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| Key Features - - - - Resolutions Up To QXGA 60Hz 250ps Long Term Jitter 64 Phase Choices Zero Offset Error/Offset Drift X98027 275MHz Triple Video Digitizer with Digital PLL PRELIMINARY INFORMATION DESCRIPTION The X98027 3-channel, 8-bit Analog Front End (AFE) contains all the components necessary to digitize analog RGB or YUV graphics signals from personal computers, workstations and video set-top boxes. The fully differential analog design provides high PSRR and dynamic performance to meet the strigent requirements of the graphics display industry. The 275MSPS conversion rate supports resolutions up to QXGA at 60Hz refresh rate, while the front end's high input bandwidth ensures sharp images at the highest resolution. To minimize noise, the X98027's analog section features 2 sets of pseudo-differential RGB inputs with programmable input bandwidth, as well as internal DC restore clamping (including mid-scale clamping for YUV signals). This is followed by the programmable gain/offset stage and the three 275MSPS Analog-to-Digital Converters (ADCs). All necessary reference voltages are internally generated. The X98027's digital PLL generates a pixel clock from the analog source's HSYNC or SOG (Sync-On-Green) signals. Pixel clock output frequencies range from 10MHz to 275MHz with long-term clock jitter less than 250ps peak to peak. FEATURES * * * * * * * * * * * 275MSPS maximum conversion rate 64 interpixel sampling positions Low long-term PLL clock jitter (250ps p-p @ 275MSPS) Programmable input bandwidth (100MHz to 780MHz) 2 channel input multiplexer RGB and YUV 4:2:2 output formats 4 embedded voltage regulators allow operation from single 3.3V supply and enhance performance, isolation Completely independent 8 bit gain/10 bit offset control CSYNC and SOG support Trilevel Sync detection 1180mW typical PD @ 275MSPS APPLICATIONS * * * * * LCD Monitors and Projectors Digital TVs Plasma Display Panels RGB Graphics Processing Scan Converters BLOCK DIAGRAM VCLAMP Offset DAC 10 Auto Black Level Compensation 8 RP[7:0] RS[7:0] RIN1 VIN+ VIN- RIN2 PGA VCLAMP + 8 bit ADC Auto Black Level Compensation 8 8 Offset DAC 10 Output Data Formatter GIN1 RGBGND1 GIN2 RGBGND2 VIN+ VIN- 8 8 PGA VCLAMP + 8 bit ADC Auto Black Level Compensation 8 GP[7:0] GS[7:0] Offset DAC 10 BIN1 VIN+ VIN- 8 8 BIN2 PGA + 8 bit ADC 8 BP[7:0] BS[7:0] DATACLK SOGIN1 SOGIN2 HSYNCIN1 HSYNCIN2 VSYNCIN1 VSYNCIN2 HSYNCOUT CLOCKINV XTALIN XTALOUT SCL SDA SADDR VSYNCOUT DATACLK Sync Processing AFE Configuration and Control HSOUT VSOUT Digital PLL Serial Interface www.xicor.com XTALCLKOUT REV 0.7 9/21/03 Characteristics subject to change without notice |
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