LT1203 데이터 시트보기 (PDF) - Linear Technology
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LT1203 Datasheet PDF : 16 Pages
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LT1203/LT1205
APPLICATI S I FOR ATIO
CMOS MUX Channel-to-Channel Switching Transient
OUTPUT
1V/DIV
INPUT
1V/DIV
LOGIC
CONTROL
RS = 50Ω
NOTE: 50 TIMES LARGER THAN LT1203 TRANSIENT
LT1203 Switching Inputs
LT1203/05 • AI02
LOGIC
(PIN 5)
OUTPUT
(PIN 7)
only 10mVP-P. A photo of the switching transients from a
CMOS MUX shows glitches to be 50 times larger than on
the LT1203. Also shown is the output of the LT1203
switching on and off a 2MHz sinewave cleanly and without
abnormalities.
Pixel Switching
The multiplexers are fabricated on LTC's Complementary
Bipolar Process to attain fast switching speed, high band-
width, and a wide supply voltage range compatible with
traditional video systems. Channel-to-channel switching
time and Enable time are both 25ns, therefore delay is the
same when switching between channels or between ICs.
To demonstrate the switching speed of the LT1203/LT1205
the RGB MUX of Figure 1 is used to switch RGB Worksta-
tion inputs with a 22ns pixel width. Figure 2a is a photo
showing the Workstation output and RGB MUX output.
The slight rise time degradation at the RGB MUX output is
due to the bandwidth of the LT1260 current feedback
amplifier used to drive the 75Ω cable. In Figure 2b, the
LT1203 switches to an input at zero at the end of the first
pixel and removes the following pixels.
CHANNEL 1 = 0V
CHANNEL 2 = 2MHz SINEWAVE
LT1203/05 • AI03
C4
4.7µF
+
J1
RED 1
R1
75Ω
C3
4.7µF
J2
RED 2
R2
75Ω
J3
GREEN 1
R3
J4
75Ω GREEN 2
R4
75Ω
J5
BLUE 1
R5
J6
75Ω
BLUE 2
R6
75Ω
1
+1
2
3
+1
4
LT1205
5
+1
6
7
+1
8
1
+1
2
LT1203
3
+1
4
C1
0.1µF
16
15
14
13
12
11
10
9
C2
0.1µF
8
7
6
5
J8
ENABLE
J7
LOGIC
R11 R10
1.5k 1.5k
1
2
R7*
10k
R12
1.5k
3
4
5
R8*
R13 6
10k
1.5k
7
R14
1.5k
8
R15
1.5k
R9*
10k
*OPTIONAL
–
R
+
–
G
+
+
B
–
LT1260
Figure 1. RGB MUX
V+ V – GND
16
R16
15
75Ω
J9
RED
14
13
R17
12
75Ω
J10
GREEN
11
R18
10
75Ω
J11
BLUE
9
LT1203/05 • F01
8
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