Integrated
Circuit
Systems, Inc.
ICS9120-08
ICS9120-09
Frequency Generator for Multimedia Audio Synthesis
General Description
The
ICS9120-08
and ICS
9120-09
are high performance
frequency generators designed to support stereo audio codec
systems. It offers both clock frequencies required by stereo
codecs such as the CS4231 and the AD1848 plus the clock
needed for the OPL4 FM synthesizer. These frequencies can
be synthesized from the existing 14.318 MHz system clock or
from the on-chip oscillator using a 14.318 MHz crystal (-08
only).
High accuracy, low jitter PLLs meet the 0.125% frequency
tolerance and -96dB signal-to-noise ratios required by 16 bit
audio systems. Fast output clock edge rates minimize board
induced jitter.
Unlike competitive devices, the
ICS9120-08
and
ICS9120-09
operate over the entire 3.0-5.5V range, with the
-09 providing power-down to minimize energy consumption.
Features
•
•
•
•
•
•
•
•
•
Generates 16.934 MHz and 24.576 MHz stereo codec
clocks plus the 33.868 MHz OPL4 clock
Single 14.318MHz crystal or system clock reference
Buffered REFCLK output
0.125% frequency accuracy meets OPL4 specifications
100 ps one sigma jitter maintains 16 bit performance
Output rise/fall times less than 2.0 nS
On chip loop filter components
3.3V - 5 V supply range
8 pin, 150mil SOIC package
Applications
•
Specifically designed to support the high performance
requirements of multimedia audio systems.
Block Diagram
X1
14.318
MHz
X2(-08)
External
Crystal
Load Caps
XTAL
OSC
REF (14.3MHz)
PD(-09)
CLK1 (24.6MHz)
PLL
CLOCK
GEN
÷2
CLK2 (33.9MHz)
CLK3 (16.9MHz)
9120-08 9120-09 Rev C 052297P
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any information being relied upon by the customer is current
and accurate.
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
