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 HDTV, video board for personal computer, etc.
CRT displays,
•
Features on a single 5V power supply.
1) Operates
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 = 25°C)
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
Pd
Topr
Tstg
Limits
7.0
850
∗
– 25 ~ + 75
– 55 ~ + 125
Unit
V
mW
°C
°C
∗
Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
•
Recommended operating conditions (Ta = 25°C)
Parameter
Power supply voltage
Symbol
V
CC
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
1
Multimedia ICs
BA7658AFS
•
Pin descriptions
Pin No. Pin name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Function
Pin No.
20
21
22
23
24
25
26
27
28
29
30
31
32
Pin name
Function
Blue 1 input B1 color signal input
Ground
GND
HD Sync signal
Synchronization signal detector
detector
N.C.
N.C.
Green 1 input G1 color signal input
Ground
GND
Blanking pulse
Blanking pulse input
input
Signal detector
Signal detector output
output
Setting of time
Setting of time constant
constant
Composite video
Composite video input
input
Green output G signal output
V
CC
V
CC
Red 1 input R1 color signal input
Ground
GND
Blue 2 input B2 color signal input
Ground
GND
Green 2 input G2 color signal input
Ground
GND
Red 2 input R2 color signal input
N.C.
Ground
N.C.
GND
Signal detector
Signal detector input
input
Blue output
HD output
HD 2 input
HD 1 input
B signal output
Horizontal synchronization signal HD output
Horizontal synchronization signal HD2 input
Horizontal synchronization signal HD1 input
VD 1 input Vertical synchronization signal VD1 input
VD 2 input Vertical synchronization signal VD2 input
VD output
Vertical synchronization signal VD output
Red output R color signal output
Control
CTL (H = IN1, L = IN2)
Composite sync
Synchronization signal output
output
•
Output selection setting table
CTL
H
L
B
IN1
IN2
G
IN1
IN2
R
IN1
IN2
HD
IN1
IN2
VD
IN1
IN2
3
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