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參數(shù)資料
| 型號： | GT4124-CDF |
| 英文描述： | Analog Multiplier |
| 中文描述： | 模擬乘法器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 387K |
| 代理商： | GT4124-CDF |
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8
7
5
3
13
2
VIDEO
SOURCE No. 1
1
GB4551
GB4551
0.1
GB4551
8
7
5
3
1
8
7
5
3
1
9
18
13
17
11
9
VIDEO
SOURCE No. 2
No. 1 & No. 2
MIX CONTROL
VIDEO
SOURCE No. 3
(1+2) & No. 3
MIX CONTROL
IN OUT
IN OUT
IN OUT
Back Porch
Pulse
Back Porch
Pulse
Back Porch
Pulse
0.5V
1k
VIDEO 1 & 2
OUTPUT
VIDEO 1, 2 & 3
OUTPUT
0.5V
0.1
0.01
2
0.01
19
14
18
12
11
10
15
+IN B
STRB
S1
S2
+IN A
C-HD
SPAN
Pulse
16
GT4124
8
6
8
6
7
17
Back Porch
19
7
14
12
10
OUT
15
V
REF
R
EXT
CL
REF
+IN B
STRB
S1
S2
+IN A
C-HD
GND
SPAN
Back Porch
Pulse
16
1k
1k
1k
V
REF
-IN A
R
EXT
CL
REF
OUT
-IN B
GND
CL
SIG
CL
SIG
GT4124
-IN A
-IN B
10
10
10
V
C
V
C
Fig. 7 Three Level Mixer Using Two GT4124 Devices
NOTE: 1.
All non marked capacitors connected to GROUND are 470 pF.
2.
All resistors in ohms, all capacitors in
μ
F unless otherwise shown.
3.
For clarity, power supply and offset adjustments are not shown.
THREE LEVEL VIDEO MIXER - GT4124
power and offset circuitry are not included for clarity.
The control channels are identical for both the GT4122 and
GT4124 in terms of SPAN range and frequency response.
Since the STROBE inputs to the GT4124 and the GB4551 are
both active low, these inputs can be paralleled and driven from
any conventional sync separator circuit.
Figure 7 shows an implementation of the GT4124 as a three-level
video mixer incorporating two mixers and three back porch
clamps. In this case, the GB4551 clamps are only used at the
video inputs. Since the GT4124 devices have on-board clamps
themselves, subsequent circuit clamps are not needed.
As with the GT4122 three-level mixer circuit (Figure 5), control,
METHOD:
Connect either the A-IN or B-IN pins to the
Waveform Generator or video source. Terminate
these n p u t s w i t h 5 0
r e s i s t o r s . Connect
the OUTPUT to the Input of the Oscilloscope. Set
the voltage on the CONTROL to 1V in order to
observe the clamping accuracy of the A-INPUT.
Conversely, set the INPUT voltage to 0V for the B-INPUT
measurement. Apply a 1
μ
s, 15kHz negative pulse
triggered by the Waveform Generator (or a burst
pulse from a sync separator if a video signal is
used) to the STROBE INPUT and observe that the
output is clamped to within 1mV of 0V DC.
5) Clamp Operation (No adjustments)
TO
SCOPE
SET TO 1V FOR
A - IN & 0V
FOR B - IN
TESTS
CONTROL
A - IN
B - IN
STROBE
OUT
1V P-P TRIANGLE AT 15 kHz
OR VIDEO SIGNAL
CLAMP
PULSE
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