STA1295 datasheet(17/109 Pages) STMICROELECTRONICS

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DS12586 Rev 5

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STA1295, STA1275

System description

106

2.11.1

Audio interfaces

A complete set of audio interfaces is provided, in order to simplify integration with amplifiers,

and input sources. Each interface can be routed to the sound subsystem. A complete list of

audio interfaces is provided below:

•

1x AUX ADC:

–

18 bit Delta Sigma ADCs with 98 dB A-weighted

–

83 dB THD internally

–

multiplexed between AUX line and tuner line

–

ADC inputs are single ended 3.3 V

•

2x Voice ADC (for MIC-IN and TEL-IN) for high quality hands-free at 8/16/24 kHz:

–

18 bit Delta Sigma ADCs with 98 dB A-weighted

–

83 dB THD

–

Both voice and TEL-IN lines are differential inputs

•

3x Stereo DAC delivering:

–

103 dB A-weighted

–

90 dB THD

–

DAC outputs are single ended 3.3 V

•

3x i2s IN

•

3x i2s OUT

•

1x MSP IN/OUT, TDM capable

•

1x SPDIF IN for CD/CDROM input with hardware block decoder for CDROM error

correction

2.11.2

Routing and sample rate converter

Each audio interface can be routed in both directions (IN/OUT) through sample rate

converters, which allow normalizing the sampling rate to the sound processing engine. The

audio routing infrastructure is designed to deliver high quality sample rate conversion on

multiple channels, allowing simultaneous audio streams, such as BlueTooth Hands Free

and audio media playback, to be handled without CPU load.

In order to generate multiple sampling rate audio frequencies, a dedicated fractional PLL is

also provided. This PLL also allows an efficient implementation of iPOD playback, by

dynamically adjusting the reconstructed audio sampling rate without CPU overload.

2.11.3

Sound DSP

STA1275 and STA1295 are equipped with three (3) 150 MIPS 24-bit fixed point Harvard

architecture DSPs (for a total of 450 MIPS) dedicated to sound processing, fully integrated

with the sound subsystem with a specific isochronous bus. DSPs are provided with an

integrated sound processing library implementing effects like gain, balancing and equalizer.

•

STA1275 and STA1295 are equipped with 2 DSPs configured as:

–

6 k x 32 bit program PRAM

–

4 k x 24 bit data XRAM

–

4 k x 24 bit data YRAM

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