PRELIMINARY INFORMATION
ICS548-05A
MP3 Audio Clock
Description
The ICS548-05 is a low cost, low jitter, high
performance clock synthesizer designed to
produce audio sampling rates for MP3 systems.
Using ICS’ patented analog/digital Phase-Locked
Loop (PLL) techniques, the device uses an
inexpensive 3.6864 MHz crystal or clock input to
exactly produce all of the popular audio sampling
frequencies. Power down modes allow the chip to
be turned off completely, or the PLL and audio
clock output to be turned off separately.
ICS manufactures the largest variety of
multimedia clock synthesizers for all applications.
Consult ICS to eliminate VCXOs, crystals and
oscillators from your board.
Features
• Packaged in 16 pin TSSOP
• Ideal for Cirrus Logic’s MP3 chips
• Replaces multiple oscillators
• 3.3V (will work down to 2.7V) or 5V operation
• Uses an inexpensive 3.6864 MHz crystal or
clock input
• Supports 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz
audio sampling rates
• Provides 128fs and 256fs clocks
• Zero ppm synthesis error
• Includes Power Down features
• Advanced, low power, sub-micron CMOS process
Block Diagram
S3:S0
REFEN
PDCLK
X1
4
PLL/Clock
Synthesis
Circuitry
Output
Buffer
CLK
3.6864 MHz
crystal or clock
Crystal
Oscillator
X2
Output
Buffer
REFOUT
Optional crystal capacitors
MDS 548-05 AC
1
Revision 032900
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
