sy88923 Micrel Semiconductor, sy88923 Datasheet - Page 4

• Manufacturer Part Number: sy88923
• Description: Sy88923 2.5gb/s High-speed Limiting Post Amplifier
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Output Termination
load to V
Layout and PCB Design
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.
circuit board ground. Use multiple PCB vias close to the
part to connect to ground. Avoid long, inductive runs which
can degrade performance.
Note:
Resistor Divider = R2/ (R1 + R2)
R1 + R2 ≥ 5kΩ
M9999-061907
[e-mail] or [phone]
DESIGN PROCEDURE
The SY88923 outputs must be terminated with a 50Ω
Since the SY88923 is a high-frequency component,
The SY88923 ground pin should be connected to the
CC
– 2V (or thevenin equivalent).
Figure 2. Differential Input Configuration
0.1µF
R1
R2
0.1µF
50Ω
0.1µF
V
CC
Figure 3. LOSLVL Circut
50Ω
V
D
D
LOS
V
REF
IN+
IN–
REF
LVL
4
PERFORMANCE CURVE
100.00
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0.00
LOS Assert and Deassert Levels
LOS Assert and Deassert Levels
Resistor Divider R2 / (R1 + R2)
vs Resistor Divide
Figure 4. 2
Figure 5. 2
vs LOS
LOS
LVL
23
23
LVL
(V)
-1 Pattern
-1 Pattern
Deassert
Assert
Deassert
Assert
SY88923