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PDF BA7658AFS Data sheet ( Hoja de datos )
| Número de pieza | BA7658AFS | |
| Descripción | Input selector switch for high definition displays | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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 super-
imposed on the G signal.
5) Internal detector for NUTEK power saving signals.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
Power dissipation
VCC
Pd
7.0
850∗
Operating temperature
Topr
– 25 ~ + 75
Storage temperature
Tstg – 55 ~ + 125
∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
Unit
V
mW
°C
°C
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ.
Power supply voltage
VCC 4.5 5.0
Max.
5.5
Unit
V
1
1 page  
Multimedia ICs
Signal detector output
VCC
10k
23pin
Signal detector input
28pin
7k
100
6k
BA7658AFS
VCC
6k
F.F.
6k
HD. VD input
14, 15
31, 32pin
1k
50k
HD. VD input
VCC
VCC 2.7k 100
35k
16, 30pin
15k
HD sync signal detector
from HD out to sync sepa
VCC
25k
670
20pin
25k
5
5 Page 
Multimedia ICs
•Circuit operation
(1) Analog switches
Switch between the two sets of R, G and B color sig-
nals. IN1 is selected by impressing the high level volt-
age on the CTL pin, IN2 by impressing the low level
voltage.
(2) Digital switches
These switch between the two sets of HD and VD syn-
chronization signals. HD and VD synchronization sig-
nals for IN1 are output by impressing the high level
voltage on the CTL pin, HD and VD synchronization
signals for IN2 by impressing the low level voltage.
(3) Synchronization separation block
Outputs the synchronization signals by separating
them from composite signals (Sync on Green). When
HD signals are being input, the synchronization signal
detector stops the synchronization separator. The low
BA7658AFS
level voltage is output. The time that the synchroniza-
tion separator is stopped can be set by changing the
time constant attached to the synchronization signal
detection pin.
(4) Signal detection block
When the signal input exceeds the level set inside the
IC (typically 400mVP-P, VCC = 5.0V), the high level volt-
age is output to the color signal detection output pin.
The low level voltage is output when the signal input is
lower than the set level. The quiescent circuit reaction
time can be set by changing the time constant attached
to pin used to set the time constant for color signal
detection. The signal detector stops while the high level
is being input to the blanking pulse input pin, thereby
preventing malfunctioning due setup signal block dur-
ing the synchronization signal period.
The relationship between inputs and outputs
Input
Output
HD VD Sync on Green HD VD Composite Sync
—— ᭺ —— ᭺
᭺— ᭺ ᭺— —
—᭺ ᭺ —᭺ ᭺
᭺᭺ ᭺ ᭺᭺ —
᭺— — ᭺— —
—᭺ — —᭺ —
᭺᭺ — ᭺᭺ —
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BA7658AFS.PDF ] | |
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