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STA538 Datasheet(PDF) 5 Page - STMicroelectronics

No. de pieza STA538
Descripción Electrónicos  2 x 1.3 W class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
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STA538 Datasheet(HTML) 5 Page - STMicroelectronics

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STA538
Introduction
5/59
1
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
ADC
Serial digital
audio interface
PGA
Digital
volume
OUT1A
OUT1B
OUT2A
OUT2B
VBIAS
INL
VHI
VCM
VLO
INR


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