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TDA7808 bảng dữ liệu(PDF) 20 Page - STMicroelectronics

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I2S and TDM bus interface
TDA7808
20/39
DS12230 Rev 4
7
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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