Loud Speaker (J402); Earphone (J404) - Quectel UC20 User Manual

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UMTS Module
PCM_CLK
PCM_SYNC
PCM_OUT
PCM_IN
I2C_SCL
I2C_SDA

3.3.1. Loud Speaker (J402)

Figure 9 shows the loud speaker circuit with external audio Class-D amplifier. And the name of the J402
pins has been marked on the EVB.
U401
Codec
SPKOUT+
NAU8814
SPKOUT-

3.3.2. Earphone (J404)

An earphone can be used in audio interface J404. Figure 10 shows the circuit of audio interface J404 for
earphone:
UC20_EVB_User_Guide
R
C
1.8V
Figure 8: Audio Codec Circuit
Differential layout
C1
C2
Figure 9: Loud Speaker Circuit
MCLK
BCLK
FS
CODEC
DACIN
NAU8814
ADCOUT
SCLK
SDIN
1nF
Amplifier
FB
circuit
FB
1nF
Confidential / Released
UMTS/HSPA Module Series
UC20 EVB User Guide
MIC_BIAS
MIC+
MIC-
SPKOUT+
SPKOUT-
UC20 EVB
Close to speaker
GND
75pF
ESD
J402
75 pF
ESD
75pF
GND
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