BA7078AF Rohm, BA7078AF Datasheet

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BA7078AF

Manufacturer Part Number
BA7078AF
Description
Synchronization signal processor for high definition displays
Manufacturer
Rohm
Datasheet

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Multimedia ICs
Synchronization signal processor for
high definition displays
BA7078AF
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)
! ! ! ! Recommended operating conditions (Ta = 25°C)
∗ Reduced by 4.5mW for each increase in
Power supply voltage
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Parameter
Parameter
Symbol
V
CC
Symbol
Topr
Tstg
V
Ta of 1°C over 25°C.
Pd
CC
Min.
4.5
Typ.
5.0
−55~+125
−25~+75
Limits
Max.
5.5
450
7.0
Unit
V
Unit
mW
°C
°C
V
BA7078AF

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BA7078AF Summary of contents

Page 1

... Multimedia ICs Synchronization signal processor for high definition displays BA7078AF 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 ...

Page 2

... Block diagram 1 HSCTL HSYNC IN 3 VIDEO IN VSEPA 4 5 VSYNC IN CVPOL 6 7 CVEXI 8 CPSEL CLAMP PULSE GEN. 9 GND H SYNC DET. SYNC SEPA. HOR. SYNC CONTROL V SYNC SEPA. V SYNC DET. BA7078AF 18 POLH 17 EXIH 16 POLV 15 EXIV 14 Vcc HDRV 13 12 CLAMP 11 VDRV 10 CPWID ...

Page 3

... For the output logic, refer to the separate table. Indicates whether the horizontal synchronization signal exists. For the output logic, refer to the separate table. Indicates the polarity of the horizontal synchronization signal. For the output logic, refer to the separate table. BA7078AF and, a capacitor between CC ...

Page 4

... VSYNC 5pin CVEXI V CC 7pin VSEPA V CC 60kΩ 1kΩ 4pin VIDEO 2kΩ 200Ω 3pin CPWID V CC 10pin BA7078AF C / HSYNC 670Ω 200Ω 2pin 10µA CVPOL V CC 200Ω 6pin CPSEL V CC 50kΩ 1kΩ 8pin 50kΩ ...

Page 5

... Multimedia ICs VDRV V CC 11pin HDRV V CC 13pin EXIH V CC 10kΩ 17pin GND 9pin POLV V CC 10kΩ 16pin EXIV V CC 10kΩ 15pin BA7078AF CLAMP V CC 12pin 14pin POLH V CC 10kΩ 18pin ...

Page 6

... V tCPL OUTPUT EXIH VSYNC EXIV H No signal Positive H H Negative H No signal L H Positive Negative L No signal Positive H Negative L BA7078AF Max. Unit Conditions 5 − V 0.5 V − mA 450 ns VSYNC IN − V 0.5 V − mA 115 HSYNC IN 145 ns VIDEO IN − V 0.5 V − mA ...

Page 7

... Posi. / Neg. 1.0~5.0V 1.0~5.0V P-P P-P − 40~200Hz − 8.0µs~Duty35% − 15k~200kHz − 94ns~Duty35% T=1/f Duty=pw/T(%) pwV (ex.pwV=1H) pwV Duty=pwH/TH(%) (ex.pwV=1H) BA7078AF CLAMP VIDEO CS VIDEO CS − − CS − CS Composite sync Sync on Video Posi. / Neg. Neg. 1.0~5.0V 0.2~0.6V P-P P-P 0~2.1V ...

Page 8

... SW5 4.7µF V5 75Ω 1MΩ 1.5µF 1µ HSCTL POLH HSYNC IN VIDEO IN 3 POLV 4 VSEPA 5 VSYNC IN 6 CVPOL HDRV 7 CVEXI CLAMP 8 VDRV CPSEL 9 CPWID GND Fig.1 BA7078AF 18 SW18 3mA Oscilloscope 17 EXIH SW17 3mA Oscilloscope 16 SW16 3mA Oscilloscope 15 EXIV SW15 ...

Page 9

... EXIV output voltage "H" EXIV output voltage "L" EXIV output current "L" EXIV output impedance Minimum synchronization separation level HSCTL "H" level threshold voltage HSCTL "L" level threshold voltage CPSEL "H" level threshold voltage CPSEL "L" level threshold voltage Switch condition BA7078AF ...

Page 10

... VSYNC 1MΩ 1.5µ 1µF CPSEL 8 OPEN : AUTO H : Front L : Back 9 H SYNC DET. SYNC SEPA. HOR. SYNC CONTROL V SYNC SEPA. V SYNC DET. CLAMP PULSE GEN. Fig.2 BA7078AF 18 POLH 17 EXIST H 16 POLV 15 EXIST 47µF 0.01µF 13 HDRV 12 CLAMP 11 VDRV 3.9kΩ 10 ...

Page 11

... C7 : 0.47µF Coupling capacitor for VSYNC IN A low capacitance increases the size of the input pin waveform’s sag 3.9kΩ A low resistance results in a narrow clamp pulse width. Set no lower than 1kΩ 1MΩ Discharge current setting resistor for CLAMP IN BA7078AF R RPM-850 LED ...

Page 12

... V CC 100 −50 − 100 TEMPERATURE : Ta (°C) Fig.7 VSYNC IN-VDRV Rising delay time vs. temperature 0.15 BA7078AF 160 140 120 100 Vcc=5.0V 0 −50 − 100 TEMPERATURE : Ta (°C) Fig.5 VIDEO IN−HDRV Rising delay time vs. temperature 3 2 ...

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