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BA7657F Datasheet(PDF) 13 Page - Rohm

Part No. BA7657F
Description  Broadband Triple Circuits Video Signal Switchers
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Maker  ROHM [Rohm]
Homepage  http://www.rohm.com
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BA7657F Datasheet(HTML) 13 Page - Rohm

 
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●Description of operations
BH7659FS
1) Analog SW block
R, G, and B chroma signals are switched in two channels.
INA is selected by applying a high-level voltage to the CTL pin, and INB is selected by applying a low-level voltage.
When the power save pin (pin 8) is set to high level, the current to the SW block's output transistors is reduced to lower
the circuit current.
Even during low power mode, signal switching can be performed normally as long as there is no drop in frequency
characteristics.
2) CMOS analog SW block
SDA and SDC signals are switched via an I
2C bus to handle two channels of HD and VD synchronization signals, and to
exchange information bidirectionally between a computer and a monitor.
The switching circuits used by this IC handle are configured as CMOS analog switches in order to handle I
2C BUS
signals and to transmit input and output signals bidirectionally. (ON resistance: Ron 200 Ω typ.)
●Application circuit
BH7659FS
SCL IO
VCC
+
C2
C1
Ro
Ro
Ro
R3
R3
R3
R3
R3
R3
R3
R3
R3
SDA IO
VCC
R OUT
G OUT
B OUT
HD OUT
+
C2
C1
VCC
+
C2
C1
R
G
A
A
B
B
A
B
B
A
B
A
AA
B
B
B
C2
R1
R4
5. 1
Input A
R
G
B
VD
SDA
SCA
HD
Input B
R
G
B
VD
SDA
SCA
HD
R2
C1
VCC
C2
R1
R2
C1
VCC
C2
R1
R2
C1
VCC
C2
C3
R1
R2
R4
PS:H
C1
VCC
C2
C2
R1
R2
C1
VCC
C2
R1
R2
R4
R3
R3
R3
VD OUT
C3
CTL
IN A: H
IN B: L
N. C.
N. C.
C1
C1
VCC
VCC
R4
5. 1
R4
5. 1
R4
5. 1
R4
5. 1
R4
5. 1
R4
5. 1
R4
5. 1
POWER
SAVE
CTL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
+
Fig.9


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