TECHNICAL NOTE
High-performance Video Signal Switchers
Broadband Triple Circuits
Video Signal Switchers
BA7657S/F, BH7659FS
●Description
The BA7657S, BA7657F, and BH7659FS are ICs that have been developed for use in PC monitors, HDTVs (high definition
televisions), and other high-resolution display devices. In addition to their wide-range switching circuits for RGB signals,
H
D signals
, and V
D signals
, the BA7657S and BA7657F feature a separation (BUNRI) circuit for the synchronization signal that
2
is superposed on the G signal, while the BH7659FS features an on-chip switch for I C bus signals (SDA and SCL).
These ICs can be used to simplify the input block configuration in advanced display devices.
●Features
1) Operates on 5 V single power supply.
2) Built-in wide-range RGB signal switches.
(BA7657S/F: fc = 230 MHz)
(BH7659FS: fc = 250 MHz)
3) Built-in switching circuit for H
D
signal and V
D
signal.
4) Built-in separation (BUNRI) circuit for synchronization signal superposed on G signal.
2
5) Built-in switch for I C bus signals (SDA and SCL). (BH7659FS)
6) Built-in power saving function. (BH7659FS)
(BA7657S/F)
●Use
PC monitors, Plasma displays, LCD monitors, and Other devices that use wide-range RGB signal switching.
●Lineup
Parameter
Circuit current (mA)
Circuit current during low-power mode (mA)
RGB signal SW block frequency
characteristics (MHz)
Synchronization signal SW block circuit
configuration
Synchronization signal separation circuit
Package
BA7657S/F
35
―
230
2 digital switching circuits
SDIP24/SOP24
BH7659FS
25
14
250
4 CMOS analog switching circuits
―
SSOP-A32
●Absolute
Maximum Ratings（Ta=25℃）
Parameter
Symbol
Limits
Unit
Supply voltage
8.0
V
V
CC
BA7657S
1200
Power
BA7657F
550
Pd
mW
dissipation
BH7659FS
800
Operating temperature
Topr
-25½+75
℃
Storage temperature
Tstg
-55½+125
℃
※Deratings
is done at 12mW/℃ (BA7657S), 5.5mW/℃ (BA7657F), 8mW/℃ (BA7659FS) above Ta=25℃.
●Operating
Range（Ta=25℃）
Parameter
Symbol
Supply voltage
V
CC
Min.
Typ.
Max.
Unit
4.5
5.0
5.5
V
※This
product is not designed for protection against radioactive rays.
Aug.2008
●Electrical
characteristics (1/2)
BA7657S/F
（Unless
otherwise noted, Ta=25℃, Vcc=5.0V）
Parameter
Circuit current
〈Analog
SW block〉
Maximum output level
Voltage gain
Input pin voltage gain differential
Inter block voltage gain differential
Input pin cross talk1
Interblock crosstalk1
〈Digital
SW block〉
“H”
“L”
“H”
“L”
level input voltage
level input voltage
level input current
level input current
V
IH
V
IL
I
IH
I
IL
T
R
T
F
T
RD
T
FD
V
OH
V
OL
I
OH
I
OL
1.8
―
80
-3
―
―
―
―
3.0
―
-400
5
―
―
100
-1
30
30
50
30
3.7
0.2
―
―
―
1.2
130
―
50
50
80
50
―
0.4
―
―
V
V
μA
μA
ns
ns
ns
ns
V
V
μA
mA
V
IN
=5.0V
V
IN
=0V
Vom
G
V
△G
Vl
G
VB
CTI1
CTB1
2.8
-1.0
-0.2
-0.2
―
―
―
-0.5
0
0
-50
-50
―
0
0.2
0.2
-40
-40
V
P-P
dB
dB
dB
dB
dB
f=1kHz
f=1MHz,V
IN
=1V
P-P
f=1MHz,V
IN
=1V
P-P
f=1MHz,V
IN
=1V
P-P
f=10MHz,V
IN
=1V
P-P
f=10MHz,V
IN
=1V
P-P
Symbol
ICC
Min.
20
Typ.
35
Max.
