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1
Multimedia ICs
SYNC separator IC with AFC
BA7046 / BA7046F
The BA7046 and BA7046F separate the synchronization signals from a video signal and output the horizontal and
vertical synchronization signals (H
D and VD), and the composite synchronization signal (Sync-out).
The H
D and VD pulse phase difference is guaranteed.
•
Applications
TVs and VCRs
•
Features
1) Built-in AFC circuit.
2) H
D and VD phase difference guaranteed.
3) Low power dissipation. (approx. 21mW)
4) Low external parts count.
5) 8-pin DIP / SOP package.
6) Horizontal free-run frequency does not require
adjustment.
•
Absolute maximum ratings (Ta = 25°C)
BA7046 (DIP)
BA7046F (SOP)
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Unit
V
CC Max. 8.0 V
500
∗
mV
Topr °C
Tstg °C
Pd
Limits
– 20 ~ + 75
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
Reduced by 5mW for each increase in Ta of 1°C over 25°C.
Parameter Symbol Unit
8.0 V
350
∗
mW
Topr °C
Tstg °C
Pd
V
CC Max.
Limits
– 20 ~ + 75
– 55 ~ + 125
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
∗
When mounted on a 50mm × 50mm PCB board, reduced by 3.5mW for each increase in Ta of 1°C
over 25°C.
Parameter Symbol Min. Typ. Max. Unit
V
CC 4.5 — 5.5 VOperating power supply voltage
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2
Multimedia ICs BA7046 / BA7046F
•
Input / output circuits
VCC
1pin
1k
12k
100µA
Fig. 1
200
VCC
10k
4pin
Fig. 4
VCC
100
6pin
10µA
Fig. 5
8pin
V
CC
3k3k3k
3k3k3k
1k
Fig. 6
5k
VCC
2pin
200
Fig. 2
3pin
200
Fig. 3
•
Block diagrams
•
Pin descriptions
1
2
3
4
8
7
6
5
H. OSC
V. SEPA
PHASE
COMP
SYNC
SEPA
1
2
3
4
5
6
7
8
Pin No.
Horizontal oscillator resistor
H
D output
SYNC output (open collector)
V
D output
GND
Video input
Power supply
Phase comparator output
Function
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3
Multimedia ICs BA7046 / BA7046F
•
Electrical characteristics (unless otherwise noted Ta = 25°C and VCC = 5.0V)
Parameter Symbol Min. Typ. Max. Unit Conditions
I
Q
2.0 4.1 6.2 mA
—
0.08 0.15
—
0.1 0.3 V
4.7 4.9
—
V
13.9 15.7 17.5 kHz
±
2.1± 2.9
—
kHz
T
HPH
–
1.0 0
+
1.0µs pin2 pin– 6
T
HVD
17.0 23.5 30.0µs pin4 pin– 2
T
HD
4.6 5.1 5.6µs
pin2
TVD190 230 270µs pin4
V
syn-Min.
V
P-L
V
P-H
f
H-O
V
P-P
∆
f
CAP
pins 2, 4
䊊
Not designed for radiation resistance.
Quiescent current
Minimum synchronization separation level
Pulse voltage, LOW
Pulse voltage, HIGH
(Horizontal) free-running frequency
Capture range
Lock-in phase difference
H
D
, VD phase difference
H
D
pulse width
V
D
pulse width
pin 3 open
pin 6 terminated with 75
Ω
resistor
pins 2, 4
No input signal, I
1
=
open
•
Measurement circuit
8 7 6 5
1 2 3 4
II
100p
130k
V
T
V
T
V
T
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 R1.
(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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Multimedia ICs BA7046 / BA7046F
•
VIN, HD and VD timing charts
1 / 2H
(OUT)
V
D
Fig. 8
NTSC signal
Odd field (IN)
NTSC signal
Even field (IN)
H
D
Odd field (OUT)
H
D
Even field (OUT)
(1) The rise and fall positions for VD are basically the same for both odd and even fields.
(2) H
D shifts by 1 / 2H during the odd and even field interval.
(3) Only the odd field is given for the specification.
Vertical synchronization pulse interval
H
D, VD phase difference
Page 5
(1) Connect pin 1 to GND via a 120kΩ (approx.) resistor. Leave pins 2, 4 and 8 open.
(2) SYNC output polarity (pin 3) is positive.
(3) The delay time for rising edge of the SYNC output (pin 3) with respect to the falling edge of Sync for the Vsig
input signal (pin 6) is 850ns (reference value).
(4) The delay time for falling edge of the SYNC output (pin 3) with respect to the rising edge of Sync for the Vsig
input signal (pin 6) is 450ns (reference value).
•
Attached components
Resistor R
1 should have a tolerance of ± 2%, and a temperature coefficient of 100ppm or lower.
