Audio Interfaces; Rf Interface - Quectel UG96 Manual

4.9. Audio Interfaces

M95 R2.0 provides two analogy input channels, two analogy output channels and one PCM interface,
while UG96/UG95 only provides one PCM audio interface.
The following figure shows the compatible reference design of audio interfaces. For more details, please
refer to document [1], [2] and [3].
PCM_CLK (UG96/UG95/M95 R2.0)
PCM_SYNC (UG96/UG95/M95 R2.0)
PCM_DIN (UG96/UG95/M95 R2.0)
PCM_DOUT (UG96/UG95/M95 R2.0)
GND (UG96/UG95/M95 R2.0)
NOTE
For more details of audio interface compatible design, please refer to document [4].

4.10. RF Interface

RF_ANT is a compatible pin among UG96/UG95 and M95 R2.0. The impedance of the RF interface is
50Ω.
In order to achieve better RF performance, it is recommended to reserve a π-type matching circuit
(R1/C1/C2) and place it close to the antenna. The capacitors (C1/C2) are not mounted and a 0Ω resistor
is mounted on R1 by default. A reference design for RF antenna interface is shown as below.
UG96&UG95&M95 R2.0_Compatible_Design
Module
AGND (M95 R2.0)
MIC1P (M95 R2.0)
MIC1N (M95 R2.0)
SPK1N (M95 R2.0)
SPK1P (M95 R2.0)
MIC2P (M95 R2.0)
MIC2N (M95 R2.0)
LOUDSPKN (M95 R2.0)
LOUDSPKP (M95 R2.0)
Figure 17: Reference Design of Audio Interfaces
HSPA/UMTS/GSM/GPRS Module Series
UG96&UG95&M95 R2.0 Compatible Design
0R
0R
CODEC
0R
0R
0R
GND
0R
AGND
0R
0R
Handset
0R
0R
0R
MIC
0R
Speaker
Audio
Interface
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