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Single-Ended Connection
In a single‐ended connection, SPKN can be left open. Refer to the following diagram for a typical
single‐ended implementation.
Note:
4.7µF < C1 < 47 µF (Depending on speaker characteristics and output power.)
When using a single‐ended connection, bear in mind that:
•
Using a single‐ended connection includes losing output power (‐6dB) as compared to a
differential connection.
•
The connection between the WISMO228 pins and the speaker must be designed to keep the
serial impedance lower than 1.5Ω.
Design Recommendations
General
When both speaker and microphone are exposed to the external environment, it is recommended to
add ESD protection as close to the speaker or microphone as possible, connected between the audio
lines and a good ground.
When using the single‐ended connection of MICP, ensure to have a good ground plane, good
filtering as well as shielding, in order to avoid any disturbance on the audio path.
It is also important to select an appropriate microphone, speaker and filtering components to avoid
TDMA noise.
WA_DEV_W228_PTS_002
Figure 23. Example of a Differential Speaker Connection
Figure 24. Example of a Single-Ended Speaker Connection
Rev 001
Product Technical Specification &
Customer Design Guidelines
SPKP
SPKN
Page 61 of 108
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