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AS3421 Datasheet(PDF) 15 Page - ams AG

No. de pieza AS3421
Descripción Electrónicos  Low Power Ambient Noise-Cancel l ing Speaker Dr iver
PDF  61 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

AS3421 Datasheet(HTML) 15 Page - ams AG

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AS3421 AS3422
Datasheet - D e t a i l e d D e s c r i p t i o n
9.3 Headphone Output
The headphone output is a true ground output using VNEG as negative supply, designed to provide the audio signal with 2x12mW @ 16
Ω-64Ω,
which are typical values for headphones. It is also capable to operate in bridged mode for higher impedance (e.g. 300
Ω) headphone. In this
mode the left output is carrying the inverted signal of the right output shown in Figure 20.
Figure 19. Headphone Output Single Ended Mode
Figure 20. Headphone Output Differential Mode
9.3.1
Input Multiplexer
The signal from the line-input gain stage gets summed at the input of the headphone stage with the microphone gain stage output, the first filter
opamp output or the second filter opamp output. The microphone gain stage output is used per default. It is also possible to playback without
ANC by only using the line-input gain stage with no other signal on the multiplexer.
For the monitor mode, the setting of this input multiplexer can be changed to another source, normally to the microphone.
9.3.2
No-Pop Function
The No-Pop startup of the headphone stage takes 60ms to 120ms dependent on the supply voltage.
9.3.3
No-Clip Function
The headphone output stage gets monitored by comparator stages which detect if the output signal starts to clip.
This signal is used to reduce the LineIn gain to avoid distortion of the output signal. A hystereses avoids jumping between 2 gain steps for a
signal with constant amplitude.
Pop
Click
Control
HPR
HPL
AGND
LineInR
QOP2R
QOP1R
QMicR
LineInL
QOP2L
QOP1L
QMicL
HPVSS
HPVDD
open
open
LineIn
gain stage



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