5
Multimedia ICs BA7046 / BA7046F
•
Application example
8
8
7
6
5
R
2
470k
H. OSC
V. SEPA
PHASE
COMP
SYNC
SEPA
C
2
C7
C1
C5
C6
R3
R4
0.022µ47µ
1µ
1µ
+
C3
+
+
2200p
1000p
470k
330
10k
R
3
470k
R
2
Vsig
C
4
100p
R
1
130k
H
D
SYNC
VD
10k
V
CC = 5V
R
5
10k
1
2
3
4
V
CC = 5V
C3-1
0.47µ
C
3-2
0.47µ
C
2
2200p
V
CC
∗
Fig.9
∗
By configuring the circuit enclosed in the dotted line to that in the
diagram on the right, you can decrease the lock-in time and increase the
capture range.
8
7
6
5
H. OSC
V. SEPA
PHASE
COMP
SYNC
SEPA
C
7
C1
C5
C6
R4
VCC = 5V
VCC = 5V
0.022µ47µ
1µ
+
+
1000p
470k
330
Vsig
R1
120k
H
D
SYNC
VD
10k
R
5
1
2
3
4
Fig. 10
• When SYNC SEPA output only is used. HD and VD unused.
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Multimedia ICs BA7046 / BA7046F
•
Electrical characteristic curves
HD · VD PULSE TIMING (µs)
– 25 0 25 50 75 100
40
30
20
10
0
50
60
70
NTSC
VCC = 5.0V
TEMPERATURE (°C)
Fig. 17 HD, VD phase difference vs.
temperature
FREQUENCY : f (csp. lock) (kHz)
POWER SUPPLY VOLTAGE (V)
20
15
10
4.5 5.0 5.5
+ lock
+ cap
– lock
– cap
Fig. 18 Capture range / lock range vs.
power supply voltage
FREQUENCY : f (csp.lock) (kHz)
TEMPERATURE (°C)
– 25 0 25 50 75 100
VCC = 5.0V
+ lock
+ cap
– lock
– cap
20
15
10
Fig. 19 Capture range charging / lock
range vs. temperature
HORIZONTAL FREQUENCY : f (kHz)
TEMPERATURE (°C)
15.2
VCC = 5.0V
15.4
15.6
15.8
16.0
16.2
16.4
16.6
– 25 0 25 50 75 100
Fig. 14 Horizontal free-running
frequency vs. temperature
HD PULSE WIDTH : HD (µs)
TEMPERATURE (°C)
NTSC
V
CC = 5.0V
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
– 25 0 25 50 75 100
Fig. 15 HD pulse width vs.
temperature
VD PULSE WIDTH : VD (µs)
TEMPERATURE (°C)
NTSC
V
CC = 5.0V
– 25 0 25 50 75 100
180
190
200
210
220
230
240
250
Fig. 16 VD pulse width vs.
temperature
CURRENT : ICC (mA)
POWER SUPPLY VOLTAGE (V)
6
5
4
3
2
1
0
4.0 5.0 6.0
Fig. 11 Quiescent current vs.
power supply voltage
CURRENT : ICC (mA)
TEMPERATURE (°C)
6.0
5.5
4.5
4.0
5.0
3.0
2.5
3.5
– 25 0 25 50 75 100
V
CC = 5.0V
Fig. 12 Quiescent current vs.
temperature
HORIZONTAL FREQUENCY : f (kHz)
POWER SUPPLY VOLTAGE (V)
16.4
16.2
16.0
15.8
15.6
15.4
15.2
4.5 5.0 5.5
Fig. 13
Horizontal free-running frequency
vs. power supply voltage
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Multimedia ICs BA7046 / BA7046F
•
Operation notes
• Make the ground line as thick as possible.
• Keep power supply noise to a minimum.
•
External dimensions (Units: mm)
SIGNAL - LOCK IN TIME (ms)
FREQUENCY (kHz)
13 14 15 16 17 18 19 20
300
200
100
0
V
CC = 5.0V
f
LOCK = 15.734kHz
Fig. 20 Time from no signal
to pull in
POWER LOCK IN TIME (ms)
FREQUENCY (kHz)
13 14 15 16 17 18 20
700
600
500
400
300
200
100
0
V
CC = 5.0V
f
LOCK = 15.734kHz
19
Fig. 21 Time from power
on to pull in
BA7046 BA7046F
DIP8 SOP8
0.5 ± 0.1
3.2 ± 0.2 3.4 ± 0.3
85
14
9.3
± 0.3
6.5 ± 0.3
0.3
±
0.1
0.51Min.
2.54
0° ~ 15°
7.62
0.4 ± 0.11.27
0.15
0.3Min.
0.15 ± 0.1
0.11
6.2 ± 0.3
4.4 ± 0.2
5.0 ± 0.2
85
41
1.5 ± 0.1
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