Datasheet

MICBIAS
MIC3(L/R)
HPLOUT
HPROUT
MICDET
To Detection block
s
s
g m
s
g m s
sgStereo
Cellular
Stereo +
Cellular
m = mic
s = earspeaker
g = ground/midbias
AVDD
MICBIAS
MIC3(L/R)
HPLOUT
HPROUT
To
detection
block
HPCOM
1.35
MICDET
ToDetectionblock
s
s
g m
s
g m s
sg
Stereo
Cellular
Stereo+
Cellular
m=mic
s=earspeaker
g=ground/midbias
AVDD
TLV320AIC3107
SLOS545D –NOVEMBER 2008 –REVISED DECEMBER 2014 www.ti.com
10.3.12 Jack and Headset Detection
The TLV320AIC3107 includes extensive capability to monitor a headphone, microphone, or headset jack,
determine if a plug has been inserted into the jack, and then determine what type of headset/headphone is wired
to the plug. Figure 29 shows one configuration of the device that enables detection and determination of headset
type when a pseudo-differential (capless) stereo headphone output configuration is used. The registers used for
this function are Page-0/Reg 14, 37, 38, and 13. The type of headset detected can be read back from Page-
0/Reg-13. Note that for best results, it is recommended to select a MICBIAS value as high as possible, and to
program the output driver common-mode level at a 1.35V or 1.5V level.
Figure 29. Configuration of Device for Jack Detection Using a Pseudo-Differential (Capless) Headphone
Output Connection
A modified output configuration used when the output drivers are ac-coupled is shown in Figure 30. Note that in
this mode, the device cannot accurately determine the type of headset inserted if a mono or stereo headphone.
Figure 30. Configuration of Device for Jack Detection Using an ac-Coupled Stereo Headphone Output
Connection
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