ML6430 datasheet(10/33 Pages) MICRO-LINEAR

10 / 33 page

ML6430/ML6431

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

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

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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