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PDF LT1675 Data sheet ( Hoja de datos )
| Número de pieza | LT1675 | |
| Descripción | 250MHz/ Triple and Single RGB Multiplexer with Current Feedback Amplifiers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1675 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LT1675/LT1675-1
250MHz, Triple and Single
RGB Multiplexer with Amplifiers
FEATURES
■ 100MHz Pixel Switching
■ – 3dB Bandwidth: 250MHz
■ Channel Switching Time: 2.5ns
■ Expandable to Larger Arrays
■ Drives Cables Directly
■ High Slew Rate: 1100V/µs
■ Low Switching Transient: 50mV
■ Shutdown Supply Current: 100µA
■ Output Short-Circuit Protected
■ Available in Small 16-Pin SSOP Package
U
APPLICATIO S
■ RGB Switching
■ Workstation Graphics
■ Pixel Switching
■ Coaxial Cable Drivers
■ High Speed Signal Processing
DESCRIPTIO
The LT®1675 is a high speed RGB multiplexer designed
for pixel switching and fast workstation graphics.
Included on chip are three SPDT switches and three
current feedback amplifiers. The current feedback ampli-
fiers drive double-terminated 50Ω or 75Ω cables and are
configured for a fixed gain of 2, eliminating six external
gain setting resistors. The SPDT switches are designed to
be break-before-make to minimize unwanted signals cou-
pling to the input.
The LT1675-1 is a single version with two inputs, a single
output and is ideal for a single channel application such as
video sync.
The key to the LT1675 fast switching speed is Linear
Technology’s proprietary high speed bipolar process. This
MUX can toggle between sources in excess of 100MHz,
has a slew rate over 1000V/µs and has a –3dB bandwidth
of 250MHz. Power supply requirements are ±4V to ±6V
and power dissipation is only 300mW on ±5V, or 100mW
for the LT1675-1. The expandable feature uses the disable
pin to reduce the power dissipation to near 0mW in the off
parts.
Unlike competitive solutions that are in bulky high pin
count packages, the LT1675 is in a 16-lead narrow body
SSOP. This small footprint, the size of an SO-8, results in
a very clean high performance solution. The LT1675-1 is
available in the tiny MSOP and the SO-8.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
High Speed RGB MUX
RED 1
GREEN 1
BLUE 1
RED 2
GREEN 2
BLUE 2
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
+1
+1
+1
+1
+1
+1
LT1675
V+
75Ω CABLE
+2 VOUT RED
75Ω
75Ω CABLE
+2 VOUT GREEN
75Ω
75Ω CABLE
+2 VOUT BLUE
75Ω
V–
SELECT RGB1/RGB2
ENABLE
1675 TA01
Clocking Between 2 DC Levels at 100MHz
3V
LOGIC
INPUT
PIN 10
0V
1V
RED
OUT
0V
1V/DIV
500mV/DIV
RED INPUT 1 = 0VDC, RED INPUT 2 = 1VDC
MEASURED BETWEEN 50Ω BACK TERMINATION AND 50Ω LOAD
1675 TA02
16751fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1675/LT1675-1
Gain and Phase vs
Frequency
5
0
4 –20
PHASE
3 –40
2 –60
1
GAIN
0
–80
–100
–1 –120
–2 –140
–3
CL = 0pF
–4 RL = 150Ω
–5
100k 1M 10M 100M
FREQUENCY (Hz)
–160
–180
–200
1G
1675 G01
Frequency Response with
Capacitive Loads
6
RL = 150Ω
5
4
CL = 10pF
3 CL = 5pF
2 CL = 3pF
1
0 CL = 0pF
–1
–2
–3
–4
100k
1M 10M 100M
FREQUENCY (Hz)
1G
1675 G02
– 3dB Bandwidth vs
Supply Voltage
300
280 RL = 150Ω
260
240
220
200
180
160
140
120
100
2
34 5
SUPPLY VOLTAGE (±V)
6
1675 G04
Crosstalk Rejection vs Frequency
–30
–40 RS = 75Ω
RL = 150Ω
–50 R1 DRIVEN
R2 SELECTED
–60
–70
–80
–90
–100
–110
–120
–130
100k
1M 10M 100M
FREQUENCY (Hz)
1G
1675 G05
Crosstalk Rejection vs Frequency
(Disabled)
–10
–20 RS = 75Ω
RL = 150Ω
–30
–40
–50
–60
–70
–80
–90
–100
–110
100k
1M 10M 100M
FREQUENCY (Hz)
1G
1675 G06
Power Supply Rejection Ratio
vs Frequency
70
60
VS = ±5V
TA = 25°C
50 RL = 150Ω
40
+PSRR
30
–PSRR
20
10
0
–10
–20
–30
100k
1M 10M 100M
FREQUENCY (Hz)
1G
1675 G07
Gain vs Frequency
6.5
RL = 100Ω
6.4
6.3
6.2
6.1
6.0
5.9
RG
5.8
5.7 B
5.6
5.5
10k
100k 1M 10M
FREQUENCY (Hz)
100M
1675 G03
Crosstalk Rejection vs Frequency
20
10
RS = 75Ω
RL = 150Ω
0 G1 DRIVEN
R1 SELECTED
–10
–20
–30
–40
–50
–60
–70
–80
100k
1M 10M 100M
FREQUENCY (Hz)
1G
1675 G23
Undistorted Output Swing
vs Frequency
8
VS = ±5V
RL = 150Ω
7
6
5
4
3
2
1M
10M 100M
FREQUENCY (Hz)
1G
1675 G08
16751fb
5
5 Page 
APPLICATIONS INFORMATION
750Ω
n...
OFF
75Ω
750Ω
750Ω
750Ω
OFF
750Ω
ON
750Ω
⇒75Ω 75Ω
1575 R2
n – 1 75Ω
R1
75Ω CABLE
n = NUMBER OF LT1675s
IN PARALLEL
75Ω
1675 F05
Figure 5. Off Channels Load the Cable Termination
with 1575Ω Each
LT1675/LT1675-1
R1
AV = 2
75Ω
R2
LT1675 #1
ENABLE
R3
AV = +2
75Ω RED
OUT
75Ω
R4
LT1675 #2
ENABLE
CHIP
SELECT
74HC04
1675 F06
Figure 6. Two LT1675s Build a 4-Input RGB Router
1V
RED 1
INPUT
0V
1V
RED
OUTPUT
0V
500mV/DIV
500mV/DIV
CHIP SELECT = 0V, IC #2 DISABLED
1675 F07
Figure 7. 4-Input Router Response
CHIP 5V
SELECT
0V
RED 0V
OUTPUT
5V/DIV
1V/DIV
RED 1 INPUT = 0V
RED 3 INPUT = UNCORRELATED SINEWAVE
1675 F08
Figure 8. 4-Input Router Toggling
16751fb
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1675.PDF ] | |
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