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AS3421 Folha de dados(PDF) 16 Page - ams AG

Nome de Peças AS3421
Descrição Electrónicos  Low Power Ambient Noise-Cancel l ing Speaker Dr iver
PDF  61 Pages
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Fabricante Electrônico  AMSCO [ams AG]
Página de início  http://www.ams.com
Logo AMSCO - ams AG

AS3421 Folha de dados(HTML) 16 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
9.3.4
Over-Current Protection
The over-current protection has a threshold of 150-200mA and a debouncing time of 8 s. The stage is forced to OFF mode in an over-current
situation. After this, the headphone stage tries to power up again every 8ms as long as the over-current situation still exists or the stage is turned
off manually.
9.3.5
Parameter
VBAT=1.5V, TA= 25ºC, unless otherwise specified.
9.4 Operational Amplifier
While AS3421 offers only one operational amplifier for feed-forward ANC, AS3422 features an additional operational amplifier stage to support
feed-back ANC or any other additional needed filtering.
Both operational amplifiers stages can be activated and used individually. While OP1 stage is always configured as inverting amplifier, OP2
stage can be also switched to a non-inverting mode with an adjustable gain of 0...+10.5dB.
Figure 21. Operational Amplifiers
Table 6. Headphone Output Parameter
Symbol
Parameter
Condition
Min
Typ
Max
Unit
RL_HP
Load Impedance
Stereo mode
16
Ω
CL_HP
Load Capacitance
Stereo mode
100
pF
PHP
Nominal Output Power
RL=64
Ω
12
mW
RL=32
Ω
24
mW
RL=16
Ω
34
mW
PSRRHP
Power Supply Rejection Ratio
200Hz-20kHz, 720mVpp, RL=16
90
dB
AGND
IOP1L
OP1
IOP1R
QOP1R
QOP1L
IOP2L
OP2 non-inverting mode
IOP2R
QOP2R
QOP2L
AGND
0..10.5dB
AGND
0..10.5dB
AGND
IOP2L
OP2 inverting mode
IOP2R
QOP2R
QOP2L



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