SY88923 Просмотр технического описания (PDF) - Micrel
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SY88923 Datasheet PDF : 6 Pages
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Micrel, Inc.
SY88923
DESIGN PROCEDURE
Output Termination
The SY88923 outputs must be terminated with a 50Ω
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.
0.1µF
0.1µF
DIN+
DIN–
50Ω
0.1µF
50Ω
VREF
Figure 2. Differential Input Configuration
VCC
R1
R2
LOSLVL
VREF
PERFORMANCE CURVE
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
LOS Assert and Deassert Levels
vs LOSLVL
LOSLVL (V)
Figure 4. 223-1 Pattern
Deassert
Assert
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
LOS Assert and Deassert Levels
vs Resistor Divide
Deassert
Assert
Resistor Divider R2 / (R1 + R2)
Figure 5. 223-1 Pattern
Note:
Resistor Divider = R2/ (R1 + R2)
R1 + R2 ≥ 5kΩ
Figure 3. LOSLVL Circut
M9999-061907
hbwhelp@micrel.com or (408) 955-1690
4
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