Datasheet

Maxim Integrated │ 142
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Headphone Ground Sense
To improve channel isolation, the device has a low-side
headphone sense (HPSNS) that senses the ground
return of the headphone load. For optimal performance,
connect the headphone sense line through an isolated
trace to a point as close as possible to the ground pole of
the headphone jack (Figure 38). If this is not possible, or
if headphone sense is not used, connect it to the analog
ground plane. In this configuration, channel isolation can
be degraded, resulting in increased channel-to-channel
crosstalk.
Figure 38. Headphone Output Ground Sense Connections
HEADPHONE
LEFT PGA
HEADPHONE
RIGHT PGA
CODEC
GROUND
PLANE
HEADPHONE
OUTPUT JACK
OPTIMAL GROUND SENSE CONFIGURATION ALTERNATIVE GROUND SENSE CONFIGURATION
HPR
HPSNS
HPL
HEADPHONE
LEFT PGA
HEADPHONE
RIGHT PGA
CODEC
GROUND
PLANE
HEADPHONE
OUTPUT JACK
HP SENSE
TO GROUND
ISOLATED HP
SENSE TRACE
HPR
HPSNS
HPL