sta015t-013tr STMicroelectronics, sta015t-013tr Datasheet - Page 4

• Manufacturer Part Number: sta015t-013tr
• Description: Mpeg 2.5 Layer Iii Audio Decoder With Adpcm Capability
• Manufacturer: STMicroelectronics

STA015 STA015B STA015T
1.0 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 performs ANCIL-
LARY data extraction: these data can be retrieved via I
to implement specific functions.
Decoded audio data goes through a software volume control and a two-band equalizer blocks before feed-
ing the output I2S interface. This results in no need for an external audio processor.
MP3 bitstream is sent to the decoder using a simple 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 bitstream 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 interface (same
interface used also to feed MP3 bitstream) or the ADC input interface, which provides a seamless con-
nection with an external A/D converter. The currently used interface is selected via I
Also to retrieve encoded data two different interfaces are available: the I
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 applica-
tion.
1.3 BYPASS functional mode
In order to allow using the device to post-process auxiliary audio sources a special BYPASS mode is avail-
able. 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 ontrols.
THERMAL DATA
ABSOLUTE MAXIMUM RATINGS
4/55
Rth j-amb
Symbol
Symbol
T
V
T
oper
V
Vi
stg
DD
O
Thermal resistance Junction to Ambient
Power Supply
Voltage on Input pins
Voltage on output pins
Storage Temperature
Operative ambient temp
Parameter
Parameter
2
C bus by the application microcontroller in order
-0.3 to V
-0.3 to V
2
C bus or the faster GPSO output
-40 to +150
Value
-20 to +85
-0.3 to 4
85
Value
DD
DD
+0.3
+0.3
2
C bus.
°C/W
Unit
Unit
°C
°C
V
V
V