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
-25�½�+75
℃
Storage temperature
Tstg
-55�½�+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
ROHM [ ROHM ]
