ML6431CH MICRO-LINEAR [Micro Linear Corporation], ML6431CH Datasheet - Page 10

• Manufacturer Part Number: ML6431CH
• Description: Genlocking Sync Generator with Digital Audio Clock for NTSC, PAL & VGA
• Manufacturer: MICRO-LINEAR [Micro Linear Corporation]

ML6430/ML6431
FUNCTIONAL DESCRIPTION
VIDEO STANDARD
3.58MHz Crystal
NTSC Square Pixel
NTSC 601
NTSC 4fsc
PAL Square Pixel
PAL 601
PAL 4fsc
4.43MHz Crystal
NTSC Square Pixel
NTSC 601
NTSC 4fsc
PAL Square Pixel
PAL 601
PAL 4fsc
DISABLING AUTOMATIC VCR SIGNAL DETECTION
DEVICE
ML6430
ML6431
In the ML6430, the VCR detection circuit is always
enabled. This circuit detects the presence of a VCR input
signal at C
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.
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.
10
In the ML6431, the VCR detection circuit operates the
CENTER FREQUENCY AND ± RANGE FOR EACH FREQUENCY
VIN
/ H
DISABLE VCR SIGNAL DETECTION?
No. Detection function is always on.
Yes. Detection function can be disabled
or enabled via serial bus only. This
feature is enabled by default.
STANDARD OF THE ML6430
SYNC
CLOCK RATE
4xClk= 49.09MHz
4xClk= 49.09MHz
4xClk= 54.00MHz
4xClk= 57.27MHz
4xClk= 59.00MHz
4xClk= 54.00MHz
4xClk= 35.47MHz
4xClk= 54.00MHz
4xClk= 57.27MHz
4xClk= 59.00MHz
4xClk= 54.00MHz
4xClk= 35.47MHz
(pin 6) and automatically adjusts
Table 5.
Table 4. NTSC/ PAL Clock Rate Range vs. Crystal Input
+8.35%/ –5.19%
+8.28%/ –5.23%
CLOCK RATE
ACCURACY
+6.07%/ –7.18%
+7.15%/ –6.23%
+4.01%/ –9.10%
+6.07%/–7.18%
+9.58%/ –4.14%
+7.81%/ –5.64%
+6.00%/ –7.18%
+7.27%/ –6.13%
+7.81%/–5.64%
+7.05%/ –6.31%
(Continued)
VIDEO STANDARD
3.58MHz Crystal
NTSC Square Pixel
NTSC 601
NTSC 4fsc
PAL Square Pixel
PAL 601
PAL 4fsc
4.43MHz Crystal
NTSC Square Pixel
NTSC 601
NTSC 4fsc
PAL Square Pixel
PAL 601
PAL 4fsc
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 F
In NTSC mode, F
low transition of the FIELD ID pin (pin 17) and the
beginning of line 1 (see Figure 2).
In the PAL mode, F
high transition of the FIELD ID pin and the end of line
310 (see Figure 3).
CENTER FREQUENCY AND ± RANGE FOR EACH FREQUENCY
RESET
FOR NTSC vs. PAL MODES
RESET
STANDARD OF THE ML6431
RESET
CLOCK RATE
4xClk= 49.09MHz
4xClk= 49.09MHz
4xClk= 54.00MHz
4xClk= 57.27MHz
4xClk= 59.00MHz
4xClk= 54.00MHz
4xClk= 35.47MHz
4xClk= 54.00MHz
4xClk= 57.27MHz
4xClk= 59.00MHz
4xClk= 54.00MHz
4xClk= 35.47MHz
(pin 22) goes low on the high-to-
(pin 22)goes low on the low-to-
+8.35%/ –5.19%
+8.28%/ –5.23%
CLOCK RATE
ACCURACY
+6.07%/ –7.18%
+7.15%/ –6.23%
+7.47%/ –5.93%
+6.07%/–7.18%
+7.64%/ –5.77%
+7.81%/ –5.64%
+6.00%/ –7.18%
+7.27%/ –6.13%
+7.81%/–5.64%
+7.05%/ –6.31%