SAA7111A Datasheet, PDF (22/72 Pages) NXP Semiconductors – Enhanced Video Input Processor EVIP

Philips Semiconductors
Enhanced Video Input Processor (EVIP)
Product specification
SAA7111A
handbook, full pagewidth
NO ACTION
ANALOG INPUT
AMPLIFIER
gain
DAC
9
ANTI-ALIAS FILTER
ADC
8
1 _VBLK 0
1 _HOLDG 0
LUMA/CHROMA DECODER
STOP
1
X
0
1 _HSY 0
0 _>254 1
0 _<4
1
1 _<1
0
1 _>254 0
1 _>248 0
X=0
X=1
+1/F
+1/L −1/LLC2
+1/LLC2 −1/LLC2
+/− 0
GAIN ACCUMULATOR (18 BITS)
ACTUAL GAIN VALUE 9-BIT (AGV) [−6/+6 dB]
1
X
0
1
0
HSY
1
0
Y
AGV
UPDATE
FGV
GAIN VALUE 9-BIT
MGC652
X = system variable; Y = IAGV − FGVI > GUDL; VBLK = vertical blanking pulse;
HSY = horizontal sync pulse; AGV = actual gain value; FGV = frozen gain value.
Fig.14 Gain flow chart.
1998 May 15
22