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SAA7151 Datasheet(PDF) 7 Page - NXP Semiconductors |
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SAA7151 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 49 page April 1993 7 Philips Semiconductors Product specification Digital multistandard colour decoder with SCART interface (DMSD2-SCART) SAA7151B handbook, full pagewidth TDA8446 VIDEO SWITCH AND MATRIX TDA8540 VIDEO SWITCH C Y Y/C CVBS R G B sync FS CVBS/Y/sync chroma BP C R G B sync LP LP + U V TDA8709A 8-bit ADC and multiplexer (CHROMINANCE) TDA8708A 8-bit ADC (LUMINANCE) CSO Y HCL GPSW1 GPSW2 FS * CPI SW1 SW2 FSO FSI from SCART interface SAA7151B GA GB ADI AO AO CPO CVBS(7-0) CUV(7-0) CPI CLS CLP MUXC GPSW1 +5 V CLK CLK MEH305-3 I C-bus (select) 2 FE ADI * fast switching of Y signal for insertion (UV are switched inside SAA7151B) clamping C V2 V0 sync LP CVBS/Y HCT4053 MULTIPLEXER U/V S0 S1 Fig.3 System configuration, RGB fast switch interface included (SCART). The multipliers operate as a quadrature demodulator for all PAL and NTSC signals; it operates as a frequency down-mixer for SECAM signals. The two multiplier output signals are converted to a serial UV data stream and applied to two low-pass filter stages, then to a gain controlled amplifier. A final multiplexed low-pass filter achieves, together with the preceding stages, the required bandwidth performance. The from PAL and NTSC originated signals are applied to a comb-filter. The signals, originated from SECAM, are fed through a cloche filter (0 Hz centre frequency), a phase demodulator and a differentiator to obtain frequency-demodulated colour-difference signals. The SECAM signals are fed after de-emphasis to a cross-over switch, to provide the both serial-transmitted colour-difference signals. These signals are finally fed via the fast switch to the output formatter stages and to the output interface. Chrominance signals are output in parallel (4:2:2) on the YUV-bus. The data rate of Y signal (pixel rate) is 13.5 MHz. UV signals have a data rate of 13.5 MHz/2 for the 4:2.2 format (Table 2) respectively 13.5 MHz/4 for the 4:1.1 format (Table 3). Component processing and SCART interface control The 8-bit multiplexed colour-difference input signal (signal CUV, Fig.1, out of matrixed RGB in Fig.3) is fed via the input interface to a chrominance stop filter (UV signal only can pass through; Figures 22 to 24). Here it is clamped and fed to the offset compensation which can be enabled or disabled via the I2C-bus. |
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