ROHM BA7046F, BA7046 Datasheet

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

2

Multimedia ICs BA7046 / BA7046F

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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

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Block diagrams

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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

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

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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

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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