|
|
PDF BA7078AF Data sheet ( Hoja de datos )
| Número de pieza | BA7078AF | |
| Descripción | Synchronization signal processor for high definition displays | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de BA7078AF (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
Multimedia ICs
BA7078AF/AS
Synchronization signal processor for
high definition displays
BA7078AF/AS
The BA7078AF is a synchronization signal processing LSI chip designed for multiscan high-definition displays. It
generates a synchronization signal and clamp pulse for three types of input signals: separate synchronization, composite
synchronization, and synchronization on video.
!Application
CRT displays
!Features
1) Operates on a single 5V power supply, with low power consumption.
2) Synchronization signal existence and polarity detec-tion output.
3) Adjustable clamp pulse width, allowing for the selec-tion of front or back editing.
4) Vertical synchronization separation is based on hori-zontal frequency tracking, for separation starting at 1H.
5) Minimal attached components.
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
Power dissipation
VCC 7.0
∗1 450(BA7078AF)
Pd ∗2 600(BA7078AS)
Operating temperature
Topr
−25 to +75
Storage temperature
Tstg
−55 to +125
∗1 Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.
∗2 Reduced by 6.0mW 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. Max.
Power supply voltage VCC 4.5 5.0 5.5
Unit
V
1/12
1 page  
Multimedia ICs
VDRV
VCC
11pin
GND
9pin
BA7078AF/AS
CLAMP
VCC
12pin
HDRV
13pin
POLV
VCC
VCC
VCC
10kΩ
VCC
16pin
14 pin
EXIH
17pin
VCC
10kΩ
EXIV
15pin
VCC
10kΩ
POLH
18pin
VCC
10kΩ
5/12
5 Page 
Multimedia ICs
BA7078AF/AS
!Attached components
R : The resistor for limiting the LED current.
Use the resistor of not less than 1W.
C1 : 47µF
Coupling capacitor for C / H SYNC IN
A low capacitance increases the size of the input pin waveform’s sag.
R
RPM-850
LED
C2 : 1µF
Coupling capacitor for VIDEO IN
A low capacitance increase the size of the input pin waveform’s sag.
C3 : 0.56µF
Conversion capacitor for f-V
A low capacitance increase the size of the ripple of the f-V conversion voltage. A large capacitance is not a
problem, but will delay the reaction speed.
C4 : 1.5 µF
Capacitor for POLH (detection of the vertical synchronization signal’s polarity)
The minimum capacitance is determined as follows:
The internal hysteresis comparator does not react when the duty of minimum frequency synchronization
(fV = 40Hz, T = 25ms) is 50%.
CMin. = 16µ × T [F]
A large capacitance is not a probrem, built will deray the reaction speed.
C5 : 1µF
Capacitor for EXIH (detection of the vertical synchronization signal’s existance)
The minimum capacitance is determined as follows:
The internal hysteresis comparator does not react at the minimum frequency synchronization (fV = 40Hz,
T = 25ms)
CMin. = 16µ × T [F]
A large capacitance is not a problem, but will deray the reaction speed.
C6 : 100pF Constant for setting the clamp pulse width
C7 : 0.47µF Coupling capacitor for VSYNC IN
A low capacitance increases the size of the input pin waveform’s sag.
R1 : 3.9kΩ A low resistance results in a narrow clamp pulse width. Set no lower than 1kΩ.
R2 : 1MΩ Discharge current setting resistor for CLAMP IN
11/12
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BA7078AF.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BA7078AF | Synchronization signal processor for high definition displays | ROHM Semiconductor |
| BA7078AS | Synchronization signal processor for high definition displays | ROHM Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |