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MC13077DW Datasheet(PDF) 8 Page - Motorola, Inc |
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MC13077DW Datasheet(HTML) 8 Page - Motorola, Inc |
8 / 14 page MC13077 8 MOTOROLA ANALOG IC DEVICE DATA Figure 5. Relationship Showing the Counts of a 3.58 MHz Clock versus a 4.43 MHz Clock at the End of a Horizontal Period fsc fsc/256 256 512 NTSC: (3.58 MHz) (63.56 µs) = 227.5 counts PAL: (4.43 MHz) (64 µs) = 283.75 counts Chroma Band Limiting and Luma Delay Once the color difference and burst flag envelopes have been modulated, the two components are internally summed and applied to an output buffer that will drive the external bandpass circuitry before entering the chip again at Pin 20. The sum of the color difference modulators produces an output that is high in harmonic content. For this reason, and to reduce the possibility of cross color, a chroma bandpass transformer is used to band–limit the chroma. Suggested bandpass filters and specifications for NTSC and PAL are shown in Figure 6a and 6b. For each of these filters, approximately 300 ns of group delay is experienced by the filtered chroma. There is also an internal delay on the order of 100 ns due to internal filtering that must be considered. Thus a 400 ns luma delay line is used to equalize the timing of the luma and the chroma. Suitable 400 ns delay lines are the T O KO H321LNP–1436PBAB and the TDK DL122401D–1533. The delay of the luma channel is inserted between Pins 10 and 6. Pin 10 is the buffered output of the luma from the RGB matrix. This output is capable of driving the external passive delay line with no external gain or buffering required. 0 TOKO H286BAlS–6276DAD NTSC Bandpass Filter 0.2 0.4 1.0 2.0 3.0 4.0 5.0 6.0 7.0 40 30 20 10 50 FREQUENCY (MHz) Figure 6a. Group Delay and Magnitude Response of the TOKO Bandpass Filter Intended for NTSC Applications Attenuation Group Delay 1.0 k 1.0 k 17 4.7 nF 20 60 0 8.0 9.0 0 0.2 0.4 1.0 2.0 3.0 4.0 5.0 6.0 7.0 40 30 20 10 50 FREQUENCY (MHz) 8.0 Figure 6b. Group Delay and Magnitude Response of the TOKO Bandpass Filter Intended for PAL Applications Attenuation Group Delay 60 0 9.0 1.0 k 1.0 k 17 TOKO H286BAIS–4963DAD PAL Bandpass Filter 3 4 4.7 nF 20 1 6 3 4 1 6 Characteristics of TOKO Bandpass Filter (H286BAIS – 6276DAD) Frequency (MHz) Attenuation (dB) Group Delay ( µs) 2.0 8.0 (min) 0.12 2.8 3.0 ± 3.0 0.25 3.58 Ins. Loss 3.5 (max) 0.290 ± 0.030 4.3 3.0 ± 3.0 0.24 6.2 15 (min) 0.05 Characteristics of TOKO Bandpass Filter (H286BAIS – 4963DAD) Frequency (MHz) Attenuation (dB) Group Delay ( µs) 2.50 10 (min) 0.075 3.73 3.0 ± 3.0 0.24 4.43 Ins Loss 2.0 (max) 0.295 ± 0.035 5.13 3.0 ± 3.0 0.24 6.50 12 (min) 0.05 |
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