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GT4123BCKA PDF даташит

Спецификация GT4123BCKA изготовлена ​​​​«ETC» и имеет функцию, называемую «Two Channel Video Multiplier».

Детали детали

Номер произв GT4123BCKA
Описание Two Channel Video Multiplier
Производители ETC
логотип ETC логотип 

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GT4123BCKA Даташит, Описание, Даташиты
GT4123B Two Channel
Video Multiplier
DATA SHEET
FEATURES
two-quadrant video multiplication
operation from ±4.5 V to ±13.2 V supply voltages
20 MHz ±0.1 dB video & control channel bandwidth
ultra low differential gain & differential phase
convenient 8 pin package
APPLICATIONS
Multimedia Graphics Overlay
Production Switchers
Linear Keyers
PIN CONNECTIONS
GT4123B
OUTPUT 1
FREQ. COMP
CONTROL
GROUND
2
3
4
8 Vcc
7 VIDEO IN B
6 VEE
5 VIDEO IN A
ORDERING INFORMATION
Part Number
GT4123BCDA
GT4123BCKA
GT4123BCTA
Package Type
8 pin PDIP
8 pin SOIC
8 pin SOIC Tape
Temperature Range
0o to 70o C
0o to 70o C
0o to 70o C
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:
VO = [ ( VC • VA) + (1 - VC) • VB ]
where VC is the control input voltage, which may be varied
continuously over the range 0 V to 1 V, and VA and VB are
the video input signals.
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
CONTROL
MULTIPLIER
CORE
FREQ
COMP
OUTPUT
VREF (0.5V)
(INTERNAL)
Document No. 521 - 20 - 01
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-2055
Japan Branch: A-302, M i yamae Vi l l age, 2–10–42 M i yamae, Suginami–ku Tokyo 168, Japan tel. (03) 3247-8838 fax (03) 3247-8839









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GT4123BCKA Даташит, Описание, Даташиты
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE/UNITS
Supply Voltage
±13.5 V
Operating Temperature Range
0°C TA 70°C
Storage Temperature Range
-65°C TS 150°C
Lead Temperature (soldering, 10 seconds)
260°C
Video Input Voltage
±5 V
Control Input Voltage
±5 V
Video Input Differential Voltage
±5 V
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
ELECTRICAL CHARACTERISTICS GT4123B VS = ± 5V, TA = 0°C to 70°C, RL=10k, CL=10pF unless otherwise shown.
PARAMETER
SYMBOL
POWER
SUPPLIES
Supply Voltage
+ Supply Current
- Supply Current
± VS
I+
I-
Common Mode Input Signal VIN CM
Bandwidth
Differential Gain
BW0.05
BW0.1
g
Differential Phase
p
SIGNAL
PATH
PP Signal / RMS Noise
Gain
Delay
Power Supply Rejection
Ratio
Off Isolation & Crosstalk
Output Offset
Offset Difference
Input Resistance
Input Capacitance
Output Resistance
Output Capacitance
Bandwidth
CONTROL
CHANNEL
Delay
Linearity
Control Breakthrough
Crossfade Balance
S/N
AV
td SIG
PSRR
VA or B/VO
VC/VA or B
RIN
CIN
ROUT
COUT
BW0.1
tD CONT
NOTE:
Control Range
VC
1. VA or B = +1 Vp-p, output taken from OUTPUT
2 . VC = +1 Vp-p, output taken from VA or VB
521 - 20 - 01
CONDITIONS
Supply Voltage = ± 5 V
Positve Excursion Limit
Negative Excursion Limit
± 0.05 dB, VIN= 150 mVp-p
± 0.1 dB, VIN= 150 mVp-p
VIN = 40 IRE, 0V CM
at 3.58 MHz and 4.43 MHz
VIN = 40 IRE, 0V CM
at 3.58 MHz and 4.43 MHz
VSIG = 1 Vp-p,
100 kHz (ß = 100%)
ƒ = 1 kHz
ƒ = 10 MHz
ƒSIG = 5 MHz (see note 1)
ƒSIG = 5 MHz (see note 2)
Channel A or Channel B
Channel A - Channel B
ƒ=1 MHz
ƒ=1 MHz
at ± 0.1 dB, VIN = 150 mVp-p
VC = 0 to 1 V ƒC =1 to 10 MHz
VC = 0 to 1 V ƒC = 3.58 MHz
2
MIN
± 4.5
-
-
TYP
±5
15
15
MAX
± 13.2
19.5
19.5
UNITS
V
mA
mA
- - 2.2 V
- - -3.5 V
10 -
- MHz
20 25
- MHz
-
0.01
0.02
%
-
0.01
0.03
deg
60
-0.02
-
70
25
70
80
-
0
100
-
-
-
15
-
-
-
-15
0
70
-0.005
4
-
-
75
85
-
-
-
2.0
-
2.0
20
4
-
-
0
-
-
-
10
-
-
-
-
± 15
±5
-
-
0.50
-
-
10
1.5
-35
+15
+1
dB
dB
ns
dB
dB
dB
dB
mV
mV
k
pF
pF
MHz
ns
%
dB
mV
V









