SAA7113H
Philips Semiconductors
9-bit video input processor
ANALOG INPUT
AMPLIFIER
9
gain
DAC
ANTI-ALIAS FILTER
ADC
9
LUMA/CHROMA DECODER
1
0
NO ACTION
VBLK
1
0
HOLDG
1
0
X
1
0
1
HSY
0
1
> 254
1
1
0
0
0
< 4
< 1
> 254
X = 1
X = 0
1
0
> 248
+/− 0
+1/L
+1/F
+1/LLC2 −1/LLC2
−1/LLC2
GAIN ACCUMULATOR (18 BITS)
STOP
ACTUAL GAIN VALUE 9-BIT (AGV) [−6/+6 dB]
1
0
X
1
0
HSY
1
0
Y
AGV
UPDATE
FGV
GAIN VALUE 9-BIT
mhb327
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.
Fig 7. Gain flow chart
9397 750 14232
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2005
10 of 75
NXP [ NXP ]
