Quectel EC20 Circuit Diagrams

TITLE
PROJECT
Radom.XIANG
CHECKED BY
Mountain.ZHOU
DRAWN BY
OF
A
6
5
4
32
1
SHEET
A
B
C
D
123456
D
C
B
Quectel Wireless Solutions
SIZE
VER
85
1.0
DATE
2015/3/30
EC20 Reference Design
A2
Audio Design
Audio - Handset Application
Close to
Audio - Earphone Application
earphone interface
Note: It is needed to add audio amplifer when the speaker impedance is less than 32ohm.
Audio Design
CTIA
OMTP
R519/R521
R518/R520 M
M
NM
NM
4
1
3
2
J502
Handset
D504
ESD9X5.0ST5G
D505
C537
33pF
C539
33pF
C540
10pF
C538
10pF
C541
33pF
C536
10pF
C544
10pF
C545
33pF
C546
10pF
C547
33pF
C543
33pF
C542
10pF
C527
10pF
C528
33pF
C529
4.7uF
F501
0R
F502
0R
F504
0R
F503
0R
D506
PESD5V0S1BL
D507
2
IN1P/DMC_DAT
3
IN2P
4
IN2N/JD2
5
DACREF
6
AVDD
7
AGND
10
LOUTR/N
11
CPN2
12
CPP2
13
CPN1
14
CPP1
15
CPVDD
16
CPVPP
18
CPVREF
19
CPVEE
20
HPO_L
21
ADCDAT1
22
DACDAT1
23
LRCK1
26
SCL
27
SDA
28
GPIO1/IRQ1
29
DBVDD
30
DCVDD
31
MICVDD
32
MICBIAS1
8
VREF2
24
BCLK1
1
JD1
9
LOUTL/P
17
HPO_R
25
MCLK
33
DGND
U501
ALC5616
C505
4.7uF
C504
4.7uF
C503
100nF
R501
0R
C502
4.7uF
C501
100nF
C509
2.2uF
C510
100nF
C506
4.7uF
C507
100nF
C508
2.2uF
C515
2.2uF
C516
2.2uF
C511
4.7uF
R502
0R
R507
NM_10K
R508
4.7K
R509
4.7K
C523
4.7uF
C521
2.2uF
C522
2.2uF
R512
0R
R-0805
R503
0R
R504
0R
R505
0R
R506
0R
C512
NM
C513
NM
C514
NM
C524
2.2uF
C525
2.2uF
R510
1K
R511
1.5K
R513
1K
R514
1.5K
C526
10uF
R515
0R
1
2
3
4
5
J501
Earphone
C517
1uF
C518
1uF
C519
1uF
C520
1uF
R516
0R
R517
0R
C530
10pF
C531
33pF
D501
ESD9X5.0ST5G
R519
NM_0R
R518
0R
R520
0R
R521
NM_0R
D502
PESD5V0S1BL
C532
10pF
C533
33pF
D503
PESD5V0S1BL
C534
10pF
C535
33pF
[5]
SPK_P
[5]
MIC_P
[5]
MIC_N
[5]
MIC_N
[5]
SPK_N
VDD_3.0V VDD_EXT
VDD_3.0V
[1]
I2C_SDA
[1]
I2C_SCL
VDD_EXT
VDD_EXT
[1]
PCM_OUT
[1]
PCM_IN
[1]
PCM_CLK
[1]
PCM_SYNC
[5]
MIC+
[5]
MIC-
[5]
SPK_P
[5]
SPK_N
MICBIAS
[5]
MIC_P
[5]
MIC_N
MICBIAS
[5]
MIC+
[5]
MIC-
VDD_EXT
[5]
SPK_R
[5]
SPK_L
[5]
SPK_R
[5]
SPK_L
[5]
MIC_P
[5]
MIC_P
Quectel
Confidential

Quectel EC20 Specifications

General

Brand	Quectel
Model	EC20
Category	PCI Card
Language	English