The latest trend in wireless headsets are True Wireless Stereo systems (TWS) consisting of two independent earbud units that are charged in a charging case. These headsets are typically connected through Bluetooth to an audio source while some contain additional memory for to store music. TWS headsets often contains an ANC (Active Noise Cancellation) CODEC (DA7401) to eliminate unwanted background noise in your environment whether on a call or listening to music. At the same time minimizing disturbances in the transmitted audio stream picked-up e.g. during voice calls is key feature which can be supported by DA7403.

The implementation of a voice pickup coil, similar to a bone conduction microphone, improve filtering of unwanted noise and limit the detection of voice spoken by the individual wearing the earbuds only.

The cradle typically supports USB (type-C) for charging of its own battery through a switching charger and a boost converter to generate the charging voltage of the connected earbuds.

Dialog’s TWS cradle optimized DA9168 does all of this in a single-chip. The earbud can be charged and internally powered by DA9098, another single-chip solution comprised of a charger a 4-channel SIMO (Single Input Multiple Output) buck converter, 4 LDOs, 3-LED driver channels and more.

Features such as a single wire interface for communication to the individual earbuds can be added through our GreenPAKs.