September 2007

Rev 1

1/5

AN2621

Application note

TS488/9 low power stereo headphone amplifier

evaluation board user guidelines

Introduction

This application note concerns the evaluation board DEMOTS488/9, designed to evaluate

the TS488 or TS489 pop-free 120mW stereo headphone amplifier.

In this document, you will find:

About the TS488, TS489

The TS488/9 is an enhancement of TS486/487 that eliminates pop & click noise. It is a dual

audio power amplifier capable of driving, in single-ended mode, either a 16

Ωor a 32Ωstereo

headset.

It delivers up to 31mW per channel (into 16

Ω loads) of continuous average power with 0.1%

THD+N in the audio bandwidth from a 2.5V power supply.

An externally-controlled standby mode reduces the supply current to 10nA (typical). The

TS488/9 is unity gain stable and is configured by external gain-setting resistors.

Key features of the TS488/9 include:

– 120mW @5V, into 16

Ω with 0.1% THD+N max (1kHz)

– 55mW @3.3V, into 16

Ω with 0.1% THD+N max (1kHz)

For complete information about the TS488/9, refer to the datasheet.

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