Quectel Wireless Solutions Company Limited 201404UC15M User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 26 / 40
The following figure shows the reference design of PCM interface with external codec IC.
Figure 11: Reference Circuit of PCM Application with Audio Codec
It is recommended to reserve RC (R=22Ω, C=22pF) circuit on the PCM lines, especially for PCM_CLK.
3.7.2. Analog Audio Interface
UC15 Mini PCIe Telematics version supports one differential input and output analog audio interface, and
this interface works as the default audio channel. The following tables show the pin definition and
characteristics of analog audio interface.
Table 11: Pin Definition of Analog Audio Interface
Pin No.
Pin Name
I/O
Description
1
MICP
AI
Audio positive input.
3
MICN
AI
Audio negative input.
5
SPKP
AO
Audio positive output.
7
SPKN
AO
Audio negative output.
NOTE