SAA7111A Datasheet, PDF (21/72 Pages) NXP Semiconductors – Enhanced Video Input Processor EVIP

Philips Semiconductors
Enhanced Video Input Processor (EVIP)
10 GAIN CHARTS
handbook, halfpage
( ^7.5
512
dB ^{factor dB = 20 x log 10 gain =} 768 − i
5.5
MGC648
3.5
bit [8] = 1 i > 256
1.5
bit [8] = 0 i < 256
−0.5
−2.5
( ^{factor dB = 20 x log 10 gain =}
257 + i
512
−4.5
0
256
512
gain value (i)
Fig.12 Amplifier curve.
Product specification
SAA7111A
handbook, full pagewidth
ANALOG INPUT
ADC
NO BLANKING ACTIVE
1
0
VBLK
<- CLAMP
1
0
HCL
GAIN ->
1
0
HSY
1
0
CLL
0
1
SBOT
1
0
WIPE
+ CLAMP
− CLAMP NO CLAMP + GAIN
− GAIN fast − GAIN
slow + GAIN
MGC647
WIPE = white peak level (254); SBOT = sync bottom level (1); CLL = clamp level [60 Y (128 C)];
HSY = horizontal sync pulse; HCL = horizontal clamp pulse.
Fig.13 Clamp and gain flow.
1998 May 15
21