APA2011 datasheet(20/27 Pages) ANPEC

20 / 27 page

Rev. A.4 - Aug., 2013

www.anpec.com.tw

APA2011/2011A

Output Low-Pass Filter (Cont.)

Application Information (Cont.)

OUTP

OUTN

Ω

µF

µH

µF

Figure 6. LC output filter for 8

Ω speaker

OUTP

OUTN

Ω

2.2

µF

µH

2.2

µF

Figure 7. LC Output Filter for 4

Ω Speaker

Figure 6 and 7’s low pass filter cut-off frequency are 25kHz

C).

(6)

Power-Supply Decoupling Capacitor, C

The APA2011/2011A is a high-performance CMOS audio

amplifier that requires adequate power supply decoupling

to ensure the output total harmonic distortion (THD) is as

low as possible. Power supply decoupling also prevents

the oscillations being caused by long lead length be-

tween the amplifier and the speaker.

The optimum decoupling is achieved by using two differ-

ent types of capacitors that targets on different types of

noise on the power supply leads. For higher frequency

transients, spikes, or digital hash on the line, a good low

equivalent-series-resistance (ESR) ceramic capacitor,

typically 0.1

µF placed as close as possible to the device

VDD pin for works best. For filtering lower frequency noise

signals, a large aluminum electrolytic capacitor of 10

µF

or greater placed near the audio power amplifier is

recommended.

Layout Recommendation

Figure 8. WLCSP1.5x1.5-9 Land Pattern Recommenda-

tion

Figure 9. TDFN3x3-8 Land Pattern Recommendation

0.65mm

1.8mm

Ground Plane for

ThermalPAD

0.35mm

1.2mm

0.275mm

ThermalVia Diamater

12milx5

1. All components should be placed close to the APA2011/

2011A. For example, the input capacitor (C

i) should be

close to APA2011/2011A’s input pins to avoid causing

noise coupling to APA2011/2011A’s high impedance

inputs; the decoupling capacitor (C

S) should be placed

by the APA2011’s power pin to decouple the power rail

noise.

Φ0.275mm

0.5mm

C(lowpass)

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