ROHM BA7149F Datasheet
1
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 signals 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 Limits Unit
8.0 V
500
∗
mW
°C
°C
V
CC Max.
– 20 ~ + 75
– 55 ~ + 125
Pd
Topr
Tstg
Applied voltage
Power dissipation
Operating temperature
Storage temperature
∗
Reduced by 5mW for each increase in Ta of 1°C over 25°C.
•
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ. Max. Unit
V
CC
4.5 5.0 5.5 V
Power supply voltage
2
Video ICs BA7149F
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Pin descriptions
FunctionFunction
19
210
311
412
513
614
715
816
Pin No. Pin No.
Vertical control input
Power supply 1
Vertical deflection drive (POS)
GND 1
Vertical deflection drive (NEG)
Vertical oscillator external resistor
Vertical oscillator external capacitor
VD output
HD output
GND 2
Video input
Power supply 2
Video output
Phase comparator output
Horizontal oscillator external resistor
Horizontal AFC output
•
Block diagram
16 15 14 13 12 11 10 9
12345678
H.OSC
PHASE
COMP
6dB
AMP
V.SEPA
V.OSCV.DRIVE
V.BLK
H.BLK
SYNC
SEPA
3
Video ICs BA7149F
•
Electrical characteristics (unless otherwise noted, Ta = 25°C and Vcc = 5.0V)
Parameter
Symbol Min. Typ. Max. Unit
I
CC
31.0 42.0 55.0 mA
G
V
5.3 6.0 6.7 dB
D
RV
3.20 3.50 —
f
C
– 2.0 0.0 + 2.0 dB
— 45 120
T
H · BL
9.6 10.7 11.4 µs
T
V · BL
870 970 1070 µs
f
H · O
13.9 15.7 17.5
∆f
CAP
± 2.1 ± 3.0 —
T
HP
10.2 11.1 12.0 µs
T
HPH
– 1.9 – 1.2 – 0.5 µs
V
HPL
0.5 1.1 1.7 V
f
V · O
51.3 54.8 58.2 Hz
2.10 2.70 —
2.10 2.70 —
T
HVD
17.3 21.3 25.3 µs
T
HD
8.7 9.9 11.1 µs
T
VD
860 960 1060 µs
V
HV · L
— 0.1 0.3 V
V
HV · H
4.7 4.9 — V
V
P-P
mV
P-P
V
P-P
V
P-P
kHz
kHz
V
syn · Min.
V
VP · Max.
V
VN · Max.
䊊Not designed for radiation resistance.
Operating current dissipation
Voltage gain
D range
Frequency characteristic
Minimum sync separation voltage
Horizontal blanking width
Vertical blanking width
Free-running frequency
Capture range
AFC output pulse width
AFC lock-in phase
Pulse voltage low
Free-running frequency
Pin 3 maximum output amplitude
Pin 5 maximum output amplitude
Phase difference
H
D pulse width
V pulse width
Pulse voltage low
Pulse voltage high
〈VIDEO AMP〉
〈
HD · VD〉
〈
Horizontal〉
〈
Vertical〉
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