LF48212

LF48212 DEVICES INCORPORATED 12 x 12-bit Alpha Mixer LF48212 DEVICES INCORPORATED 12 x 12-bit Alpha Mixer DESCRIPTION The LF48212 is a high-speed video alpha mixer capable of mixing video signals at real-time video rates. It takes two 12-bit video signals and mixes them together using an alpha mix factor. Alpha determines the weighting that each video signal receives during the mix operation. The input video data can be in either unsigned or two’s complement format, but both inputs must be in the same format. Independently controlled programmable delay stages are provided for the input and control signals to allow for allignment of input data if necessary. The delay stages can be programmed to have from 0 to 7 delays. The 13-bit output of the alpha mixer is registered with three-state drivers and may be rounded to 8, 10, 12, or 13-bits. FEATURES u 50 MHz Data and Computation Rate u Two’s Complement or Unsigned Operands u On-board Programmable Delay Stages u Programmable Output Rounding u Replaces Harris HSP48212 u Package Styles Available: 68-pin PLCC, J-Lead 64-pin PQFP LF48212 BLOCK DIAGRAM α11-0 12 DINA11-0 12 DINB11-0 12 BYPASS DEL LD DELAY CONTROL REGISTER 15 0-7 0-7 0-7 FORMAT FORMAT α CLK MIXEN OE 1.0 – α ADJUST TC 0-7 4 FORMAT RND1-0 0-7 2 4 13 NOTE: NUMBERS IN REGISTERS INDICATE NUMBER OF PIPELINE DELAYS. DOUT12-0 Video Imaging Products 1 08/16/2000–LDS.48212-F LF48212 DEVICES INCORPORATED 12 x 12-bit Alpha Mixer FIGURE 1. ALPHA MIX INPUT...