SAA7118 Datasheet, PDF (22/169 Pages) NXP Semiconductors – Multistandard video decoder with adaptive comb filter and component video input

Philips Semiconductors
Multistandard video decoder with adaptive
comb filter and component video input
Preliminary specification
SAA7118
handbook, full pagewidth
ANALOG INPUT
gain
9
AMPLIFIER
DAC
ANTI-ALIAS FILTER
ADC
9
LUMA/CHROMA DECODER
NO ACTION
1 _VBLK 0
1 _HOLDG 0
1
X
0
1
0
HSY
0 _>510 1
0
<4
1
1 _<1
0
1 _>510 0
1 _>496 0
X=0
X=1
+1/ F
+1/L −1/LLC2
+1/LLC2 −1/LLC2
+/− 0
STOP
GAIN ACCUMULATOR (18 BITS)
ACTUAL GAIN VALUE 9-BIT (AGV) [−3/+6 dB]
1
X
0
1
0
HSY
1
0
Y
X = system variable.
Y = AGV – FGV > GUDL .
GUDL = gain update level (adjustable).
VBLK = vertical blanking pulse.
HSY = horizontal sync pulse.
AGV = actual gain value.
FGV = frozen gain value.
AGV
UPDATE
GAIN VALUE 9-BIT
FGV
MHB728
Fig.9 Gain flow chart.
2001 May 30
22