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GT4122-CDF Datasheet(PDF) 1 Page - Gennum Corporation

Part # GT4122-CDF
Description  GT4122 Video Multiplier
Download  5 Pages
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Manufacturer  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GT4122-CDF Datasheet(HTML) 1 Page - Gennum Corporation

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background image
-VS
+VS
COMP
COS1
COS2
S1
VREF
S2
VC
GND
OUT
BOS2
-IN B
+IN B
BOS1
AOS2
-IN A
+IN A
AOS1
REXT
20
11
10
PIN 1
TOP VIEW
Document No. 520 - 25 - 4
DATA SHEET
GT4122 Video Multiplier
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Japan Branch: A-302, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan
tel. (03) 3334-7700
fax: (03) 3247-8839
DESCRIPTION
The GT4122
multiplier is a monolithic dual-channel,
broadcast quality video mixer.
Featuring two wideband video inputs and a single control
input, the GT4122 achieves high quality video mixing of
the two video input signals to a single output by implementing
the function:
VOUT = VA • VC + VB (1 - VC)
where VC is the control input voltage, which may be
varied continuously over the control range and VA and VB
are the video input signals.
The GT4122 operates with power supply voltages of
± 10
volts and typically draws 24 mA of current. The GT4122
is available in a 20 pin DIP and 20 pin SOIC packaging.
An Application Note entitled ‘Using the GT4122 and
GT4124 Video Mixer ICs’ (Gennum Document 520-44) is
available from Gennum Corporation.
FEATURES
• broadcast quality video multiplier
• 30 MHz at -1.0 dB video and control channel bandwidth
• one external frequency compensation adjustment
• ultra low differential gain and differential phase,
(typically 0.01 % and 0.01 deg.)
• external DC offset and span trims
• 20 pin PDIP and SOIC packaging
APPLICATIONS
• Production switcher video mixers
• Linear Keyers
Part No.
Package Type
Temperature
GT4122 - CDF
20 PDIP
0
° to 70°C
GT4122 - CKF
20 SOIC
0
° to 70°C
ORDERING INFORMATION
PIN CONNECTIONS
TOP VIEW
20 PIN DIP / SOIC
REXT
COS1
VREF
COS2
VC
+
-
- VS
GND
A OS2
+IN A
- IN A
B OS2
- IN B
VCA=0.5 + VK
+IN B
+VS
B OS1
A OS1
BIAS
AMP 3
S1
S 2
COMP
OUT
VNOM
AMP 1
AMP 2
+
-
+
-
XA
VCB=0.5 - VK
XB
+
+
AMP 4
-
+
AK
0.5V
Σ2
Σ3
+
-
+
-
+
+ VK
- VK
+
+
Σ1
VNOM
Device Function: VOUT = VINA • [VNOM + AK (VC - VREF)] + VINB • [VNOM - AK (VC - VREF)]
FUNCTIONAL BLOCK DIAGRAM
1-VS
negative supply voltage
2+VS
positive supply voltage
3
COMP output freq'y comp'n R-C
4COS1 control input offset adjust
5COS2 control input offset adjust
6
S1
span adjust
7VREF
0.5volt reference input
8
S2
span adjust
9
VC
control signal input
10
GND ground
11
REXT
current setting resistor
12
AOS1 A black level adjust (OFFSET)
13
+IN A A video + input signal
14
-IN A A video - signal input
15
AOS2 A black level adjust (OFFSET)
16
BOS1 B black level adjust (OFFSET)
17
+IN B B video + signal input
18
-IN B B video - signal input
19
BOS2 B black level adjust (OFFSET)
20
OUT
multiplier output
PIN DESIGNATION
Revision Date: January 1994.


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