ROHM BA7653AF Datasheet

1

Multimedia ICs

Video signal switcher, 1 × 3-channel
with clamped-input

BA7653AF

The BA7653AF is a video-signal switching IC that contains a three-channel clamped-input multiplexer. The inputs
are sync-tip clamped (synchronous edge of the video input signals are aligned to the same voltage), and as the input
impedance is extremely large, it is possible to use a small value for the clamp capacitor (the recommended capacitor
is 0.01µF (FZ) ceramic).

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Applications

Video cassette recorders, television and camcorders

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Features

1) Small clamp capacitors can be used (ceramic,
3000pF (Min.), 0.01µF (FS) (recommended)).

2) Low supply voltage operation possible. Supply volt­age range is 3.7V to 7.7V.

3) Superimposition used for fast switching speed with
low switching noise (70nsec. Typ.).

4) Low power consumption (when V

CC = 5V, 25mW

Typ.).

5) Wide dynamic range (3.1V

P-P Typ. for VCC = 5V).

6) Excellent frequency characteristics (10MHz, 0dB
Typ.).

7) Low interchannel crosstalk ( – 70dB Typ.).

8) Voltage can be applied to the control pins even
when V

CC is not applied.

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Absolute maximum ratings (Ta = 25°C)

Parameter

Symbol Limits Unit

V

CC 9V

mW
Topr °C
Tstg °C

500

∗

Pd

– 25 ~ + 75
– 55 ~ + 125

Applied voltage
Power dissipation
Operating temperature
Storage temperature

∗

When mounted on a 50mm × 50mm board, reduced by 5mW for each increase in Ta of 1°C over 25°C.

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Recommended operating conditions (Ta = 25°C)

Parameter Symbol Limits Unit

V

CC V4.0 ~ 7.0

Power supply voltage

2

Multimedia ICs BA7653AF

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Electrical characteristics (unless otherwise noted, Ta = 25°C and VCC = 5.0V)

Parameter Symbol Unit ConditionsMin. Typ. Max.

V

CC 3.7 — —

—

7.7 V

I

CC 2.7 5.0 8.2 mA

V

om 2.6 3.1 — VP-P

GV – 0.5 0 dB
C

ta – 70 dB

G

f – 3.0 0 dB

V

TH L — — 1.0

V

V

TH H 2.5 — —

45

× 20 (V)

V

CC – VF

VTH =

——

f = 1kHz, THD = 1.0%
f = 1MHz, V

IN = 1.0VP-P

f = 4.43MHz, VIN = 1.0VP-P
f = 10MHz / 1MHz, VIN = 1.0VP-P

VCC – CTL Threshold Level

0.5

1.0

Operating voltage
Supply current
Maximum output level
Voltage gain
Interchannel crosstalk
Frequency characteristic

CTL switching voltage

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Guaranteed design parameters (unless otherwise noted, Ta = 25°C and VCC = 5.0V)

Parameter Symbol Unit ConditionsMin.

DG — 0 0.5 %
DP — 0.5 1.0 deg

Typ. Max.
Differential gain
Differential phase

V

IN = 1.0VP-P, standard staircase signal

V

IN = 1.0VP-P, standard staircase signal

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Pin descriptions

1 IN1
2 CTLa
3 IN2
4 CTLb
5 IN3
6V

CC

7OUT
8GND

Pin No. Pin name

Input 1
Control input a
Input 2
Control input b
Input 3
Supply voltage
Output
GND

Function

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Control pin truth table

CTLa CTLb OUT

L L IN1
H L IN2
L H IN3
H H IN3

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Block diagram

1

2

3

4

8

7

6

5

IN1

CTLa

IN2

CTLb

GND

OUT

IN3

Logic

VCC