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STA015B Datasheet(PDF) 4 Page - STMicroelectronics |
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STA015B Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 55 page  STA015 STA015B STA015T 4/55 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 I2C bus by the application microcontroller in order 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 I2C bus. Also to retrieve encoded data two different interfaces 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 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 Symbol Parameter Value Unit Rth j-amb Thermal resistance Junction to Ambient 85 °C/W Symbol Parameter Value Unit VDD Power Supply -0.3 to 4 V Vi Voltage on Input pins -0.3 to VDD +0.3 V VO Voltage on output pins -0.3 to VDD +0.3 V Tstg Storage Temperature -40 to +150 °C Toper Operative ambient temp -20 to +85 °C |
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