AW8110CSR datasheet(13/14 Pages) AWINIC

13 / 14 page

AW8110 Datasheet

June 2010 V1.3

Page 13 of 14

Applications Information

Supply Decoupling Capacitor

The AW8110 is a high-performance class-D audio

amplifier that requires adequate power supply

decoupling to ensure the efficiency is high and

Total Harmonic Distortion (THD) is low. For higher

frequency transients, a good low Equiva-

lent-Series-Resistance (ESR) ceramic capacitor,

typically 1μF, placed as close as possible to the

device VDD pin works best. For filtering low-

er-frequency noise signals, a 10 μF or greater

capacitor placed near the audio power amplifier

would also help.

Input Resistors

The input resistors set the gain of the amplifier

according to equation as follow.

Rin

kΩ

150

Gain

⎟

⎠

⎞

⎜

⎝

⎛

The resistor matching is very important. CMRR,

PSRR and THD diminish if resistor mismatch oc-

curs. Therefore, it is recommended use 1% to-

lerance resistors or better to keep the perfor-

mance optimized. Place the input resistors very

close to the AW8110 to limit noise injection on the

high- impedance nodes.

Input Capacitor

The input coupling capacitor blocks the DC vol-

tage at the amplifier input terminal. The input ca-

pacitors and input resistors form a high-pass filter

with the corner frequency, fc.

RinCin

Setting the high-pass filter point high can block

the 217Hz GSM noise coupled to inputs. Better

matching of the input capacitors improves per-

formance of the circuit and also help to suppress

pop-click noise.

Ferrite Chip Bead and Capacitor

The AW8110 passed FCC and CE radiated emis-

sions with no ferrite chip beads and capacitors

with speaker trace wires 24 inch. Use ferrite chip

beads and capacitors if device near the EMI sen-

sitive circuits and/or there are long leads from

amplifier to speaker, placed as close as possible

to the output pin.

Figure 7 Ferrite Chip Bead and capacitor

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