saa7191b NXP Semiconductors, saa7191b Datasheet - Page 28

• Manufacturer Part Number: saa7191b
• Description: Digital Multistandard Colour Decoder, Square Pixel Dmsd-sqp
• Manufacturer: NXP Semiconductors

Philips Semiconductors
August 1996
APER1
“06”
HUE7
“07”
CKTQ4
“08”
CKTS4
“09”
PLSE7
“0A”
SESE7
“0B”
COLO
“0C”
LFIS1
“0C”
VTRC
“0D”
NFEN
HRMV
GPSWO
SECS
Digital Multistandard Colour Decoder,
Square Pixel (DMSD-SQP)
to
to
to
to
to
to
to
APER0
HUE0
CKTQ0
CKTS0
PLSE0
SESE0
LFIS0
Aperture bandpass filter weights high frequency components of luminance signal:
APER1
0
0
1
1
Hue control from 178.6 to 180.0 , equals data bytes 7F to 80 (hex); 0 equals 00.
Colour-killer threshold QAM from approximately 30 dB to 18 dB, equals data bytes
F8 to 07 (hex)
Colour-killer threshold SECAM from approximately 30 dB to 18 dB, equals data bytes.
F8 to 07 (hex)
PAL switch sensitivity from LOW-to-HIGH (HIGH means immediate sequence correction),
equals FF to 00 (hex), MEDIUM equals 80.
SECAM switch sensitivity from LOW-to-HIGH (HIGH means immediate sequence
correction), equals FF to 00 (hex), MEDIUM equals 80.
Colour on bit: 0 = automatic colour-killer enabled; 1 = forced colour on.
Chrominance gain control (AGC filter):
LFIS1
VTR/TV mode bit : 0 = TV mode (slow time constant); 1 = VTR mode (fast time constant)
SAA7191B-specified functions enable (RTCO, ODD and GPSW0 outputs)
HREF generation: 0 = like SAA7191;
General purpose switch 0:
SECAM mode bit : 0 = other standards; 1 = SECAM
0 = outputs set to high-impedance (circuit equals SAA7191); 1 = outputs active
0
0
1
1
APER0
0
1
0
1
LFIS0
0
1
0
1
=
=
=
=
28
factor
loop filter time constant
slow
medium
fast
actual gain, stored for test purposes only
0 = output pin 65 LOW; 1 = output pin 65 HIGH
0
0.25
0.5
1
)
)
)
)
1 = HREF is 8 x LLC2 clocks earlier
Figure 16 to 25
Product specification
SAA7191B