1
Multimedia ICs
Input selector switch for high
definition displays
BA7658AFS
The BA7658AFS is an IC designed for high definition displays, and has an internal selector circuit for broadband
RGB signals and HD / VD signals, a synchronization separator circuit, and a NUTEK signal detector circuit. This IC
chip simplifies the configuration of input blocks for high-end displays.
Applications
CRT displays, HDTV, video board for personal computer, etc.
Features
1) Operates on a single 5V power supply.
2) Internal broadband RGB selector with a frequency
characteristic of 230MHz ( 3dB)
3) Internal HD / VD selector.
4) Internal separator for synchronization signal super-
imposed on the G signal.
5) Internal detector for NUTEK power saving signals.
Absolute maximum ratings (Ta = 25C)
Parameter
Symbol
Limits
Unit
Power supply voltage
V
CC
7.0
V
Power dissipation
mW
Operating temperature
Topr
C
Storage temperature
Tstg
C
Pd
850
25 ~ + 75
55 ~ + 125
Reduced by 8.5mW for each increase in Ta of 1
C over 25
C.
Recommended operating conditions (Ta = 25C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power supply voltage
V
CC
4.5
5.0
5.5
V
3
Multimedia ICs
BA7658AFS
Pin descriptions
Pin name
Pin name
B1 color signal input
20
Synchronization signal detector
GND
21
N.C.
G1 color signal input
22
Blanking pulse input
GND
R1 color signal input
23
Signal detector output
GND
24
Setting of time constant
B2 color signal input
GND
25
G2 color signal input
GND
26
G signal output
R2 color signal input
27
V
CC
N.C.
28
Signal detector input
GND
29
B signal output
Vertical synchronization signal VD1 input
30
Horizontal synchronization signal HD output
Vertical synchronization signal VD2 input
31
Horizontal synchronization signal HD2 input
Vertical synchronization signal VD output
32
Horizontal synchronization signal HD1 input
R color signal output
CTL (H = IN1, L = IN2)
Blue 1 input
Ground
Green 1 input
Ground
Red 1 input
Ground
Blue 2 input
Ground
Green 2 input
Ground
Red 2 input
N.C.
Ground
VD 1 input
VD 2 input
VD output
Red output
Control
Composite sync
output
Synchronization signal output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Pin No.
Function
Pin No.
Function
HD Sync signal
N.C.
input
Blanking pulse
output
Signal detector
constant
Setting of time
input
Composite video
Green output
V
CC
input
Signal detector
Blue output
HD output
HD 2 input
HD 1 input
Composite video input
detector
Output selection setting table
CTL
B
G
R
HD
VD
H
IN1
IN1
IN1
IN1
IN1
IN1
L
IN2
IN2
IN2
IN2
IN2
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