Integrated
Circuit
Systems, Inc.
ICS1522
User-ProgrammableVideo Clock Generator/ Line-Locked
Clock Regenerator
General Description
Features
The ICS1522 is a very high performance monolithic phaselocked loop (PLL) frequency synthesizer. Utilizing ICS’s
advanced CMOS mixed-mode technology, the ICS1522
provides a low-cost solution for high-end video clock
generation where synchronization to an external video
source is required.
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The ICS1522 has differential video clock outputs (CLK+
and CLK-) that are compatible with industry standard
video DAC.
Operating frequencies are fully programmable with direct
control provided for reference divider, feedback divider
and postscaler.
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Serial programming: Feedback and reference divisors,
VCO gain, phase comparator gain, relative phase and
test modes.
Supports high-resolution graphics - Differential CLK
out-puts to 230 MHz
Eliminates need for multiple ECL output voltage controlled crystal oscillators and external components
Fully-programmable synthesizer capability - not just a
clock multiplier
Line-locked clock generation capability;
15 - 100 kHz
External feedback loop capability allows graphics
system to be used as the feedback divisor with
synchronous switchover to internal feedback
Small footprint 24-pin SOIC
Coarse and fine phase adjustment permits precise
clocking in video recovery application
Applications
Block Diagram
1522 RevG 021005
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LCD Projector Systems
Multimedia video line locking
Genlock applications
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.
