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GT4124

更新时间： 2024-11-06 03:40:03
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GT4124 Video Multiplier with Strobed DC Restore

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GT4124 数据手册

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GT4124 Video Multiplier  
with Strobed DC Restore  
DATA SHEET  
FEATURES  
DESCRIPTION  
• broadcast quality video multiplier with a very accurate  
back porch clamp, (less than 2mV DC offset)  
• 30 MHz at -1.0dB video and control channel bandwidth  
• one external frequency compensation adjustment  
The GT4124 multiplier is a monolithic dual-channel video  
multiplier for use in the professional broadcast field. It  
incorporates a very fast and accurate strobed clamp to  
insure black level accuracy.  
• ultra low differential gain and differential phase,  
Featuring two wideband video inputs and a single control  
input, the GT4124 achieves high quality video mixing of  
the two synchronized video input signals to a single output  
by implementing the transfer function:  
(typically 0.01% and 0.01 deg.)  
• adjustable DC offset and span on the control input  
• adjustable clamp reference level  
• active low STROBE input  
V
= VIN • V + VIN (1 - V )  
C C  
• 20 pin PDIP and SOIC packaging.  
OUT  
B
A
where V is the control input voltage, which may be varied  
C
APPLICATIONS  
over the control range, and VIN and VIN are the video  
A
B
input signals.  
• Production switcher video mixers  
The GT4124 operates with power supply voltages of ± 9 to  
±12 volts. At a nominal supply of ± 10 volts, it draws an  
average of 20 mA of current. The GT4124 is available in  
20 pin PDIP and 20 pin SOIC packages.  
• Linear Keyers  
ORDERING INFORMATION  
Part Number Package Type Temperature Range  
An application note entitled "Using the GT4122 and GT4124  
Video Mixer ICs" (Document 520-44) is available from  
Gennum Corporation.  
GT4124-CDF 20 pin PDIP  
GT4124-CKF 20 pin SOIC  
0 to 70˚  
0 to 70˚  
PIN DESIGNATION  
C
HOLD  
STROBE  
+
1
2
3
4
5
6
7
8
9
+VS  
positvive supply voltage  
clamp holding capacitor  
output freq'y comp'n R-C  
control input offset adjust  
control input offset adjust  
span adjust  
+
-
IN A  
IN A  
CLAMP  
CLAMP REF.  
CLAMP SIG.  
AMP 1  
XA  
CHOLD  
COMP  
COS1  
COS2  
S1  
-
VIDEO  
INPUT A  
COMP.  
+
+
V
CA=0.5 + V  
K
Σ4  
AMP 4  
BIAS  
Σ1  
OUTPUT  
+
+
+
IN B  
+
AMP 2  
XB  
R
EXT  
-
IN B  
-
VREF  
S2  
0.5 volt reference input  
span adjust  
VIDEO  
INPUT B  
VCB=0.5 - V  
K
VCONT  
control signal input  
ground  
+
-
V
K
+
10 GND  
Σ2  
AMP 3  
-
11 STROBE strobe input  
V
REF  
V
K
+
A
K
Σ3  
12 REXT  
13 +IN A  
14 -IN A  
current setting resistor  
+
CONTROL  
VOLTAGE  
(V  
+
-
V
S
0.5V  
A video + signal input  
A video - signal input  
0.5V  
V
+
-
)
+
-
CONT  
V
NOM  
NOM  
+
V
S
S1  
S2  
15 CLAMP SIG clamp signal  
GND  
16 CLAMP REF clamp reference  
C
OS2  
17 +IN B  
18 -IN B  
B video + signal input  
B video - signal input  
C
OS1  
Device Function: VOUT = AOL [VA (0.5+VK) + VB(0.5 - VK)] where AOL ~ 2000, VK=VCONT - VREF, AK ≈ 0.85 REXT  
19 OUTPUT video output  
RSPAN  
20 -VS  
negative supply voltage  
FUNCTIONAL BLOCK DIAGRAM  
Revision Date: February 1994  
Document No. 520 - 59 - 2  
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  
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