed to
replace oscillators and PLL circuits in set-top box
and multimedia systems. Using our patented
analog Phase-Locked Loop (PLL) techniques, the
device uses a fundamental 27 MHz crystal or clock
input to produce a buffered reference clock and a
selectable audio clock. The audio clock is
frequency locked to the 27 MHz clock, assuring
that the audio with zero ppm error and video will
always track perfectly.
MK2704
PLL Audio Clock Synthesizer
Features
• Packaged in 8 pin SOIC
• Uses an inexpensive fundamental crystal, or clock
• Output clocks of 16.9344 MHz, 18.432 MHz,
and 36.864 MHz
• Supports 384x MPEG sampling rates of 44.1 kHz,
48 kHz and 96 kHz
• Patented zero ppm synthesis error in all clocks
• All frequencies are frequency locked
• Advanced, low power, sub-micron CMOS process
• 3.3 V or 5 V operating voltage
Block Diagram
VDD
GND
S1:0
2
PLL
Clock
Synthesis
and
Control
Circuitry
Crystal
Oscillator
Output
Buffer
CLK
27 MHz
crystal or
clock
X1
Output
Buffer
27.000 MHz
X2
(Capacitors are required for crystal tuning)
MDS 2704 A
1
Revision 062700
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
