Yuga CLM920, Руководство пользователя по оборудованию

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PIN Signal I/O Description
1 MIC+ AI Audio input+
3 MIC- AI Audio input-
5 SPK+/REC+ AO Audio
7 SPK-/REC- AO Audio output-
NOTE:

The MIC+/MIC- channel is used as a microphone differential input, and the Mike signal
has the bias voltage needed inside the module without external need. Mike usually uses
electret microphone.

SPK+/SPK- channels are usually used for handles, headphones, or external power
amplifiers. If customers need external audio power amplifiers, they are passed
AT+CSDVC=4 switch to the headphone channel output signal, and then external audio
amplifier amplification signal.

Audio signal is a sensitive signal, it should be far away from the radiation source and
power interface, line as short as possible, and protect sensitive signals.

In order to prevent the TDD noise, the filter capacitor 10pF and 33pF are reserved to
design the audio circuit to remove the RFI signal.
3.11 PCM digital audio
The module provides a set of PCM audio interfaces to support 8 bit A rates, U rates, and
16 bit linear short frame coded lattices. The formula is PCM_SYNC, 8kHZ, PCM_CLK is
2048kHZ.
PIN Signal I/O Description
45 PCM_CLK D0 DO PCM Clock pulse
47 PCM_DOUT DO PCM data output
49 PCM_DIN DI PCM data input
51 PCM_SYNC DO PCM Frame synchronization signal
Features Description
Code format linear
Data bits 16bits
Master-slave mode Master/slave mode