Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 15

Copyright

© 2000

Rev. 1.1, 2000-12-01

Like most analog circuits, component placement,

signal routing, and power/ground isolation can affect

the overall performance of the design.

The layout

should utilize individual ground traces/planes for the

audio amplifier whenever possible.

The audio input

and controller ground, FET ground, and output filter

ground are routed using a “star” connection in the

LXE1710 evaluation board.

See PCB layer views.

The power to the controller IC should be routed using

separate traces that do not carry high current pulses

from the switching circuit. In general, minimizing the

high frequency, high power currents from flowing

through

the

same

copper

as

the

audio

signal

references are recommended.

Signal traces that

could be sensitive to noise should be node to node

connections (no “shared” traces). Stray capacitance at

the controller pins RPWM, EAOUT, EAIN, and FAOUT

can affect the circuit performance and components

associated with these pins should be placed as close

to the controller IC as possible.