4

SY88923

Micrel, Inc.

M9999-060506

hbwhelp@micrel.com or (408) 955-1690

LOS Assert and Deassert Levels

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Deassert

Assert

Output Termination

The SY88923 outputs must be terminated with a 50

Ω

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

50

Ω

50

Ω

0.1

µF

0.1

µF

0.1

µF

R1

R2

PERFORMANCE CURVE

Resistor Divider R2 / (R1 + R2)

Deassert

Assert

LOS Assert and Deassert Levels

vs Resistor Divide

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50.00

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100.00