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GT4123BCKA Даташит, Описание, Даташиты
DETAILED DESCRIPTION
The GT4123B is a low power two quadrant video multiplier for
use in a wide range of applications including broadcast and
multimedia.
The internal topology of the device is shown in Figure 1 below.
IN A
IN B
CONTROL
(VC)
-
AMP A
+
XA
VCA
-
AMP B
+
XB
VCB = 0.5 - (VC - 0.5) VCB
-
AMP C
+
+ Σ2
+
+
Σ3
+
+
Σ1 AMP D
+
COMP
OUT
VCA = 0.5 + (VC - 0.5)
0.5V
REF
Fig. 1 Functional Block Diagram of the GT4123B
When V is less than 0.5 V, V reduces and V increases in
C CA CB
proportion so that less of Channel A and more of Channel B
signal is transferred. Similarly, when V is greater than 0.5 V,
C
the opposite occurs.
The SPAN or control range is internally set so that a CONTROL
voltage of 0 V completely cuts off Channel A and fully turns on
Channel B. Similarly, a CONTROL voltage of 1 V will fully turn
on Channel A and completely turn off Channel B.
There is a small dead band at either end of the CONTROL
input. The amount of dead band is about 100 mV. The
CONTROL input can be preceded by an operational amplifier
to overcome the dead band and level shift the control signal
so that other than 0 to 1 V range can be used. The bandwidth
of the CONTROL input is in the order of 20 MHz at ± 0.1 dB to
allow for very fast KEY signals.
The linear portion of the transfer characteristic has a linearity
of better than 1.5%.
The outputs from the multipliers are applied to an analog
summing circuit (1) whose output feeds a wideband amplifier
(Amp D) and presents the mixed signals to the outside world.
The inverting nodes of each input are directly connected to the
output.
Each input is applied to a differential amplifier (AMP A and AMP
B). From the amplifiers, the signals are passed to analog
multiplier circuits (XA and XB) whose outputs are the product
of the input signals and internally generated controlling voltages
V and V .
CA CB
The internal control voltages are derived from a unity gain
differential amplifier (AMP C) whose outputs (true and invert)
are the difference between an internal 0.5 V reference voltage,
and the externally applied CONTROL voltage. In addition, the
internal DC offset of 0.5 V is applied to the controlling voltage
summing circuits 2 and 3.
In this manner, the closed loop gain is nearly unity providing
wideband, stable operation. Because the devices have only 8
pins and require virtually no external parts, the GT4123B lends
itself to high density, multi-function PC board layouts in devices
such as RGB mixers and four layer keyers where close control
law tracking is essential.
Therefore,
VCA = 0.5 V + (VC - 0.5 V)
VCB = 0.5 V - (VC - 0.5 V)
and
When the control input VC equals 0.5 volts, VCA = 0.5 V and
VCB = 0.5 V, and 50% of each input signal passes to the output
of the multiplier stages.
3 521- 20 - 01










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