New Google USB-C to 3.5mm Adapter Teardown(2nd Gen)

Apple USB-C Digital to 3.5 mm Headphone Adapter Teardown
November 3, 2018
 

Last year, Google offered a USB-C to 3.5mm dongle for the price of $20 and then dropped it to $9. The Pixel 2 did come with one audio dongle in the box. The new USB-C to 3.5mm dongle is supposed to have 38% more playback time and 53% improvement on plug-in latency than previously available Pixel 2 headphone adapter. It’s also a tiny bit shorter than last year’s model.

Today, we gonna tear down it.

 
 

The new USB-C headphone dongle is a bit shorter than the last generation because of type c circuit board update, the same appearance with 1st generation.

 
 
 

This new headphone adapter can be connected to MacBook as an external sound card.

 
 
 

We can get some basic information of audio dongle from MacBook hardware>USB, product serial No. and USB-C Headphone Adapter Manufacturer, at the same time, the new audio dongle current required is much lower than 1st Gen USB-C headphone adapter.

Next, we will test the real power consumption when play the music on MacBook Pro.

 
 
 

The new headphone adapter power consumption much lower in practical testing.

 
 

Tear down the DC3.5mm female connector.

 
 

This new dongle used 6 core cable

 
 

Next, we tear down the USB Type-C connector, the USB-C circuit board protected by double-side metal protective shell with laser welding workmanship.

 
 

Remove the covered metal shell, and clear the glue.

 
 

There are some resistances and capacitances on the connector board, this circuit board produced on WK44,2018.

 
 

There is only one chip on the back site of type c circuit board, maked 21986-10 13062.1 1835W, the cx21986 is a custom USB-C Audio Codec Made for Google by American Synaptics.


Synaptics Codec Series Specification

Codec Model CX20988 CX21988 CX21986
Sampling Rate 24Bit/48Khz 24Bit/96Khz 24Bit/96Khz
HP-SNR 104 104 104
THD -86db -86db -86db
Standby Power Consumption 9.5mA 1.5mA 1.5mA
Play Music Power Consumption 20.5mA 15.3mA 15.3mA
 
 

Teardown Summary

1.Ultra-low power consumption, maximum battery life, much better than 1st Gen USB-C to digital 3.5mm headphone adapter Realtek solution.
2.1st Gen headphone adapter used Realtek ALC4021 Codec and ALC5663 headphone amplifier, the new headphone adapter used highly integrated single chip Synaptics USB-C audio codec CX21986, optimized cost,the most cost effective solution in the market today.

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