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PDF BA7149F Data sheet ( Hoja de datos )

Número de pieza BA7149F
Descripción Electronic viewfinder driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA7149F Hoja de datos, Descripción, Manual

Video ICs
Electronic viewfinder driver
BA7149F
The BA7149F is an electronic viewfinder driver for video cameras. It separates the synchronous signal from the input
video signal, and outputs the vertical deflection drive output and horizontal deflection signals. HD and VD output sig-
nals with guaranteed phase difference are also provided for on-screen displays (OSD). The differences between the
BA7149F and the BA7148F are the horizontal blanking, horizontal AFC output, HD output phase and pulse width.
Applications
Video cameras
Features
1) Operates off a 5V power supply.
2) Built-in vertical deflection circuit.
3) Built-in wide-bandwidth amplifier.
4) Built-in HD and VD output terminals.
5) Few attached components required.
6) SOP 16pin package.
7) Compatible with 10µ sec flyback pulses.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Applied voltage
Power dissipation
VCC Max.
Pd
Operating temperature
Topr
Storage temperature
Tstg
Reduced by 5mW for each increase in Ta of 1°C over 25°C.
Limits
8.0
500
– 20 ~ + 75
– 55 ~ + 125
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

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BA7149F pdf
Video ICs
15pin
12pin
10k 10k 10k
+
V
2k 2k
2.8V
12k
15pin
Fig.10
Circuit operation
Input signals
Pulse IH
16pin
12pin
20k
20k
2pin
500
16pin
Fig.11
IH
63.556µ
0.29V at 11pin
H Pulse only
Pulse IS
Pulse IV
adj.at 11pin
4.7µ
262.5H
16.683m
H Pulse only
V Pulse only
BA7149F
Fig.12
The video signal input to pin 11 is detected by the charg-
ing and discharging of an external capacitor. Sync sepa-
ration is done in the SYNC SEPA block. The H. SYNC
signal is sent to the H. OSC, and the V. SYNC signal is
sync-separated in the vertical sync pulse interval and sup-
plied to the V. OSC block.
The H. OSC block consists of a PLL that oscillates in sync
with the sync-separated H. SYNC signal, and outputs the
HD pulse and horizontal deflection pulse.
In the V. OSC block, a direct-control method is used with
the sync signal. To synchronize the vertical oscillator cir-
cuit, the inherent oscillation period of the oscillation circuit
is made slightly larger than the vertical sync signal period,
so that the sync signal always enters slightly early.
The oscillator output alone is not enough to ensure stable
operation for the vertical deflection output circuit, so it is
amplified by the V. DRIVE block.
The horizontal and vertical blanking signals generated in
the H. OSC and V. OSC blocks are used to erase the hor-
izontal retrace line from the video signal input to pin 11.
The signal is inverted and amplified by a 6dB inverting
amplifier and output as a negative-polarity video signal.
5

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