Datasheet BA7665FS Datasheet (ROHM)

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

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Multimedia ICs BA7665FS

•

Measurement conditions

Parameter

Symbol

Measurement

method

Switch conditions

Circuit current

Maximum
output level

Frequency
characteristics

Crosstalk

Mute attenuation

Chroma mute attenuation

Input impedance

Voltage gain

Inter-channel
voltage gain differential

ICC
VOM1
VOM2
VOM3

GF1
GF2
GF3
GT1
GT2
MT1
MT2

MT3
MTC1
MTC2

ZIN
GV1
GV2
GV3

∆GVC

OUTA

MIXOUT

OUTB
OUTA

MIXOUT

OUTB
OUTB→OUTA
OUTA→OUTB

OUTA

MIXOUT

OUTB

MIXOUT

OUTB

OUTA

MIXOUT

OUTB

Note 1

Note 2

Note 3

Note 4

Note 5

Note 5

Note 6

Note 7

Note 8

SW

1

2
3
3
3
3
3
3
3
3
1
1
1
3
3
3
3
3
3

—

SW

2

1
2
2
1
2
2
1
1
2
2
2
1
1
1
1
2
2
1

—

SW

7

1
1
1
2
1
1
2
2
1
1
1
2
2
2
3
1
1
2

—

SW

8

2
3
3
3
3
3
3
3
3
3
3
3
1
1
3
3
3
3

—

SW

16

1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

—

∗

The mute switch level was substituted by using H = 2.4V and L = 1.1V for the above measurements.

—

—

Measurement method

Note 1: Measure the quiescent current.
Note 2: Connect a distortion meter to the output, and input a f = 1kHz sine wave.

Adjust the output level until the output distortion is 1%. The output voltage at this time is the maximum output level V

OM [VP-P].

Note 3: Input 1V

P-P, 7MHz and 1MHz sine waves, and measure the corresponding outputs VO7 and VO1. The frequency characteristic is given by

G

F = 20

∗

Log (VO7 / VO1) [dB].

Note 4: Input a 1V

P-P, 4.43MHz sine wave, and measure the output Vo [VP-P] The interchannel crosstalk is given by CT = 20

∗

Log (VO / VIN) [dB].

Note 5: Input a 1V

P-P, 4.43MHz sine wave, and measure the output Vo [VP-P] The mute attenuation is given by

M

T = 20

∗

Log (VO / VIN) [dB].

Note 6: Measure the input pin voltage V

IN50 when a current of DC50µA is flowing into the input pin. Measure the input pin open-circuit voltage.

The input impedance is given by

Z

IN = | VIN50 – VIN0 | / 50

∗

103[kΩ].

Note 7: Input a 1V

P-P, 4.43MHz sine wave, and measure the output VO [VP-P] The voltage gain is given by

Gv = 20 ∗log (V

O / VIN) [dB].

Note 8: ∆G

VC = | GV1 – GV2 | [dB]

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Multimedia ICs BA7665FS

Parameter

Symbol Min. Typ. Max. Unit Conditions
Voltage gain
Interchannel voltage gainGv∆Gv

5.5

– 0.5

6.0

0.0

6.5

0.5

dBdBf = 4.43MHz, 1VP-P

f = 100kHz, 1VP-P

•

Guaranteed design values (unless otherwise noted, Ta = 25°C, VCC = 5V)

•

Mute SW mode settings

3ch MUTE

• MUTEA (1pin)
H

NORMALL

CHROMA MUTE

• MUTEB (8pin)
H

NORMALL

•

Pin descriptions and equivalent I / O circuits

Pin. No Pin name IN OUT

Standard potential

Equivalent I / O circuit Pin description

1 MUTEA

MUTEB

K ——

K — 2.0V

K — 2.0V

—— 0V

1
8

2

7

3
4
5

INA

INB

GND

Mute control pin
When MUTE A (pin 1) goes high, all

three channels are muted at the same
time. When MUTE B (pin 8) goes
high, OUTB and the MIXOUT chroma
signals are muted.

Signal input pin
This is the input pin for the composite

Y signal (sync-tip clamp input).

Ground pin

Signal input pin
Bias-type input pin for the chroma

signal. The input impedance is 20kΩ.

15k

8k

20k

↓

↓

GND

6

Multimedia ICs BA7665FS

Pin. No Pin name IN OUT

Standard voltage

Equivalent I / O circuit Pin description

9 OUTB — K 2.4V

— K

0.9V

0.95V

1112MIXOUT2

MIXOUT1

— K

0.9V

0.95V

14
15

OUTA2
OUTA1

——

5.0V

5.0V

13
16

V

CC2

V

CC1

Signal output pin
Chroma signal output pin. When this

drops below 0.2V, the protection
circuit operates and the IC enters
power save mode.

Signal output pin
Y / C signal output pin. Pin 11 is the

sag compensation pin. When pin 12 is
taken below 0.2V, the protection cir­cuit operates and the IC enters power
save mode.

Signal output pin
Composite Y signal output pin. Pin 14

is the sag compensation pin. When
pin 15 is taken below 0.2V, the
protection circuit operates and the IC
enters power save mode.

Power supply pin
V

CC1 and VCC2 are not connected

internally. Use with them connected
externally.

11pin

12pin

14pin

15pin

VCC

7

Multimedia ICs BA7665FS

+

6dB

Mute

75Ω

6dB 75Ω

6dB 75Ω

6dB 75Ω

N.C.

20k

N.C.

+

+

++

75Ω

75Ω

75Ω

75Ω

100µF

22µF

++

75Ω

+

75Ω

100µF

75Ω

75Ω

0.1µF

1000µF

22µF

47µF

1µF

0.1µF

0.1µF

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Composite Y

Chroma

Chroma Mute

When you will not use the sag compensation function

Fig.2

•

Application example

8

Multimedia ICs BA7665FS

SSOP-A16

0.36 ± 0.10.8

0.11

6.6 ± 0.2

4.4 ± 0.2

6.2 ± 0.31.5 ± 0.1
1

16

8

9

0.15

0.3Min.

0.15 ± 0.1

•

External dimensions (Units: mm)