STA538B datasheet(5/59 Pages) STMICROELECTRONICS

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STA538

Introduction

5/59

Introduction

The STA538 is a digital stereo class-D audio amplifier. It includes an audio DSP, a ST

proprietary high-efficiency class-D driver and CMOS power output stage. It is intended for

high-efficiency digital-to-power-audio conversion for portable applications. The STA538 also

provides output capabilities for FFXTM. In conjunction with a power device, the STA538

provides high-quality digital amplification.

The STA538 contains an on-chip volume/gain control.

The PWM amplifier achieves greater than 90% efficiency for longer battery life for portable

systems.

The innovative class-D modulation, allows the STA538 to work without external LC filters

and without a heatsink.

The STA538 I2CDIS pin disables the audio DSP functions to provide a direct conversion of

the input signal into output power (the I2C interface is disabled). This conversion is done

without the microcontroller.

The STA538 is designed for low-power operation with extremely low-current consumption in

standby mode. It is available in two packages: the TFBGA48 and the VFQFPN52. These are

very thin packages (1.2 mm thick) intended for small portable applications.

Figure 1.

Block diagram

Power

driver

Power

driver

Control

interface

Divider

PLL

OSC

FFX

modulator

PWM out I/F

ADC

Serial digital

audio interface

PGA

Digital

volume

OUT1A

OUT1B

OUT2A

OUT2B

VBIAS

INL

VHI

VCM

VLO

INR

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