sta538 STMicroelectronics, sta538 Datasheet - Page 5

• Manufacturer Part Number: sta538
• Description: 2 X 1.3 W Class-d Amplifier With Analog Or Digital Input 2.0 Multichannel Digital Audio Processor With Ffx
• Manufacturer: STMicroelectronics

STA538
1
Figure 1.
VBIAS
VCM
VLO
INR
VHI
INL
PGA
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 FFX
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 I
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.
Block diagram
audio interface
Serial digital
ADC
ADC
OSC
TM
volume
Digital
. In conjunction with a power device, the STA538
2
C interface is disabled). This conversion is done
PLL
PWM out I/F
modulator
FFX
Divider
interface
Power
Power
driver
driver
Control
Introduction
OUT1A
OUT1B
OUT2A
OUT2B
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