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3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
Figure 3.13.3 Timing diagram of Bluetooth application
I2S/EIAJ interface is designed to transmit high quality audio data. Figure 3.13.4 and Figure 3.13.5 illustrate
the timing diagram of the two types of interfaces. I2S/EIAJ can support 32 kHz, 44.1 kHz, and 48 kHz
sampling rate audio signals. The clock frequency of I2S/EIAJ can be 32
Ý
(sampling frequency), or
64
Ý
(sampling frequency). For example, to transmit a 44.1 kHz CD-quality music, the clock frequency should
be 32
Ý
44.1 kHz = 1.4112 MHz or 64
Ý
44.1 kHz = 2.8224 MHz.
I2S/EIAJ interface is not only used for Bluetooth module, but also for external DAC components. Audio data
can easily be sent to the external DAC through the I2S/EIAJ interface. In this document, the I2S/EIAJ interface
is referred to as EDI (External DAC Interface).
Figure 3.13.4 Block diagram of digital circuit of audio front end
Figure 3.13.5 Block diagram of digital circuit of audio front end
