STA680 datasheet(32/48 Pages) STMICROELECTRONICS

32 / 48 page

Digital I/O and memory interfaces

STA680

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DS5877 Rev 13

Figure 10. Serial audio interface waveforms and timings

5.4.2

Input serial audio interface

The input serial audio interface is used to receive the legacy AM/FM demodulated audio

samples from an external AM/FM Tuner for AAA algorithm purpose.

The input SAI is an I2S interface which accepts 16 bit audio samples in stereo at a 44.1 kS/s

sample rate. For usage with AAA algorithm enabled SW the Input serial audio interface

must be configured as master at 44.1 kS/s (in that case output SAI needs to be configured

as slave).

5.4.3

Audio sample rate converter (ASRC)

The STA680 embeds a stereo channel sample rate converter to be used in combination with

either the output (one single data-line) or the input SAI. The ASRC has a Total Harmonic

Distortion plus Noise (THD+N) level at 1 kHz smaller than -85 dB (0.0056%).

The supported data rates are:



44.1 (± 10 Hz),



45.6 (± 15 Hz)



48 (± 15 Hz)

Table 9. Serial audio interface timing values

Symbol

Parameter

Working rate

Unit

Faws

Word strobe

44.1 ±10 Hz

45.6 ±15 Hz

48 ±15 Hz

kHz

Fabck,16

Bit clock for 16-bit data

32 x Faws

MHz

Fabck,32

Bit clock for 32-bit data

64 x Faws

MHz

Data hold time

Data setup time

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