ROHM BA7658AFS Datasheet
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 superimposed on the G signal.
5) Internal detector for NUTEK power saving signals.
•
Absolute maximum ratings (Ta = 25°C)
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 = 25°C)
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage V
CC 4.5 5.0 5.5 V
2
Multimedia ICs BA7658AFS
•
Block diagram
1
2
3
4
5
6
7
8
9
10
11
12
1
2
1
2
1
2
1
2
1
2
32
31
30
29
28
27
26
25
24
13
14
15
16 17
18
19
20
21
22
23
Sync
Sepa
Logic
DET
Signal
DET
N.C.
Control
Ground
Ground
Ground
Ground
Ground
N.C.
Ground
Blue 1 input
Green 1 input
Red 1 input
Blue 2 input
Green 2 input
Red 2 input
VD 1 input
VD 2 input
VD output
Red output
Composite sync output
HD Sync signal detector
Setting of time constant
Composite video input
Green output
(sync on green)
Blanking pulse input
Signal detector output
V
CC
Signal detector input
Blue output
HD output
HD 2 input
HD 1 input
3
Multimedia ICs BA7658AFS
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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
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Output selection setting table
CTL B G R HD VD
H IN1IN1 IN1 IN1 IN1 IN1
L IN2 IN2 IN2 IN2 IN2
4
Multimedia ICs BA7658AFS
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Input / output circuits
1, 3, 5
7, 9, 11pin
6.8k
21k
1k
100
VCC
R. G. B. input
50
VCC
400
5mA
17, 26, 29pin
R. G. B. output
Control
1k
50k
35k
15k
V
CC
18pin
VCC
25k
25k
50µA
25pin
100
Composite video input
from DET out
VCC
19pin
Composite sync output
VCC
24pin
Setting of time constant
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