UMTS/HSPA Module Series
UG96 Hardware Design
UG96_Hardware_Design 45 / 76
The following figure shows a reference design of PCM interface with external codec IC.
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
CODEC
Module
VDD_EXT
1K
1K
BCLK
LRCLK
DACDAT
ADCDAT
SCL
SDA
B
IA
S
MICBIAS
MIC+
MIC-
SPK+
SPK-
CLK_OUT
MCLK
Rs
NM
Figure 28: Reference Circuit of PCM Master Mode Application with Audio Codec
PCM_IN
PCM_OUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
CODEC
Module
VDD_EXT
1K
1K
BCLK
LRCLK
DACDAT
ADCDAT
SCL
SDA
B
IA
S
MICBIAS
MIC+
MIC-
SPK+
SPK-
CLK_OUT
MCLK
Rs
NM
Figure 29: Reference Circuit of PCM Slave Mode Application with Audio Codec
1. It is recommended to reserve RC (e.g.
R=22Ω, C=22pF) circuit on the PCM lines, especially for
PCM_CLK.
2. UG96 module provides a digital clock output (CLK_OUT) for an external audio codec, the CLK_OUT
function is disabled by default. When CLK_OUT is required, AT command is used to provide the
NOTES