Copyright

© ANPEC Electronics Corp.

Rev. A.7 - Mar., 2013

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

2.8W Stereo Class-D Audio Power Amplifier

(with DC Volume Control, AGC Function)

APA2605

The APA2605 is a stereo, high efficiency, filter-free Class-

D audio amplifier available in SOP-18, SSOP-24,

SSOP-24P, and QFN4x4-20A packages.

The APA2605 provides the precise DC volume control,

the gain range is from -80dB (V

(V

s easy to get

the suitable amplifier’s gain with the 64 steps gain setting.

The filter-free architecture eliminates the output filters

compared to the traditional Class-D audio amplifier, and

reduces the external component counts and the compo-

nents high, it could save the PCB space, system cost,

simplifies the design and the power loss at filter.

APA2605 provides an AGC (Non-Clip) function, and this

function can low down the dynamic range for large input

signal. APA2605 can provide from 20dB to -80dB with 64

steps gain decrease for non-clipping function, and this

function can avoid output signal clipping.

The APA2605 also integrates the de-pop circuitry that re-

duces the pops and click noise during power on/off or

shutdown enable process.

The APA2605 has build-in over-current and thermal pro-

tection that prevent the chip being destroyed by short-

circuit or over-temperature situation.

APA2605 is capable of driving 2.8W at 5V into 4

Ω speaker.

The efficiency can archive 85% at R

at V

Features

General Description

Applications

V

– I

by DC Voltage with Hysteresis

– 2.3W at V

– 1.3W at V

Output Power at THD+N=10%

– 2.8W at V

– 1.6W at V

Recovery

SSOP-24P & QFN4x4-20A

(RoHS Compliant)

Simplified Application Circuit

APA2605

Stereo

Speakers

ROUTP

ROUTN

LOUTN

LOUTP

RINN

LINN

Volume

Stereo Input

Signals

DC Volume

Control