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TDA9144 数据表(PDF) 7 Page - NXP Semiconductors |
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TDA9144 数据表(HTML) 7 Page - NXP Semiconductors |
7 / 44 page 1996 Jan 17 7 Philips Semiconductors Preliminary specification I2C-bus controlled, alignment-free PAL/NTSC/SECAM decoder/sync processor with PALplus helper demodulator TDA9144 Fig.3 Search loop of the identification circuit. handbook, full pagewidth PAL KILLED PAL KILLED PAL KILLED NTSC KILLED NTSC KILLED SECAM KILLED Reference crystal Second crystal MGE040 PAL NTSC NTSC PAL SECAM c c c c c c c c c c c Integrated filters All chrominance bandpass and notch filters, including the luminance delay line, are an integral part of the IC. The filters are gyrator-capacitor type filters. The resonant frequency of the filters is controlled by a circuit that uses the active crystal to tune the SECAM Cloche filter during the vertical flyback time. The remaining filters and the luminance delay line are matched to this filter. The filters can be switched to either 4.43 MHz, 4.29 MHz or 3.58 MHz. The switching is controlled by the standard identification circuit. The luminance notch used for SECAM has a lower Q-factor than the notch used for PAL/NTSC. The notches are provided with a little preshoot to obtain a symmetrical step response. In Y/C mode the chrominance notch filters are bypassed, to preserve full signal bandwidth. For a CVBS signal the chrominance notch filters can be bypassed by bus selection of bit TB (trap bypass). The luminance to helper delay difference can be adjusted by I2C-bus, to achieve a correct fitting for the delay in the PALplus helper demodulation signal path and the luminance path (not for helper only with trap). The delay of the colour difference signals −(R−Y) and −(B−Y) in the chrominance signal path and the external chrominance delay lines when used, can be fitted to the luminance signal delay control via I2C-bus in 40 ns steps. The typical luminance delay can be calculated: delay ≈ 90 + SAK⋅SBK {170 + 40(FRQ⋅TB)} + 160(YD3) + 160(YD2) + 80(YD1) + 40(YD0) [ns]. |
类似零件编号 - TDA9144 |
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类似说明 - TDA9144 |
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