ROHM BA7665FS Datasheet

1

Multimedia ICs

3-channel 75Ω driver with Y / C MIX

BA7665FS

The BA7665FS has three 75Ω driver circuits with 6dB amplifiers, and includes a Y / C MIX circuit. The IC can pro­vide a 75Ω drive with a composite Y signal, C signal, or a Y / C MIX signal. Dual-circuit drive capacity for each load
is provided, and a sag compensation function is provided to allow use of smaller coupling capacitors.
The composite Y signal input is a sync-tip clamp input, and the chroma input is a biased input.
The three channels can be simultaneously muted, or the chroma signal only (in the case of C / Y output, only Y is
output), and output short circuit protection and power save circuits are also provided.

•

Applications

Digital AV equipment, DVD and DVC players

•

Features

1) Y / C MIX circuit.

2) Low power consumption (typ. 130mW).

3) Output mute circuit.

4) Power save circuit.

5) Output protection circuit.

6) Sag compensation circuit allows small output cou­pling capacitors.

7) Two-circuit drive possible for loads.

8) Compact SSOP-A 16-pin package.

•

Absolute maximum ratings (Ta = 25°C)

Parameter Symbol Limits Unit
Power supply voltage
Power dissipation
Operating temperature
Storage temperature

V

CC

Pd
Topr
Tstg

8

650

∗

– 25 ~ + 75

– 55 ~ + 125

V

mW

°C
°C

∗

Reduced by 6.5mW for each increase in Ta of 1°C over 25°C.

•

Recommended operating conditions (Ta = 25°C)

Parameter Symbol UnitMax.Typ.Min.

Power supply voltage

V

CC 4.5 5.55.0 V

䊊 Not designed for radiation resistance.

2

Multimedia ICs BA7665FS

•

Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5V)

Parameter

Symbol Min. Typ. Max. Unit Conditions
Circuit current
Maximum output level
Frequency characteristics
Inter channel crosstalk
Mute attenuation
Mute switch high level
Mute switch low level
Input impedance

I

CC

Vom

Gf
CT
MT

VTHH
VTHL

ZIN

13.0

2.6

– 1.0

—
—

2.5
0

16

26.0

3.0

0.0
– 60
– 60

—
—
20

39.0
—

1.0
—
—

V

CC

1.0
24

mA

V

P-P

dB
dB
dB

V
V

kΩ

No signal
f = 1kHz, THD = 1 %
f = 7MHz / 1MHz, 1V

P-P

f = 4.43MHz, 1VP-P
f = 4.43MHz, 1VP-P

Chroma input pin (pin 7)

•

Block diagram

+

6dB

Mute

75Ω

6dB 75Ω

6dB 75Ω

20k

1

2

3

4

5

6

7

8

MUTEA

INA

GND

GND

GND

N.C.

INB

MUTEB

16

15

14

13

12

11

10

9

V

CC1

OUTA1

OUTA2

V

CC2

MIXOUT1

MIXOUT2

N.C.

OUTB

Chroma Mute

3

Multimedia ICs BA7665FS

•

Measurement circuit

+

6dB

Mute

75Ω

6dB 75Ω

6dB 75Ω

N.C.

N.C.

20k

+

++

100µF

22µF

0.1µF47µF

1

3.3V

1.2V

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Chroma Mute

A

V

++

100µF

22µF

V

0.1µF

V

SW16

1

2

75Ω

75Ω

75Ω

1

1

2

2

3

SW1

SW2

+

1µF

+

1µF

1

2

3

1

2

3

0.1µF

0.1µF

3.3V

1.2V

SW7

SW8

V

Fig.1