Surface USB-C to 3.5mm Audio Adapter Teardown

New Google USB-C to 3.5mm Adapter Teardown(2nd Gen)
4月 23, 2019
Cabledo Qualcomm HiFi DAC Headphone Amplifier
12月 20, 2019

The latest Surface Pro 7 finally adds USB-C port, like Apple and several phone manufacturers before it, Microsoft is now offering a Surface USB-C to 3.5mm Audio Adapter to help ease the transition. The adapter is currently listed on the Microsoft Store, but it's listed as out of stock. We get the sample for the first time.
Today, we gonna teardown it.


The sample we get without retail package, the real photo is following:


Test the adapter on Macbook pro, connect new Macbook pro and 3.5mm plug earphone.


Select" Surface USBC Audio Adapter" device for sound ouput.


We can get some basic information of audio adapter from MacBook hardware-Audio & USB, product serial No. and USB-C Headphone Adapter Manufacturer.


This audio adapter consume very low power when play music, almost same with Google 2nd Gen USB-C to 3.5mm Adapter.


This audio adapter length is about 9cm, This Adapter used the flat cable with black TPE jacket, ABS connector shell material, similar to Apple USB-C 3.5 mm Headphone Jack Adapter material.


At first, we teardown the DC3.5mm female connector.


Next, we teardown the USB Type-C connector, the USB-C circuit board protected by transparent glue, without any metal shell protection.


This audio adapter used 6-core cable. There is an audio CODEC on the circuit board after clear the glue, "CONEXANT CX21988-102"


The Conexant CX21988 is a high-integrated, low-cost crystal-free, USB audio CODEC solution that is optimized for USB Type-C headset applications, sampling rate support 24Bit/96Khz, same series with Google 2nd Gen USB-C to 3.5mm Adapter Audio CODEC. At the same time, our Model No.C3BD3010 audio adpater also used same Conexant Cx21988 audio CODEC.


There are only some resistors and capacitors on the opposite circuit board.


Teardown Summary

1.This adapter used Conexant CX21988 Audio CODEC, HI-RES USB Type-C Compliant, Ultra-low power consumption, maximum battery life.
2.Conexant CX21988/CX21986 CODEC is a very mature USB auido solution, widely applied to all kinds of brand audio dongle, such as Google/Razer/Essential Phone/Hama.

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