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SY88923 Datasheet(PDF) 4 Page - Micrel Semiconductor

Part No. SY88923
Description  2.5Gbps HIGH-SPEED LIMITING POST AMPLIFIER
Download  8 Pages
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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SY88923 Datasheet(HTML) 4 Page - Micrel Semiconductor

   
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4
SY88923
Micrel
LOS Assert and Deassert Levels
vs LOSLVL
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LOSLVL (V)
Deassert
Assert
Output Termination
The SY88923 outputs must be terminated with a 50
load to VCC – 2V (or thevenin equivalent).
Layout and PCB Design
Since the SY88923 is a high-frequency component,
performance can largely be determined by board layout
and design. A common problem with high-gain amplifiers is
feedback from the large swing outputs to the input via power
supply.
The SY88923 ground pin should be connected to the
circuit board ground. Use multiple PCB vias close to the
part to connect to ground. Avoid long, inductive runs which
can degrade performance.
DESIGN PROCEDURE
Figure 3. LOSLVL Circut
NOTE:
Resistor Divider = R2/ (R1 + R2)
R1 + R2
≥ 5kΩ
Figure 2. Differential Input Configuration
DIN+
DIN–
VREF
50
50
0.1
µF
0.1
µF
0.1
µF
VCC
R1
R2
LOSLVL
VREF
PERFORMANCE CURVE
Figure 4. 223-1 Pattern
Figure 5. 223-1 Pattern
Resistor Divider R2 / (R1 + R2)
Deassert
Assert
LOS Assert and Deassert Levels
vs Resistor Divide
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00


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