I
2
C BUS CONTROLLED R/G/B VIDEO AMPLIFIER FOR MONITORS
KA2500
I
2
C BUS CONTROLLED R/G/B VIDEO AMPLIFIER
28-DIP-600A
The KA2500 is a very high frequency video amplifier
system with I
2
C Bus control used in Monitors with high
resolution up to1280
×
1024.
It contains 3 matched R/G/B video Amplifiers with OSD
interface and provides flexible interfacing to I
2
C Bus
controlled adjustment systems.
FUNCTIONS
• R/G/B Video Amplifier
• OSD Interface
• I
2
C BUS Control
• Contrast/OSD Contrast
• Brightness Control
• Cut-Off Brightness Control
• R/G/B SUB Contrast/Cut-Off Control
• Blank/Clamp Gate
• Half tone
• Brightness Uniformity
Device
KA2500
Package
28-DIP-600A
Operating Temperature
-20
°C
~ +75
°C
ORDERING INFORMATION
FEATURES
• 3 - Channel R/G/B Video Amplifier, 150MHz @f-3dB
• I
2
C Bus Control Items
- Contrast Control
- SUB Contrast Control For Each Channel
- Brightness Control
- OSD Contrast Control
- Cut-off Brightness Control
- Cut-off Control For Each Channel
- Switch Registers for SBLK and Video Half Tone and
Cut-Off INT/EXT
• SUB Contrast Control Range: -11dB
• Capable of 7.0Vpp Output Swing Range
• Video/OSD High Speed Switch
• Clamp Gate With Anti OSD Sagging
• B/U (Brightness Uniformity) Interface
• Video Input Clamp, BRT Clamp
• Video & OSD Half Tone Function on OSD
Picture
(OSD Raster Selection by HS1, 2: 4 colors)
• OSD Interface, OSD BLK
• ABL
• TTL R/G/B OSD Inputs, 80MHz bandwidth
• Contrast Control Range: -38dB
• OSD Contrast Control Range: -38dB
1
KA2500
I
2
C BUS CONTROLLED R/G/B VIDEO AMPLIFIER FOR MONITORS
BLOCK DIAGRAM
ONE (RED)
OF THREE CHANNELS
ROSD
GOSD
1
OSD
INTERFACE
OSD
RASTER
VIDEO
HALF-TONE
OSD
CONTRAST
BLK
VIDEO
OSD
SWITCH
A2
26 ROUT
CLP
+
VIDEO
CONTRAST
SUB
CONTRAST
A1
2
27
A3
gm2
RCLP
RCT
BOSD
VCC2
3
9
gm1
HALF-TONE
17
23
+
+
Cut Off
VCC3
+
22
21
GND3
BOUT
RIN
VCC1
5
6
CLP
R/G/B CUT OFF CONTROL (07/08/09H)
R/G/B DRIVE CONTROL (02/03/04H)
CLP
BLK
GND1
7
CONTRAST CONTRAL (00H)
OSD CONT CONTROL (05H)
20
BCLP
BCT
CUT OFF EXT OFFSET D3:5 (0AH)
CUT OFF INT/EXT SWITCH(0AH)
BRIGHTNESS CONTROL (01H)
GIN
8
B/U
INTERFACE
VIDEO/OSD
SWITCH
CLAMP
GATE
VIDEO
HALF-TONE
OSD RASTER
SELECT
VIDEO-HALF TONE SWITCH
D1(0AH)
15
CUT OFF BRIGHT (06H)
B/U
VI/OSD_SW
28
4
24 GOUT
25
16
GCLP
GCT
OSD RASTER COLOR
D6:7(0AH)
SOFT BLANK
D0(0AH)
CLP
18
BLANK
GATE
BIN
BLK
10
12
ABL
19
I
2
C BUS CONTROL
INTERFACE & CONTROL
14
SDA
GND(L)
11
13
SCL
2