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ML6430 Datasheet(PDF) 10 Page - Micro Linear Corporation |
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ML6430 Datasheet(HTML) 10 Page - Micro Linear Corporation |
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10 / 33 page  ML6430/ML6431 10 FUNCTIONAL DESCRIPTION (Continued) Table 4. NTSC/ PAL Clock Rate Range vs. Crystal Input DISABLING AUTOMATIC VCR SIGNAL DETECTION DEVICE DISABLE VCR SIGNAL DETECTION? ML6430 No. Detection function is always on. ML6431 Yes. Detection function can be disabled or enabled via serial bus only. This feature is enabled by default. Table 5. In the ML6430, the VCR detection circuit is always enabled. This circuit detects the presence of a VCR input signal at CVIN / HSYNC (pin 6) and automatically adjusts the gain settings for the digital PLL to optimize locking performance. This circuit scans for head switching greater than the thresholds selected by the user threshold bits (via serial bus) and then increases the phase gain of the digital PLL to compensate. In the ML6431, the VCR detection circuit operates the same as the ML6430 with the additional ability to disable or enable the VCR detection circuit to optimize for low jitter performance. This feature is enabled by default. This feature can be disabled in the ML6431 only by setting the appropriate values in Register 7, Bit 0 via the serial bus interface (see Table 11). When the VCR detect circuit is disabled, the ML6431 is optimized for low jitter performance. PULSE GENERATOR MODE 54MHz Input or Any 4X Clock The 54MHz pin (pin 3) is an input that clocks the horizontal and vertical counters. In this mode, the ML6430 or ML6431 is used as a pulse generator. The input signal at can be any 4X clock; for example, 54MHz (4 x CCIR clock rate of 13.5MHz), 49.09MHz (4 x Square Pixel clock rate of 12.27MHz), or 57.27 MHz (4 x Fsc clock rate of 14.31MHz for NTSC color subcarrier). This input is limited to 70MHz. As a pulse generator, the sync, clamp, blanking, and clock signals are derived from the clock input at the 54MHz pin. This mode is activated by setting the appropriate values in Register 7 via the serial bus. See Tables 10 or 11. USING FRESET FOR NTSC vs. PAL MODES In NTSC mode, FRESET (pin 22) goes low on the high-to- low transition of the FIELD ID pin (pin 17) and the beginning of line 1 (see Figure 2). In the PAL mode, FRESET (pin 22)goes low on the low-to- high transition of the FIELD ID pin and the end of line 310 (see Figure 3). CENTER FREQUENCY AND ± RANGE FOR EACH FREQUENCY STANDARD OF THE ML6431 VIDEO STANDARD CLOCK RATE CLOCK RATE ACCURACY 3.58MHz Crystal NTSC Square Pixel 4xClk= 49.09MHz +8.35%/ –5.19% NTSC 601 4xClk= 54.00MHz +6.07%/ –7.18% NTSC 4fsc 4xClk= 57.27MHz +7.15%/ –6.23% PAL Square Pixel 4xClk= 59.00MHz +7.47%/ –5.93% PAL 601 4xClk= 54.00MHz +6.07%/–7.18% PAL 4fsc 4xClk= 35.47MHz +7.64%/ –5.77% 4.43MHz Crystal NTSC Square Pixel 4xClk= 49.09MHz +8.28%/ –5.23% NTSC 601 4xClk= 54.00MHz +7.81%/ –5.64% NTSC 4fsc 4xClk= 57.27MHz +6.00%/ –7.18% PAL Square Pixel 4xClk= 59.00MHz +7.27%/ –6.13% PAL 601 4xClk= 54.00MHz +7.81%/–5.64% PAL 4fsc 4xClk= 35.47MHz +7.05%/ –6.31% CENTER FREQUENCY AND ± RANGE FOR EACH FREQUENCY STANDARD OF THE ML6430 VIDEO STANDARD CLOCK RATE CLOCK RATE ACCURACY 3.58MHz Crystal NTSC Square Pixel 4xClk= 49.09MHz +8.35%/ –5.19% NTSC 601 4xClk= 54.00MHz +6.07%/ –7.18% NTSC 4fsc 4xClk= 57.27MHz +7.15%/ –6.23% PAL Square Pixel 4xClk= 59.00MHz +4.01%/ –9.10% PAL 601 4xClk= 54.00MHz +6.07%/–7.18% PAL 4fsc 4xClk= 35.47MHz +9.58%/ –4.14% 4.43MHz Crystal NTSC Square Pixel 4xClk= 49.09MHz +8.28%/ –5.23% NTSC 601 4xClk= 54.00MHz +7.81%/ –5.64% NTSC 4fsc 4xClk= 57.27MHz +6.00%/ –7.18% PAL Square Pixel 4xClk= 59.00MHz +7.27%/ –6.13% PAL 601 4xClk= 54.00MHz +7.81%/–5.64% PAL 4fsc 4xClk= 35.47MHz +7.05%/ –6.31% |
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