Micrel, Inc.
SY88913
APPLICATION NOTE
Output Termination
The SY88913 outputs must be terminated with a 50Ω
load to VCC – 2V (or Thevenin equivalent).
Layout and PCB Design
Since the SY88913 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 the
power supply.
The SY88913 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.
VCC
0.1µF
DIN+
R1
0.1µF
DIN–
50Ω
50Ω
0.1µF
VREF
LOSLVL
R2
VREF
Figure 1. Differential Input Configuration
Notes:
Resistor Divider = R2/ (R1 + R2)
R1 + R2 ≥ 5kΩ
Figure 2. LOSLVL Circut
M9999-061907
hbwhelp@micrel.com or (408) 955-1690
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