ROHM BA7071F Datasheet
1
Multimedia ICs
SYNC separator IC with AFC
BA7071F
The BA7071F contains a video synchronization separation circuit, a vertical video synchronization separation circuit,
a horizontal oscillation circuit, and a phase comparator. It separates and outputs the horizontal and vertical synchronization signals (HD and VD), and the composite synchronization signal (Sync-out) from input video or composite
synchronization signals. The phase difference between HD and VD is guaranteed for both the rising and falling
edges of VD.
•
Applications
TVs, VCRs and camcorders
•
Features
1) Built in AFC circuit.
2) HD and VD phase difference guaranteed.
3) Wide supply voltage range (3V to 7V).
4) Horizontal free-run frequency does not require adjustment.
5) Low external parts count.
6) SOP 8-pin package.
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits Unit
8.0 V
350
∗
mW
Topr °C
°C
V
CC
Tstg
Pd
– 20 ~ + 75
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
Reduced by 3.5mW for each increase in Ta of 1°C over 25°C.
Parameter Symbol Min. Typ. Max. Unit
2.85 — 7.5 VV
CCPower supply voltage
•
Absolute maximum ratings (Ta = 25°C)
2
Multimedia ICs BA7071F
•
Pin descriptions
Pin No.
1V
IN
2 HD - OUT
3 GND
4 PD - OUT
5 HOSC - R
6V
CC
7 VD - OUT
8 Sync - OUT
Video input
HD output
GND
Phase comparator output
Horizontal oscillator resistor
Power supply (V
CC)
VD output
Synchronization signal output
FunctionPin name
•
Block diagram
1
2
3
45
6
7
8
Vsepa
VCO
VIN
HD - OUT
GND
PD - OUT
Sync - OUT
VD - OUT
V
CC
HOSC - R
SYNC
SEPA
PD
COMP
3
Multimedia ICs BA7071F
5pin
1pin
2pin
4pin
VCC
VCC
VCC
VIN HOSC - R HD - OUT
VCC
VD - OUT PD - OUT Sync - OUT
8pin
V
CCVCC
7pin
•
Input / output circuits
•
Electrical characteristics (unless otherwise noted Ta = 25°C and VCC = 5.0V)
pin 2 pin – 1
pin 7 pin – 2 (FLD1)
pin 7 pin – 2 (FLD1)
pin 2
pin 7
pin 1 pin – 7
Parameter Symbol Min. Typ. Max. Unit Conditions
3.0 5.8 8.6 mA
0.08 0.15
V
p
-L ——0.1 0.3
Vsyn-min
Vp-H
f
H.O
T
HPH
T
HVD1
T
HVD2
T
HD
T
VD
T
INVD
I
Q
∆f
CAP
4.7
13.5
2.3
0.6
19.0
19.0
9.0
249
41.0
5.0
15.7
2.7
1.6
24.0
24.0
10.0
254
48.0
—
17.9
——
2.6
29.0
29.0
11.0
259
55.0
V
V
kHz
kHz
µs
µs
µs
µs
µs
µs
V
P-P
pins 2, 7
pins 2, 7
pin 8 open
pin 1 terminated with 75Ω
resistor
No input signal
Quiescent current
Minimum SYNC separation level
Pulse voltage low
Pulse voltage high
Capture range
Lock-in phase
HD, VD phase deviation 1
HD, VD phase deviation 2
HD pulse width
VD pulse width
V
IN
, VD phase difference
(Horizontal)
free-running frequency
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