ROHM BA7657S, BA7657F Datasheet
1
Multimedia ICs
Input selector switch for high
definition displays
BA7657F / BA7657S
The BA7657F and BA7657S are for high definition displays, and have internal switches for switching between broadband RGB signals and HD / VD signals, as well as an internal synchronization separator. These ICs simplify the designing of input units for deluxe displays.
•
Applications
CRT display, HDTV, video board for personal computer, etc.
•
Features
1) Operates on a single 5V power supply.
2) Internal broadband RGB switch (frequency characteristics: 230MHz, – 3dB).
3) Internal HD / VD switch.
4) Internal synchronization separator for synchronizing
signals superimposed onto G signals.
•
Absolute maximum ratings (Ta = 25°C)
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits Unit
Power supply voltage V
CC 8.0 V
Power
dissipation
BA7657F 550
∗
mW
BA7657S 1200
∗
Operating temperature Topr °C
Storage temperature Tstg °C
Pd
– 25 ~ + 75
– 55 ~ + 125
∗
Reduced by 5.5mW (BA7657F) or 12mW (BA7657S) for each increase in Ta of 1°C over 25°C.
Parameter Symbol Min. Typ. Max. Unit
Power supply voltage V
VCC 4.5 5.0 5.5
2
Multimedia ICs BA7657F / BA7657S
•
Block diagram
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
1
2
1
2
1
2
1
2
1
2
DET
Logic
Syncsepa
Ground
Ground
Ground
Ground
V
CC
CTL (H: IN1, L: IN2)
Red 1 input
Green 1 input
Blue 1 input
Red 2 input
Green 2 input
Blue 2 input
VD 1 input VD 2 input
VD output
Blue output
Composite sync output
Composite video input (Sync on Green)
Green output
Red output
HD output
HD 2 input
HD 1 input
HD Sync signal detector
3
Multimedia ICs BA7657F / BA7657S
•
Pin descriptions
Pin name
1 Red 1 input Color signal R1 input
2
detector
HD Sync signal Detecting phase of the synchronization
signal detector circuit
3 Green 1 input Color signal G1 input
4 Ground Ground
5 Blue 1 input Color signal B1 input
6 Ground Ground
7 Red 2 input Color signal R2 input
8 Ground Ground
9 Green 2 input Color signal G2 input
10 Ground Ground
11 Blue 2 input Color signal B2 input
VD 1 input Vertical synchronization signal VD1 input
14 VD output Vertical synchronization signal VD output
15 Blue output Color signal B output
16 Control Control (high = IN1, low = IN2)
17
output
Composite sync
Synchronization signal output
18
input
Composite video
Composite signal input
(Sync on Green)
19 Green output Color signal G output
20 V
CC
Power supply
21 Red output Color signal R output
22 HD output Horizontal synch. signal HD output
23 HD 2 input Horizontal synch. signal HD2 input
24 HD 1 input Horizontal synch. signal HD1 input
Pin name
13 VD 2 input Vertical synchronization signal VD2 input
Function Pin No. FunctionPin No.
12
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Output selection setting table
CTL R G B HD VD
H IN1 IN1 IN1 IN1 IN1
L IN2 IN2 IN2 IN2 IN2
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Input / output circuits
1, 3, 5
7, 9, 11pin
6.8k
21k
1k
100
VCC
R. G. B input
15, 19, 21pin
400
50
5mA
VCC
R. G. B output
12, 13
23, 24pin
15k
35k
1k
50k
V
CC
HD. VD input
4
Multimedia ICs BA7657F / BA7657S
14, 22pin
100
1.2k
2.0k
V
CC
15k
660
HD. VD output
16pin
1k
50k
35k
15k
VCC
Control
2pin
25k
25k
V
CC
from HD out to sync sepa
HD sync signal detector
18pin
25k
25k 50µA
VCC
100
from DET out
Composite Video input
17pin
VCC
Composite Sync output
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