50
Unit
mA
Conditions
Rise time
Fall time
Rise delay time
Fall delay time
“H”
“L”
“H”
“L”
level output voltage
level output voltage
level output current
level output current
〈Synchronization
signal separation block〉
Minimum SYNC separation level
“H”
“L”
“L”
level output voltage
level output voltage
level output current
V
SMin.
V
OH
V
OL
I
OL
T
R
T
F
T
RD
T
FD
-50
4.5
―
2
―
―
―
―
―
5.0
0.2
―
80
30
100
100
50
―
0.5
―
130
80
150
150
mV
P-P
V
V
mA
ns
ns
ns
ns
Rise time
Fall time
Rise delay time
Fall delay time
〈Control
block〉
“H”
“L”
“H”
“L”
level input voltage
level input voltage
level input current
level input current
V
IH
V
IL
I
IH
I
IL
1.8
―
80
-3
―
―
100
-1
―
1.2
130
―
V
V
μA
μA
2/16
●Electrical
characteristics (2/2)
BA7657S/F
Guaranteed design parameters
Parameter
〈Analog
SW block〉
Input pin cross talk 2
Interblock cross talk 2
Frequency characteristic
Input pin frequency differential
Interblock frequency
characteristic differential
〈SYNC
separation block〉
SYNC separation frequency
SYNC separation pulse width 1
SYNC separation pulse width 2
SYNC separation pulse width 3
SYNC separation level 1
SYNC separation level 2
SYNC separation level 3
fH-R
pwH1
pwH2
pwH3
VS1
VS2
VS3
200
3.0
0.5
0.3
300
100
60
―
―
―
―
―
―
―
―
―
―
―
―
―
―
kHz
μS
μS
μS
μS
μS
μS
Input waveform
※1
Input waveform
※2
fH=20kHz
Input waveform
※2
fH=100kHz
Input waveform
※2
fH=200kHz
Input waveform
※3
fH=20kHz
Input waveform
※3
fH=100kHz
Input waveform
※3
fH=200kHz
CTI2
CTB2
Gf
△Gfl
△GfB
―
―
-6
-1
-1
-30
-30
-3
0
0
-15
-15
-1
+1
+1
dB
dB
dB
dB
dB
f=230kHz, V
IN
=1V
P-P
f=230MHz,V
IN
=1V
P-P
f=1MHz/230MHz, V
IN
=1V
P-P
f=1MHz/100MHz, V
IN
=1V
P-P
f=1MHz/100MHz, V
IN
=1V
P-P
Symbol
Min.
Typ.
（Unless
otherwise noted, Ta=25℃, Vcc=5.0V）
Max.
Unit
Conditions
〈Input
waveform〉
※1
V
S
and pwH are variable. V
S
and pwH are inter-related. See the characteristics diagram.
※2
V
S
= 130 mW and pwH are variable.
※3
pwH = 1 µs and V
S
are variable.
Period of horizontal synchronization signal
DUTY 25%
(1H)
Vr=0.7V
Vs=130mV
pwH=1μs
3/16
●Pin
descriptions (1/2)
BA7657S/F
Pin No.
1
3
5
7
9
11
Pin name
Red1 Input
Vc c
Reference
potential
Equivalent circuit
Function
Green1 Input
Blue1 Input
Red2 Input
Green2 Input
Blue2 Input
V cc
3.7V
when selected
0V
when not
selected
1 00
6.8k
21k
2-channel switching of R,
G, and B signals.
Select between:
CTL: H input1
CTL: L input2
1k
15
19
21
Blue output
Green output
Red output
2.0V
50
400
5
mA
Output pins for RGB signals.
Insert resistance from 100 to
300
Ω
near the pins to
suppress f peaks at high
frequencies.
Vc c
35k
H≧1.8V
16
Control
1k
L≦1.2V
50k
15k
CTL pins
Select between:
CTL: H input1
CTL: L input2
12
13
23
24
V
D
1 input
V
D
2 input
H
D
2 input
H
D
1 input
H≧1.8V
L≦1.2V
2-channel switching of VD
and HD signals.
Select between:
CTL: H input1
CTL: L input2
14
22
V
D
output
H
D
output
V
OH
≧3.0V
V
OL
≦10.5V
Output pins for vertical
synchronization signal (V
D
)
And horizontal
synchronization signal (H
D
).
5/16
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