General Description

The ICS1522 is a very high performance monolithic phase locked 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.

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.

Features

• 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

• LCD Projector Systems

• Multimedia video line locking

• Genlock applications