austriamicrosystems AS3542, Manual, Page: 19 / 86

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AS3542 3v2
Data Sheet, Strictly Confidential - D e ta i l e d D e s c r i p t i o n - A u d i o F u n c t i o n s
8.3.4 Parameter
AVDD17=1.7, AVDD27=2.7, T
A
= 25
o
C, unless otherwise mentioned
8.3.5 Register Description
8.4 Headphone Output
The headphone output is designed to provide the audio signal with 2x40mW @ 16
Ω
or 2x20mW @32
Ω
, which are typ-
ical values for headphones.
This AFE has a combined output stage for headphone and line output with an independent gain regulation for left and
right channel with 32 steps @ 1.5dB each. The gain can be set from -40.5dB to +6dB.
Figure 6. Headphone Output
Table 10. Line Output Parameter
Symbol Parameter Condition Min Typ Max Unit
R
L_LO
Load Impedance
(Stereo Mode)
line inputs nominally have 10k Ω 5 k Ω
C
L_LO
Load Capacitance
(Stereo Mode)
100 pF
A
LO
Programmable Gain -40.5 +6 dB
Gain Steps discrete logarithmic gain steps 1.5 dB
Gain Step Accuracy ±0.25 dB
A
LOMUTE
Mute Attenuation 100 dB
Table 11. Line Output Related Register
Name Base Offset Description
OUT_R 2-wire serial 00h
Right Line Output volume settings, MUX control
OUT_L 2-wire serial 01h
Left Line Output volume settings
AudioSet2 2-wire serial 15h
Auto fading timing settings
AudioSet3 2-wire serial 16h Enable/disable mixer input