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PDF AS3412 Data sheet ( Hoja de datos )
| Número de pieza | AS3412 | |
| Descripción | Ultra Small ANC Speaker Driver | |
| Fabricantes | ams | |
| Logotipo |  |
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General Description
Figure 1:
Added Value of Using AS3412
Benefits
• Low noise floor
• Integrated music bypass switch
• Smallest ANC form factor
AS3412
Ultra Small ANC Speaker Driver
The AS3412 is a speaker driver with Ambient Noise Cancelling
function for headsets, headphones or ear pieces. They are
intended to improve quality of e.g. music listening, a phone
conversation etc. by reducing background ambient noise.
The fully analog implementation allows the lowest power
consumption, lowest system BOM cost and most natural
received voice enhancement otherwise difficult to achieve with
DSP implementations. The device is designed to be easily
applied to existing architectures.
An internal OTP-ROM can be optionally used to store the
microphones gain calibration settings. The AS3412 can be used
in different configurations for best trade-off in terms of noise
cancellation, required filtering functions and mechanical
designs. The AS3412 targeting feed-forward topology is used
to effectively reduce frequencies typically up to 2-3 kHz.
The filter loop for the system is determined by measurements,
for each specific headset individually, and depends very much
on mechanical designs. The gain and phase compensation filter
network is implemented with cheap resistors and capacitors for
lowest system costs.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of this device are listed below:
Features
• Low noise amplifiers
• Depletion mode transistors for passive music bypass
• WL-CSP package (2.2x2.2mm, 0.4mm pitch)
Applications
The devices are ideal for Ear Pieces, Headsets, Hands-Free Kits,
Mobile Phones, and Voice Communicating Devices.
ams Datasheet
[v1-00] 2016-Apr-06
Page 1
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AS3412 − Absolute Maximum Ratings
Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. Functional operation of the device at these or any
other conditions beyond those indicated under Electrical
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Figure 5:
Absolute Maximum Ratings of AS3412
Symbol
Parameter
Min Max Units
Comments
Electrical Parameters
VGND_MAX Ground Terminals
-0.5
0.5
V
Applicable for pin AGND and
GND
VSUP_MAX
Supply Voltage to
Ground
-0.5 2.1 V Applicable for pin VBAT
VNEG_MAX Negative Terminals
-2.0 0.5 V Applicable for pin VNEG
VCP_MAX
Charge Pump
Terminals
VNEG-0.5 VNEG+0.5 V Applicable for pins CPN and CPP
VHP_MAX Headphone Pins
VNEG-0.5 VNEG+0.5 V Applicable for pins HPR and HPL
VANA_MAX Analog Pins
Applicable for pins LINL, LINR,
MICL/R, HPR, HPL, QMICL/R,
VNEG-0.5 VNEG+0.5 V IOP1x, QOP1x, CPP, CPN,
TRSCL/BPR, TRSDA/BPL, MICACL
and MICACR
VCON_MAX Control Pins
VNEG-0.5
5
V
Applicable for pins ANC/CSDA
and MODE/CSCL
VOTHER_MAX Other Pins
VNEG-0.5
5
V Applicable for pins MICS
ISCR
Input Current (latch-up
immunity) (1) (2)
±100
mA JEDEC 17
Continuous Power Dissipation (TA = 70°C)
PT
Continuous power
dissipation
- tbd mW
Electrostatic Discharge
ESDHBM
Electrostatic Discharge
HBM
± 2000
V JEDEC JESD22-A114C
Temperature Ranges and Storage Conditions
RTHJA
Junction to Ambient
Thermal Resistance
tbd
tbd °C/W
ams Datasheet
[v1-00] 2016-Apr-06
Page 5
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5 Page 
AS3412 − Detailed Description
To avoid unwanted start-up pop noise, a soft-start function is
implemented for an automatic gain ramping of the device. In
case of an overload condition on the microphone input (e.g.
high sound pressure level), an internal state machine reduces
the microphone gain automatically. For some designs it might
be useful to switch off this feature. Especially in feed-back
systems very often infrasound can cause an overload condition
of the microphone preamplifier which results in low frequency
noise. This behavior can be avoided by disabling the AGC
function.
Input Capacitor Selection
The microphone preamplifier needs one bias resistor (RBias) per
channel as well as DC blocking capacitors (CMIC). The capacitors
CAC are DC blocking capacitors to avoid DC amplification of the
non-inverting microphone preamplifier. This capacitor has an
influence on the frequency response because the internal
feedback resistors create a high pass filter together with the
capacitor CAC. The typical application circuit is shown in
Figure 11 with all necessary components.
Figure 11:
Microphone Capacitor Selection Circuit
MICS
RBIAS
ANC Microphone
ANC Microphone
CMIC
CMIC
MICS
RBIAS
MICL
RMICIN
CAC
MICACL
CAC
RMICIN
MICACR
MICR
MUTE_MIC_LEFT
MUTE
MUTE
MUTE_MIC_RIGHT
AGC QMICL
AGC QMICR
Microphone Capacitor Selection Circuit: This diagram shows a typical microphone application circuit with all
necessary components to operate the amplifier.
ams Datasheet
[v1-00] 2016-Apr-06
Page 11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3412.PDF ] | |
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