SAA7152 Datasheet, PDF(8/15 Page) NXP Semiconductors

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SAA7152 Datasheet, PDF (8/15 Pages) NXP Semiconductors – Digital Video Comb Filter DCF

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Philips Semiconductors

Digital Video Comb Filter (DCF)

Product speciï¬cation

SAA7152

Table 1 I2C-bus; subaddress and data bytes for writing (after X = 0 in address byte)

FUNCTION

SUBADDRESS

Controls

BYPS

CSEL

DATA

CCMB YCMB TAPS

CFRQ NLIN

LLEN

Function of the bits of Table 1:

BYPS

CSEL

CCMB

YCMB

TAPS

CFRQ

NLIN

LLEN

Select bypass with a short delay; all other 0 = no bypass

functions are disabled:

1 = comb ï¬lter bypassed (delay is 3 LLC)

Input mode select:

0 = CVBS selected

1 = Y/C selected

Select comb ï¬ltering

0 = chrominance is bandpassed

1 = chrominance is comb-ï¬ltered

Enable chrominance substruction from

CVBS signal:

0 = disabled, CVBS/Y signal is only low-passed

1 = enabled (chrominance trap or comb ï¬ltering)

Selects tap for switching Y and C to

adder:

0 = for bandpass/low-pass combination

1 = for comb ï¬lter active

Select centre frequency and matching

factor of chrominance ï¬lter:

0 = 4.43 MHz

1 = 3.58 MHz

Select delay (number of lines):

0 = 4-line comb ï¬lter for standard PAL

1 = 2-line ï¬lter for standard NTSC

Selects the number of clocks for each

line delay:

0 = 1728 clocks (625 lines; 50 Hz)

1 = 1716 clocks (525 lines; 60 Hz)

August 1996

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