Datasheet BA7622F Datasheet (ROHM)

1

Multimedia ICs

75Ω driver IC with 3 internal circuits

BA7622F

The BA7622F is a 75Ω driver-IC developed for use in video equipment. It includes three 75Ω driver circuis,two of
which have sync-tip clamp inputs.The other driver has a biased input terminated with a 20kΩ resistor.Each output
can drive two loads (75Ω × 2).

•

Applications

Video cassette recorders, televisions and camcorders

•

Features

1) Two built-in clamp circuits.

2) Simultaneous drive of Y, C and composite video sig­nals possible.

3) Each output can drive two loads.

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Absolute maximum ratings (Ta = 25°C)

Parameter

Symbol Limits Unit

8.0 V

Pd mW
Topr °C
Tstg °C

550

∗

V

CC

– 25 ~ + 75
– 55 ~ + 125

Power supply voltage
Power dissipation
Operating temperature
Storage temperature

∗

Reduced by 5.5mW for each increase in Ta of 1°C over 25°C.

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Multimedia ICs BA7622F

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Pin descriptions

1 GND
2 IN1

3 IN2

4 IN3
5

6 OUT3

7 OUT2

8 OUT1

Pin No.

V

CC

Ground connection
Clamp input

Input composite video or the Y signal separated from Y / C.
Clamp input

Input composite video or the Y signal separated from Y / C.
Biased input

Input the chroma signal. Terminated with a 20kΩ resistor.
Power supply

Biased output
Output for the signal input to IN3. When connected to earth a protection circuit operates,
and the IC enters power-save mode.

Clamped output
Output for the signal input to IN2. When connected to earth a protection circuit operates,
and the IC enters power-save mode.

Clamped output
Output for the signal input to IN1. When connected to earth a protection circuit operates,
and the IC enters power-save mode.

Pin name Function

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Block diagram

GND

IN1

IN2

IN3

OUT1

OUT2

OUT3

VCC

NO Clamp

Clamp

Clamp

20k

1

2

3

4

8

7

6

5

75Ω

driver

75Ω

driver

75Ω

driver

3

Multimedia ICs BA7622F

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Electrical characteristics (unless otherwise noted, Ta = 25°C and VCC = 5V, and load is two system drive)

Parameter

Symbol Min. Typ. Max. Unit

Conditions

4.5 5.0 5.5 V
—mA

V

om —

—

—

Gv 0 dB

Gf – 3 0 dB
DG1 — 0.4 1.0 %
DP1 — 0.4 1.0
DG2 — 0.7 2.0 %
DP2 — 0.7 2.0

C

T — – 60 — dB

— 0.1 0.5 %

ZIN3 17 20 23

2.8

– 1.2

23.6

3.3

– 0.6

35.4

1.3

deg

deg

V

CC

I

CC

V

P-P

kΩ

T

HD32

Operating voltage
Circuit current
Maximum output level
Voltage gain
Frequency characteristics
Differential gain 75Ω drive 1
Differential phase 75Ω drive 1
Differential gain 75Ω drive 2
Differential phase 75Ω drive 2
Interchannel crosstalk
Input impedance (VIN3)
Total-harmonic distortion (VIN3)

No signal
f = 1kHz, THD = 1.0%
f = 1MHz, V

IN = 2.0VP-P

10MHz / 1MHz, VIN = 1.0VP-P
VIN = 2.0VP-P, standard staircase signal
V

IN = 2.0VP-P, standard staircase signal

V

IN = 2.0VP-P, standard staircase signal

V

IN = 2.0VP-P, standard staircase signal

f = 4.43MHz, V

IN = 2.0VP-P

f = 1kHz, VIN = 1.0VP-P

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Input / output circuits

VCC

20k

6, 7, 8

OUT1, 2, 3

VCC

100µA

IN1, 2

2, 3

VCC

100µA

IN3

4

20k

10k

4

Multimedia ICs BA7622F

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Measurement circuit

123

4

SWC

V

CC = 5V

V

~~

OSC

SG

600

1µ 1µ1µ

200µA50µA

75

1000µ

+

75

75

75

OSC

SG

OSC

SG

V

~

600

1µ 1µ

1µ

4

V

CC = 5V

V

~~

600

1µ 1µ1µ

123

4

SWA

~

123

SWB

200

µA

V

CC = 5V

1

75Ω

driver

2

3

4

75Ω

driver

75Ω

driver

Clamp

Clamp

20k

NO Clamp

5

75

470µ

+

75

6

75

470µ

+

75

7

75

470µ

+

75

8

0.022µF

47µF

Analyzer

Audio

123

SWF

Vector

Scope

23

Analyzer

Audio

123

SWD

1

SWE

Vector
Scope

Analyzer

Audio

Vector
Scope

V

~

V

~

V

~

VCC = 5V

+

+++++++++

Fig.1

The circuit for driving one 75Ω output load.
The circuit for driving two 75Ω output loads is as.

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Multimedia ICs BA7622F

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Measurement conditions

IN1 IN2 IN3 OUT1 OUT2 OUT3

SWA SWB SWC SWD SWE SWF

333××× —

—

—

V

om12 1333××

∗

1Vom22 313× 3 ×

V

om32 331××3

G

v12 1333××

∗

2Gv22 313× 3 ×

G

v32 331××3

f12 1333××
f22 3 1 3 × 3 ×
f32 3 3 1 ××3

C

T112 1 3 3 × 3 ×

C

T113 1 3 3 ××3

C

T211 3133××

C

T213 3 1 3 ××3

C

T311 3313××

C

T312 3 3 1 × 3 ×

T

HD12 1333××

∗

4THD22 313× 3 ×

T

HD32 331××3

ZIN3 3 3 4

× × ×

∗

3

I

CC

Parameter Symbol Conditions

∗

1: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the input level until the output distortion is 0.5%. This output voltage

at this time is the maximum output level V

om (VP-P).

∗

2: Input a 2.0VP-P, 1MHz sine wave. The voltage gain is given by GV = 20 log (VOUT / VIN).

∗

3: Measure the input pin voltage VIN50 when a current of DC50µA is flowing into the input pin. Measure the input pin open-circuit voltage VIN0.

The input impedance is given by Z = (V

IN50 - VIN0) / 50∗10

-6

[Ω].

∗

4: Input a 1.0VP-P, 1kHz sine wave. Connect a distortion meter to the output and measure the total-harmonic distortion.

Current dissipation

Maximum output level

Voltage gain

Frequency characteristic

Interchannel crosstalk

Total-harmonic distortion

Input resistance

×

: Any of switches 1, 2, or 3 possible.

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Multimedia ICs BA7622F

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Application example

VCC = 5V

47µF 0.022µF

75

VIDEO

OUT1

75

1

2

3

4

8

7

6

5

75Ω

driver

75Ω

driver

75Ω

driver

Clamp

Clamp

1µF

20k

NO Clamp

1µF

0.01µF

Composite
Video
Signal

Y Signal

C Signal

1000µF

+

1000µF

+

1µF

+

YC

YC

75

75

75

75

VIDEO

OUT2

+

+

+

Fig.2

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Electrical characteristic curves

GAIN: GV (dB)

FREQUENCY: f (Hz)

20

0

– 20

–40

100k 1M 10M 100M

Fig. 3 Frequency characteristic

GAIN: GV (dB)

FREQUENCY: f (Hz)

0

–20

– 40

–60

–80

100k 10M 100M1M

Fig. 4 Crosstalk

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Multimedia ICs BA7622F

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Extermal dimensions (Units: mm)

SOP8

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

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1.5 ± 0.1