Quectel EC25 series Reference Design Download Page 10

Page: 10 / 15

Yeoman CHEN

CHECKED BY

Eden LIU

DRAWN BY

2016/11/11

Quectel Wireless Solutions

PROJECT

SIZE

SHEET

DATE

OF 10

VER

EC25

TITLE

CTIA OMTP

R519/R521
R518/R520

Audio Design

Audio - Earphone Application

Audio - Handset Application

To make sure the function works normally, please follow ALC5616 power on and off sequence.

Note:

For more details please refer to ALC5616 datasheet.

Close to earphone interface.

1. The analog output only drives earphone and headset. For larger power loads such as speakers, the design needs to incease the audio power amplifier.
2. The maximum capacitive loading for SPK is 330 pF and the maximum capacitive loading for MIC is 250 pF.

Notes:

Reference Design

4
1
3
2

J502

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

F502

F504

F503

D506

PESD5V0S1BL

D507

2 IN1P/DMC_DAT

3 IN2P

4 IN2N/JD2

DACREF

AVDD

AGND

LOUTR/N

CPN2

CPP2

CPN1

CPP1

CPVDD

CPVPP

CPVREF

CPVEE

HPO_L

21 ADCDAT1

22 DACDAT1

23 LRCK1

SCL

SDA

28 GPIO1/IRQ1

DBVDD

DCVDD

MICVDD

32 MICBIAS1

VREF2

24 BCLK1

1 JD1

LOUTL/P

HPO_R

25 MCLK

DGND

U501

ALC5616

C505

4.7uF

C504

4.7uF

C503

100nF

R501

C501

4.7uF

C502

100nF

C509

2.2uF

C510

100nF

C506

4.7uF

C507

100nF

C508

2.2uF

C515 2.2uF

C516 2.2uF

C511 4.7uF

R503

R508

NM_10K

R510

4.7K

R509

4.7K

C523

4.7uF

C521

2.2uF

C522

2.2uF

R517

R-0805

R504

R505

R506

R507

C512

C513

C514

C524 2.2uF

C525

2.2uF

R516

R514

1.5K

R513

R515

1.5K

C526

10uF

R502

4
5

J501

C517

1uF

C518

1uF

C519

1uF

C520

1uF

R511

R512

C530

10pF

C531

33pF

D501

ESD9X5.0ST5G

R519

NM_0R

R518

R520

R521

NM_0R

D502

PESD5V0S1BL

C532

10pF

C533

33pF

D503

PESD5V0S1BL

C534

10pF

C535

33pF

R522

R523

C549

NM_33pF

C548

NM_33pF

[5] SPK_P

[5] MIC_P

[5] MIC_N

[5] SPK_N

VDD_3.3V

VDD_1V8

VDD_3.3V

[1]

I2C_SDA

[1]

I2C_SCL

VDD_1V8

[1] CODEC_PCM_OUT

[1] CODEC_PCM_IN

[1] CODEC_PCM_CLK

[1] CODEC_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_1V8

[5]

SPK_R

[5]

SPK_L

[5] SPK_R

[5] SPK_L

[5] MIC_P

[5]

MIC_P

Quectel

Confidential

Summary of Contents for EC25 series

Page 1: ...EC25 Reference Design LTE Module Series Rev EC25_Reference_Design_Rev D Date 2016 11 11 www quectel com...

Page 2: ...TION PROVIDED IS BASED UPON CUSTOMERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTA...

Page 3: ...design in Sheet 1 2 Added power supply for codec in Sheet 3 3 Added note for UART Translator Transistor Solution in Sheet 4 4 Changed some DGND to AGND in audio design in Sheet 5 C 2016 10 14 Eden LI...

Page 4: ...Module Series EC25 Reference Design EC25_Reference_Design Confidential Released 3 4 Contents About the Document 2 Contents 3 1 Reference Design 4 1 1 Introduction 4 1 2 Schematics 4 Quectel Confident...

Page 5: ...sign Confidential Released 4 4 1 Reference Design 1 1 Introduction This document provides the reference design for Quectel EC25 module 1 2 Schematics The schematics illustrated in the following pages...

Page 6: ...37 RESERVED 38 RESERVED 39 RESERVED 40 RESERVED 41 I2C_SCL 42 I2C_SDA 43 RESERVED 44 ADC1 45 ADC0 46 GND 47 ANT_GNSS 48 GND 49 ANT_MAIN 50 GND 51 GND 52 GND 53 GND 54 GND 55 RESERVED 56 GND 57 VBAT_RF...

Page 7: ...eep WAKEUP_IN_MODULE at low level before module starts up successfully Reference Design Quectel_EC25 EC21_AT_Commands_Manual Quectel_EC25_Hardware_Design and VBUS_CTRL High level Q207 is turned on AP_...

Page 8: ...ly must be able to provide sufficient current up to 2A or more 3 The recommended operating voltage of VBAT is 3 3V 4 3V Supply Power for PCM Codec Reference Design Note 2 2 RC circuit which is assembl...

Page 9: ...low level and high level detections For more details please refer to 1 The decouple capacitor of USIM_VDD should be less than 1uF and must be near to USIM socket Notes Note It is recommended to use a...

Page 10: ...D 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 V...

Page 11: ...unction is ON by default If diversity antenna is not used there is a need to use AT command to turn off diversity reception 5 ESD protection devices should be added to the GNSS antenna interface and t...

Page 12: ...ld keep a distance of 3 times of its trace width from other signal lines 1 MDC 2 RSTN 3 LX 4 VDD33 5 INT 6 XTLO 7 XTLI 8 AVDDL 9 RBIAS 10 VDDH_REG 11 TRXP0 12 TRXN0 13 AVDDL 14 TRXP1 15 TRXN1 16 AVDD3...

Page 13: ...round transformers is prohibited for better ESD protection performance 5 For better EMI suppression performance do not route in top layer weak pull up down configuration signal 0 0 0 0 0 0 0 0 0 0 0 0...

Page 14: ...0K 1 GND 2 RESERVED 3 RESERVED 4 DBG_TXD 5 LTE_UART_TXD 6 LTE_UART_RXD 7 BT_UART_RTS 8 BT_UART_CTS 9 WLAN_EN 10 BT_EN 11 VIO 12 GND 20 GND 21 VDD_3V3 22 SDIO_D3 23 SDIO_D2 24 SDIO_D1 25 SDIO_D0 26 SDI...

Page 15: ...used to upgrade firmware Junction capacitance of ESD component on USB data lines might influence the signal please pay attention to it Typically the capacitance should be less than 1pF Note When USB_...

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