SY88903VKG(2005) データシートの表示（PDF） - Micrel

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SY88903VKG
(Rev.:2005)

5V/3.3V 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER

Micrel 

Micrel, Inc.

SY88903V

DESIGN PROCEDURE

Output Termination

The SY88903V outputs must be terminated with a 50Ω

load to VCC –2V (or Thevenin equivalent).

Layout and PCB Design

Since the SY88903V 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 SY88903V 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

R1

0.1µF

0.1µF

DIN+

DIN–

LOSLVL

R2

VREF

50Ω

50Ω

VREF

0.1µF

Notes:

R2 × 1.32V

LOSLVS = VCC -1.32V + R1 + R2

R1 + R2 ≥ 2.6kΩ

Figure 2. Differential Input Configuration

Figure 3. LOSLVL Circut

M9999-041505

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

5

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