STA016T Просмотр технического описания (PDF) - STMicroelectronics
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STA016T Datasheet PDF : 45 Pages
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STA016T
1 OVERVIEW
The device can decode/process data coming from three possible sources, as showed in Figure 2:
s CDDSP serial link: using this input interface, besides MP3 encoded data CD, it’s possible to playback
also standard Audio CD using the available volume and tone equalizer features of the device and
allowing the use of only one D/A converter with no external analog switch.
s SDI input interface: through this input interface it’s possible to decode any MP3 bitstream coming, for
instance, from an external flash memory. This same interface is also used to decode ADPCM streams.
s I2S input interface: this interface can be used both to encode an external audio source (with variable
compression based on 4 different ADPCM algorithm) or to process an external audio source (tuner, for
instance) through the DSP based volume and tone controls:this BYPASS mode can avoid the use of
additional D/A converters or postprocessing units.
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.
Decoded audio data goes through a software volume control and a two-band equalizer blocks before feeding
the output I2S interface. This results in no need for an external audio processor.
Table 1. MPEG Sampling Rates (KHz)
MPEG 1
48
44.1
32
MPEG 2
24
22.05
16
MPEG 2.5
12
11.025
8
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 in-
terfaces 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 connection with an external A/D converter. The currently
used interface is selected via I2C bus.
Also to retrieve encoded data a specific interface is available: the fast 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.
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