ICS1523

Integrated Circuit Systems, Inc. ICS1523 High-Performance Programmable Line-Locked Clock Generator General Description The ICS1523 is a low-cost but very high-performance frequency generator for line-locked and genlocked highresolution video applications. Using ICS’s advanced low-voltage CMOS mixed-mode technology, the ICS1523 is an effective clock solution for video projectors and displays at resolutions from VGA to beyond UXGA. The ICS1523 offers pixel clock outputs in both differential (to 250 MHz) and single-ended (to 150 MHz) formats. Dynamic Phase Adjust™ circuitry allows user control of the pixel clock phase relative to the recovered sync signal. A second differential output at half the pixel clock rate enables deMUXing of multiplexed analog-to-digital converters. The FUNC pin provides either the regenerated input from the phase-locked loop (PLL) divider chain output or a re-synchronized and sharpened input HSYNC. The advanced PLL uses either its internal programmable feedback divider or an external divider. The device is programmed by a standard I2C-bus™ serial interface and is available in a 24-pin wide small-outline integrated circuit (SOIC) package. Features • • • • • • • • • • • • Pixel clock frequencies up to 250 MHz Very low jitter Dynamic Phase Adjust (DPA) for clock outputs Balanced PECL differential outputs Single-ended SSTL_3 clock outputs Double-buffered PLL/DPA control registers Independent software reset for PLL/DPA External or internal loop filter sel...