Micrel, Inc.
SY88943V
DESIGN PROCEDURE
Output Termination
The SY88943V outputs must be terminated with a 50Ω
load to VCC –2V (or Thevenin equivalent).
Layout and PCB Design
Since the SY88943V is a high-frequency component,
performance can be largely determined by the board layout
and design. A common problem with high-gain amplifiers is
the feedback from the large swing outputs to the input via
the power supply.
The SY88943V 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
VCC
R1
SDLVL
R2
VREF
Figure 2. Differential Input Configuration
Figure 3. SDLVL Circuit
Notes:
SDLVL = VCC -1.32V +
R1 + R2 ≥ 2.6kΩ
R2 × 1.32V
R1 + R2
M9999-082205
hbwhelp@micrel.com or (408) 955-1690
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