STA015 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA015' PDF : 44 Pages View PDF
STA015-STA015B-STA015T
1. OVERVIEW
1.1 - MP3 decoder engine
The MP3 decoder engine is able to decode any
Layer III compliant bitstream: MPEG1, MPEG2
and MPEG2.5 streams are supported. Besides
audio data decoding the MP3 engine also per-
forms ANCILLARY data extraction: these data
can be retrieved via I2C bus by the application
microcontroller in order to implement specific
functions.
Decoded audio data goes through a software vol-
ume control and a two-band equalizer blocks be-
fore feeding the output I2S interface. This results
in no need for an external audio processor.
MP3 bitstream is sent to the decoder using a sim-
ple serial input interface (see pins SDI, SCKR,
BIT_EN and DATA_REQ), supporting input rate
up to 20 Mbit/s. Received data are stored in a
256 bytes long input buffer which provides a
feedback line (see DATA_REQ pin) to the bit-
stream source (tipically an MCU).
1.2 - ADPCM encoder/decoder engine
This device also embeds a multistandard ADPCM
encoder/decoder supporting different sample
rates (from 8 KHz up to 32 KHz) and different
sample sizes (from 8 bit to 32 bits).
During encoding process two different interfaces
can be used to feed data: the serial input inter-
face (same interface used also to feed MP3 bit-
stream) or the ADC input interface, which pro-
vides a seamless connection with an external A/D
converter.
The currently used interface is selected via I2C
bus.
Also to retrieve encoded data two different inter-
faces are available: the I2C bus or the faster
GPSO output interface. GPSO interface is able to
output data with a bitrate up to 5 Mbit/s and its
control pins (GPSO_SCKR, GPSO_DATA and
GPSO_REQ) can be configured in order to easily
fit the target application.
1.3 - BYPASS functional mode
In order to allow using the device to post-process
auxiliary audio sources a special BYPASS mode
is available.
When the device is configured in BYPASS mode
the embedded DSP will process digital audio data
coming through the ADC input interface and will
output the resulting data to the external DAC.
Available processings include volume and a tone
controls.
ABSOLUTE MAXIMUM RATINGS
Symbol
VDD
Vi
VO
Tstg
Toper
Parameter
Power Supply
Voltage on Input pins
Voltage on output pins
Storage Temperature
Operative ambient temp
Value
Unit
-0.3 to 4
V
-0.3 to VDD +0.3
V
-0.3 to VDD +0.3
V
-40 to +150
°C
-20 to +85
°C
THERMAL DATA
Symbol
Rth j-amb
Parameter
Thermal resistance Junction to Ambient
Value
85
Unit
°C/W
4/44
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