TDA7808 datasheet(20/39 Pages) STMICROELECTRONICS

20 / 39 page

I2S and TDM bus interface

TDA7808

20/39

DS12230 Rev 4

I2S and TDM bus interface

The audio input port is a three/four-wire synchronous serial interface that can operate only

as Slave. Pins SD13 and SD24 are the serial data inputs. The audio data format accepted

from TDA7808 is the I2S standard.

Input data can also be sent in time division multiplexed (TDM). Pins SCK (bit clock) and WS

(frame select) complete the I2S interface.

Important note on I2S-clock: when I2S-clk is lost during amplifier operations a protection

circuit acts and puts the amplifier in a safe condition: amplifier short circuit protections are

guaranteed, dump protection is guaranteed, signal is muted and outputs bias is under

control.

For avoiding other side effects user should put the amplifier in standby moving STBY pin to

0 V.

7.1

I2S and TDM input data frame format

The audio data word length for each channel may be up to 24 bit. Either for I2S or TDM

mode, the frame for each channel has 32 bit length.

The following table summarizes the frequencies configurations.

Table 7. System input frequencies

Frequency sampling

(Fs)

System clock frequency (fSCK), (MHz)

I2S standard

TDM 4ch

TDM 8ch/8+8ch

44.1 (kHz)

2.8224

5.6448

11.2896

48 (kHz)

3.072

6.144

12.288

96 (kHz

6.144

12.288

24.576

192 (kHz

12.288

24.576

N.A.

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