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AS3543 Datenblatt(PDF) 23 Page - ams AG

Teilenummer AS3543
Bauteilbeschribung  High End Stereo Audio Codec wi th System PMU
PDF  92 Pages
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Hersteller  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3543 Datenblatt(HTML) 23 Page - ams AG

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Revision 1.11
22 - 91
AS3543 3v2
Data Sheet - D e t a 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
Figure 9. Headphone Change Gain Settings
8.4.4
Headphone Detection
When the headphone amplifier is powered down, one can detect the connection of a headset. It only work if the
headset is connected between pins HPR/HPL and HPCM. As long as the headphone amplifier is powered down,
HPCM is biased to 150mV and acting as the sense pin. There is a corresponding interrupt available to be enabled.
8.4.5
Over-current Protection
The headphone amplifier has an over-current protection (e.g. HPR/HPL is shorted). This over-current protection will
power down the headphone amplifier for a programmable time-out period (512ms, 0ms). There is a corresponding
interrupt available to be enabled.
Figure 10. Headphone Overcurrent OFF-ON Sequence
8.4.6
Ground Noise Cancelation
As separate ground input allows to connect a ground sense line direct from the dock connector ground or headphone
jack shield to make the audio output independent from PCB ground noise.
8.4.7
Power Options
To save power, especially when driving 32 Ohm loads, a reduction of the bias current is selected. For 16Ohm loads
the bias current can be increased.
8.4.8
Parameter
AVDD17=1.7, AVDD27=2.7, HPVDD = 2.7V, TA= 25
o
C, unless otherwise mentioned
Table 13. Headphone Output Parameter
Symbol
Parameter
Condition
Min
Typ
Max
Unit
RL_HP
Load Impedance
stereo mode
16
CL_HP
Load Capacitance
stereo mode
100
pF
PHP
Nominal Output Power
RL=16 , limiter enabled
RL=32 , limiter enabled
40
20
mW
AHP
Programmable Gain
-40.5
+6
dB
Gain Steps
discrete logarithmic gain steps
1.5
dB
Gain Step Accuracy
±0.25
dB



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