Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Aug., 2009

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.

2.4W Stereo Audio Power Amplifier (with Gain Setting) & Capfree Headphone Driver

APA2057A

The APA2057A is a monolithic integrated circuit, which

combines a stereo power amplifier and a stereo output

capacitor-less headphone amplifier. The stereo power

amplifier provides 19-steps gain setting for flexible

application. The headphone amplifier is ground-refer-

ence output, and doesn’t need the output capacitors for

DC blocking. The advantages of eliminating the output

capacitor are saving cost, PCB’s space, and component

height.

Both the de-pop circuitry and the thermal shutdown

protection circuitry are integrated in the APA2057A,

which reduces pops and clicks noise during power on/

off and in shutdown mode. Thermal shutdown protects

the chip from being destroyed by over-temperature

failure. To simplify the audio system design in notebook

computer applications, the APA2057A provides the in-

ternal gain setting, and these features can minimize

components and PCB area.

The APA2057A is available in both TSSOP-28P and

TQFN5x5-28 packages. Both packages are character-

ized by space saving and thermal efficiency.

Features

General Description

Applications

– HV

– V

Required

AMP Mode

– THD+N=56dB, at V

– THD+N=64dB, at V

HP Mode

– THD+N=73dB, at HV

P

– THD+N=77dB, at HV

P

– THD+N=85dB, at HV

V

– 1.9W, at V

– 1.2W, at V

–2.4W at V

–1.5W at V

tion

Protection Circuitry

– TSSOP-28P (with Enhanced Thermal Pad)

– TQFN5x5-28 (with Enhanced Thermal Pad)

(RoHS Compliant)