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WM8281ECS/R Datenblatt(PDF) 376 Page - Cirrus Logic

Teilenummer WM8281ECS/R
Bauteilbeschribung  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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Hersteller  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8281ECS/R Datenblatt(HTML) 376 Page - Cirrus Logic

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WM8281
376
Rev 4.0
Typical headphone and earpiece connections are illustrated in Figure 87.
Earpiece
The HPOUT1FB1 or HPOUT1FB2 pin is
selected by the ACCDET_SRC register bit.
WM8281
HPOUT1L
HPOUT1R
HPOUT1FB1
HPOUT2L
HPOUT2R
HPOUT2FB
HPOUT1FB2
HPOUT3L
HPOUT3R
HPOUT3FB
Each headphone output can support stereo (single-
ended) or mono (differential) output. The illustration
shows the configuration for a typical application.
Figure 87 Headphone and Earpiece Connection
It is common for ESD diodes to be wired to pins that link to external connectors. This provides
protection from potentially harmful ESD effects. In a typical application, ESD diodes would be
recommended for the headphone paths (HPOUT1, HPOUT2, HPOUT3), when used as external
headphone or line output.
The HPOUTn outputs are ground-referenced, and the respective voltages may swing between +1.8V
and -1.8V. The ESD diode configuration must be carefully chosen.
The recommended ESD diode configuration for these ground-referenced outputs is illustrated in
Figure 88
. The ‘back-to-back’ arrangement is necessary in order to prevent clipping and distortion of
the output signal.
Note that similar care is required when connecting the WM8281 outputs to external circuits that
provide input path ESD protection - the configuration on those input circuits must be correctly
designed to accommodate ground-referenced signals.
WM8281
HPOUTnL
HPOUTnR
External Headphone/Line
output connection
External Headphone/Line
output connection
ESD Protection Diodes
Figure 88 ESD Diode Configuration for External Output Connections



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