Gennum Corporation GT4123BCDA, GT4123BCTA, GT4123BCKA Datasheet



Video Multiplier

DATA SHEET

GT4123B Two Channel

FEATURES

• two-quadrant video multiplication

• operation from

• 20 MHz

±0.1 dB video & control channel bandwidth

±4.5 V to ±13.2 V supply voltages

• ultra low differential gain & differential phase

• convenient 8 pin package

APPLICATIONS

• Multimedia Graphics Overlay

• Production Switchers

• Linear Keyers

PIN CONNECTIONS

GT4123B

OUTPUT

FREQ. COMP

CONTROL

GROUND

1

2

3

4

8

7

6

5

V

cc

VIDEO IN B

V

EE

VIDEO IN A

DESCRIPTION

The GT4123B is a monolithic dual-channel video multiplier
for use in a wide range of applications including broadcast
and multimedia.

Featuring two wideband video inputs and a single control
input, the GT4123B achieves broadcast quality mixing of
two video input signals to a single output by implementing
the function:

V

= [ ( VC • VA) + (1 - VC) • VB ]

O

where V
continuously over the range 0 V to 1 V, and V
the video input signals.

is the control input voltage, which may be varied

C

and VB are

A

The GT4123B is a low power version of the GT4123 and
GT4123A Video Multipliers which operates from ±5 V
supply voltages and typically draws only 15 mA of current.

FUNCTIONAL BLOCK DIAGRAM

VIDEO IN A

VIDEO IN B

MULTIPLIER

CORE

FREQ
COMP

OUTPUT

CONTROL

ORDERING INFORMATION

V

(0.5V)

REF

Part Number Package Type Temperature Range

o

o

to 70

GT4123BCDA 8 pin PDIP 0
GT4123BCKA 8 pin SOIC 0
GT4123BCTA 8 pin SOIC Tape 0

o

to 70

o

to 70

C

o

C

o

C

GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone] fax: [phone]

Japan Branch: A-302, Mi yamae Village, 2–10–42 Mi yamae, Suginami–ku Tokyo 168, Japan tel. [phone] fax [phone]

(INTERNAL)

Document No. 521 - 20 - 01

ABSOLUTE MAXIMUM RATINGS

PARAMETER VALUE/UNITS

Supply Voltage ±13.5 V
Operating Temperature Range 0°C ≤ TA ≤ 70°C
Storage Temperature Range -65°C ≤ T
Lead Temperature (soldering, 10 seconds) 260°C
Video Input Voltage ±5 V
Control Input Voltage ±5 V
Video Input Differential Voltage ±5 V

ELECTRICAL CHARACTERISTICS GT4123B

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER

SUPPLIES

SIGNAL

PATH

CONTROL

CHANNEL

NOTE: 1. V

521 - 20 - 01

Supply Voltage ± V
+ Supply Current I+ - 15 19.5 mA

- Supply Current I- - 15 19.5 mA
Common Mode Input Signal V

Bandwidth BW

Differential Gain ∂gV

Differential Phase ∂pV

PP Signal / RMS Noise S/N V
Gain A
Delay td
Power Supply Rejection PSRR ƒ = 1 kHz 70 - - dB
Ratio ƒ = 10 MHz 25 - - dB
Off Isolation & Crosstalk V

Output Offset Channel A or Channel B - - ±15 mV
Offset Difference Channel A - Channel B 0 - ±5mV
Input Resistance R
Input Capacitance C
Output Resistance R
Output Capacitance C
Bandwidth BW
Delay t
Linearity - - 1.5 %
Control Breakthrough VC = 0 to 1 V ƒ
Crossfade Balance VC = 0 to 1 V ƒ

Control Range V

= +1 Vp-p, output taken from OUTPUT

A or B

2 . V

= +1 Vp-p, output taken from V

C

S

IN CM

0.05

BW

0.1

V

SIG

A or B/VO

VC/V

A or B

IN

IN

OUT

OUT

at ±0.1 dB, V

0.1

D CONT

C

V

or

A

B

CAUTION

ELECTROSTATIC

SENSITIVE DEVICES

DO NOT OPEN PACKAGES OR HANDLE

EXCEPT AT A STATIC-FREE WORKSTATION

≤150°C

S

V

= ±5V, T

S

= 0°C to 70°C, RL=10kΩ, CL=10pF unless otherwise shown.

A

± 4.5 ±5 ±13.2 V

Supply Voltage = ±5 V
Positve Excursion Limit - - 2.2 V
Negative Excursion Limit - - -3.5 V
±0.05 dB, VIN= 150 mVp-p 10 - - MHz

±0.1 dB, V

= 40 IRE, 0V CM - 0.01 0.02 %

IN

= 150 mVp-p 20 25 - MHz

IN

at 3.58 MHz and 4.43 MHz

= 40 IRE, 0V CM - 0.01 0.03 deg

IN

at 3.58 MHz and 4.43 MHz

= 1 Vp-p, 60 70 - dB

SIG

100 kHz (ß = 100%) -0.02 -0.005 - dB

-410ns

ƒ

= 5 MHz (see note 1) 70 75 - dB

SIG

ƒ

= 5 MHz (see note 2) 80 85 - dB

SIG

ƒ=1 MHz 100 - - kΩ

- 2.0 - pF

ƒ=1 MHz - - 0.50 Ω

- 2.0 - pF

= 150 mVp-p 15 20 - MHz

IN

-410ns

=1 to 10 MHz - - -35 dB

C

= 3.58 MHz -15 0 +15 mV

C

0- +1V

2