ROHM BA7062F Datasheet
1
Multimedia ICs
SYNC separator IC with AFC
BA7062F
The BA7062F separates the synchronization signals from a video signal and outputs the horizontal and vertical synchronization signals (H
D and VD), and the composite synchronization signal (Sync-out).
The H
D and VD pulse widths are different.
•
Applications
TVs and VCRs
•
Features
1) Built-in AFC circuit.
2) Low power dissipation (approx. 21mW).
3) Low external parts count.
4) SOP 8-pin package.
5) Horizontal free-run frequency does not require adjustment.
1
2
3
4
8
7
6
5
PHASE
COMP
H.OSC
SYNC
SEPA
V.SEPA
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Block diagram
•
Absolute maximum ratings (Ta = 25°C)
Parameter Symbol Limits Unit
8.0 V
350
∗
mW
°C
°C
V
CC Max.
Pd
Topr
Tstg
– 20 ~ + 75
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
When mounted on a 50mm × 50mm PCB, reduced by 3.5mW 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 — 5.5 VOperating power supply voltage
2
Multimedia ICs BA7062F
VCC
1pin
1k
12k
100µA
Fig. 1
2pin
V
CC
200
5k
Fig. 2
3pin
200
Fig. 3
VCC
4pin
200
10k
Fig. 4
VCC
6pin
100
10µA
Fig. 5
VCC
8pin
1k
3k
3k 3k
3k 3k 3k
Fig. 6
•
Input / output circuits
•
Pin descriptions
Pin No.
1
2H
D
3
4V
D
5
6
7
8
Horizontal oscillator resistor
H
D output
SYNC output (open collector)
V
D output
GND
Video input
Power supply
Phase comparator output
Function
3
Multimedia ICs BA7062F
•
Electrical characteristics (unless otherwise noted, Ta = 25°C and VCC = 5V)
Parameter Symbol Min. Typ. Max. Unit
I
Q
2.0 4.1 6.2 mA
V
syn-Min.
— 0.08 0.15 V
P-P
V
P-L
— 0.1 0.3 V
V
P-H
4.7 4.9 — V
f
H-O
13.9 15.7 17.5 kHz
± 2.1 ± 2.9 ——kHz
T
HPH
– 1.0 0 + 1.0 µs
T
HD
10.5 11.5 12.5 µs
T
VD
200 260 320 µs
∆f
CAP
Quiescent current
Minimum SYNC separation level
Pulse voltage, Low
Pulse voltage, High
Capture range
Lock-in phase
H
D pulse width
V
D pulse width
Conditions
2pin
4pin
2pin – 6pin
Pin 3 open
Pin 6 terminated with 75
Ω resistor
2, 4 pin
2, 4 pin
No input signal, I
1
= open
䊊 Not designed for radiation resistance.
(Horizontal)
free-running frequency
•
Measurement circuit
8 7 6 5
1 2 3 4
II
100p
130k
V
T
V
T
V
T
1µ
1µ
1µ
75
Video In
+
+
+
A
47µ
0.022µ
39k
VCC
2200p
470k
10k V
CC
Fig. 7
•
Circuit operation
(1) Synchronization separation circuit
Detects the charging current to a externally-connected
capacitor, and performs synchronization separation.
(2) Horizontal oscillation circuit
When a video signal is input, it is synchronized with
Hsync by the PLL. The horizontal free-running frequency is determined by external resistor R
1.
(3) Vertical synchronization separation circuit
When a video signal is input, synchronization signal
separation is done over the vertical synchronization
pulse interval.
f
H-O = [kHz]
2.05E6
R
1
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