Users Manual Part 2

SIM8260A_Hardware Design_V1.05
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Figure 31: Audio codec reference circuit
The PCM interface is multiplexing with I2S interface. The default audio interface of the module is I2S.
Table 36: The PCM interface is multiplexing with I2S interface
Pin name
Pin no.
Electrical
description
Description
Comment
I2S_DOUT/
PCM_DOUT
N1
DO
P3
I2S/PCM data output
Default is I2S
interface,
can be configured as
PCM interface by
software,
If unused, please
keep open
I2S_DIN/
PCM_DIN
R1
DI
P3
I2S/PCM data input
I2S_CLK/
PCM_CLK
P3
DO
P3
I2S/PCM clock output
I2S_WS/
PCM_SYNC
T3
DIO
P3
I2S word selection/
PCM synchronization signal
I2S_MCLK
L1
DO
P3
I2S master clock output

For more details about audio function, please refer to
Document [19]
in the appendix.

Codec ALC5616 supports 5-wire I2S by default. Software can configure the internal registers of
ACL5616 to configure 4-wire I2S (without I2S_MCLK signal) or 5-wire I2S (with I2S_MCLK signal)
interface.
Table 37: Recommended audio list
Name
Manufacturer
Model
ALC5616
REALTEK
ALC5616-CGT
Audio layout guidelines：
Analog input
 0.2mm trace widths; 0.2mm spacing between traces.
 Pseudo differential route for MIC.
 Isolate from noise sources, such as antenna, RF signals, SMPS, clocks, and other high speeding
signals.
Analog output
 Isolate from noise sources such as antenna, RF signals, SMPS, clocks, and other digital signals with
fast transients.
 Speaker output signal – route as differential pair with 0.5mm trace widths.
NOTE