GT4122 Datasheet, PDF (1/5 Pages) Gennum Corporation – GT4122 Video Multiplier

GT4122 Video Multiplier
FEATURES
DESCRIPTION
DATA SHEET
• broadcast quality video multiplier
• 30 MHz at -1.0 dB video and control channel bandwidth
The GT4122 multiplier is a monolithic dual-channel,
broadcast quality video mixer.
• 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
PIN CONNECTIONS
-V_S
+V_S
COMP
C_OS1
C_OS2
S1
V_REF
S2
V_C
GND
T^TO^OP^P V^VI^IE^EWW
PIN 1
20
10
11
OUT
B_OS2
-IN B
+IN B
B_OS1
A_OS2
-IN A
+IN A
A_OS1
R_EXT
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:
V_OUT = V_A • V_C + V_B (1 - V_C)
where V_C is the control input voltage, which may be
varied continuously over the control range and V_A and V_B
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.
ORDERING INFORMATION
Part No.
GT4122 - CDF
GT4122 - CKF
Package Type
20 PDIP
20 SOIC
Temperature
0° to 70°C
0° to 70°C
PIN DESIGNATION
20 PIN DIP / SOIC
1 -V_S negative supply voltage
2 +V_S positive supply voltage
3 COMPoutput freq'y comp'n R-C
4 C_OS1 control input offset adjust
5 C_OS2 control input offset adjust
6 S1 span adjust
7 V_REF 0.5volt reference input
8 S2 span adjust
9 V_C control signal input
10 GND ground
11 R_EXT current setting resistor
12 A_OS1 A black level adjust (OFFSET)
13 +IN A A video + input signal
14 -IN A A video - signal input
15 A_OS2 A black level adjust (OFFSET)
16 B_OS1 B black level adjust (OFFSET)
17 +IN B B video + signal input
18 -IN B B video - signal input
19 B_OS2 B black level adjust (OFFSET)
20 OUT multiplier output
Revision Date: January 1994.
+IN A
- IN A
A OS1
A OS2
+IN B
- IN B
B OS1
B OS2
- VS
+VS
GND
+
AMP 1
XA
-
V_CA=0.5 + V_K
+
Σ1
+
+
AMP 2
-
XB
V_CB=0.5 - V_K
+ _{Σ2 + - VK}
V_NOM
+
0.5V
+
Σ3 ^{+ VK}
+ ^VNOM
-
-
AMP 4
BIAS
AMP 3
-
AK
+
COMP
OUT
REXT
VREF
VC
S1
S2
COS2
COS1
Device Function: V_OUT = V_INA • [V_NOM + A_K (V_C - V_REF)] + V_INB • [V_NOM - A_K (V_C - V_REF)]
FUNCTIONAL BLOCK DIAGRAM
Document No. 520 - 25 - 4
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone] fax: [phone]
Japan Branch: A-302, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan tel. [phone] fax: [phone]