FDA803S datasheet(8/15 Pages) STMICROELECTRONICS

8 / 15 page

General information

The FDA803S is a fully digital single channel class-D audio amplifier with feedback before LC filter, designed for

compact and low-cost Application, such as Telematics and eCall. The feedback before LC architecture has been

chosen for allowing smaller components for the demodulator filter, saving cost and space occupation.

The I2S interface is used to provide the audio bit stream, with several sampling frequency from 8 kHz up to

96 kHz. The standard format is used for 4 channels applications, while the TDM allows to work up to 16 channels.

The I2C interface is used to communicate and control the state of the power amplifier, perform the diagnostic and

other features.

The FDA803S embeds an internal 24 bits DAC with 100 dB of resolution. Thanks to interpolation and noise

shaping, the digital signal processing allows to reach up a good audio performance in a small device area. The

internal PLL uses the clock frequency of the bit stream to generate the internal clock for the digital part and PWM

for the outputs.

The innovative self-diagnostic algorithm, available also in play, allows the automatic detection of wrong

load connections or variation of the load and provides this information through the I2C bus to an external

microcontroller.

The communication to the microcontroller is improved by two dedicated CD/Diag. All the useful information, such

as thermal warnings, input and output offset detection, and some more can be selected by the I2C setting and

addressed to the one of the CD/Diag pins. Furthermore, one of these pins could be used to synchronize other

devices on the platform for better EMC management.

FDA803S

General information

DB4683 - Rev 2

page 8/15

FDA803S 数据表(PDF) 8 Page - STMicroelectronics