AS3415/AS3435
Integrated Active Noise Cancelling
Solution with Bypass Feature
General Description
The AS3415/35 are speaker drivers 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 AS3415/35 can be
used in different configurations for best trade-off of noise
cancellation, required filtering functions and mechanical
designs.
The simpler feed-forward topology is used to effectively reduce
frequencies typically up to 2-3 kHz. The feed-back topology
with either 1 or 2 filtering stages has its strengths especially at
very low frequencies. The typical bandwidth for a feed-back
system is from 20Hz up to 1 kHz which is lower than the
feed-forward systems.
The filter loop for both systems 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.
Key Benefits & Features
The benefits and features of AS3415/35, Integrated Active Noise
Cancelling Solution with Bypass Feature are listed below:
Figure 1:
Added Value of Using AS3415/35
Benefits
All ANC Topologies
No mechanical audio bypass switch
Music EQ functionality
Longest play time
Highest audio quality
Features
Feed Forward, Feed Back and Hybrid
Integrated depletion mode transistors
Ultra flexible low power EQ circuit
10mW @1.5V stereo ANC; <1μA quiescent
2x24mW, 0.1% THD+N @ 32Ω, 1.5V supply
ams Datasheet, Confidential: 2013-Sep [1-10]
AS3415/AS3435 – 1
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General Description
Benefits
Smallest package
Low battery indication
Different control interface options
Highly innovative production trimming interface
Active hearing mode with or without ANC and
optional voice EQ
Features
Two different packages available:
• AS3415 QFN32 [5x5mm] 0.5mm pitch
• AS3435 QFN36 [5x5mm] 0.4mm pitch
LED driver with selectable driving strength
Push Button-, Slide switch- or I²C control interface
OTP production trimming via audio interface
Monitor mode function
Applications
The devices are ideal for:
• Ear pieces
• Headsets
• Hands-Free Kits
• Mobile Phones
• Voice Communicating Devices
Block Diagram
The functional blocks of AS3415/35 for reference are
shown below:
Figure 2:
AS3415 Block Diagram
AS3415 Block Diagram:
This figure shows the block diagram of the AS3415 with all relevant system
components.
AS3415/AS3435 – 2
ams Datasheet, Confidential: 2013-Sep [1-10]
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General Description
Figure 3:
AS3435 Block Diagram
AS3435 Block Diagram:
This figure shows the block diagram of the AS3435 with all relevant system
components.
ams Datasheet, Confidential: 2013-Sep [1-10]
AS3415/AS3435 – 3
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Pin Assignment
Pin Assignment
Figure 4:
Pin Assignments
T
he AS3415 and AS3435 pin assignments are described below.
Warning: Exposed pad must be connected to VNEG. Exposed pad must NOT be unconnected!
Pin Assignments:
Shows the pin assignment of the AS3415 and AS3435 (Top View).
AS3415/AS3435 – 4
ams Datasheet, Confidential: 2013-Sep [1-10]
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Pi n D e s c r i p t i o n
Pin Description
Figure 5:
Pin Description
The following figure shows the pin description for AS3415/35.
Pin Number
Pin Name
AS3435
AGND
QLINL
LINL
TRSDA
1
2
3
4
Pin Type
AS3415
32
1
2
3
ANA OUT
ANA OUT
ANA IN
ANA IN
Description
Analog reference ground. Do not connect this
pin to power or digital ground plane.
Line input EQ gain stage output left channel.
Line input EQ left channel.
Clock input for production trimming. Can be
connected to LINL pin to enable production
trimming via 3.5mm audio jack.
Data input for production trimming. Can be
connected to LINR pin to enable production
trimming via 3.5mm audio jack.
Line input EQ right channel.
Line input EQ gain stage output right channel.
Serial interface data for I²C interface and
ANC control to enable/disable ANC.
Serial Interface Clock for I²C interface and control
pin for power up/down and Monitor mode.
Microphone preamplifier AC coupling ground
terminal. This pin requires a 10μF capacitor
connected to AGND pin.
ANC microphone input left channel.
Current sink input for on-indication LED.
Microphone Supply output. This pin needs an
output blocking capacitor with 10μF.
ANC microphone preamplifier input right
channel.
Microphone preamplifier AC coupling ground
terminal. This pin requires a 10μF capacitor
connected to AGND pin.
ANC microphone preamplifier output right
channel.
ANC filter OpAmp1 input right channel.
ANC filter OpAmp1 output right channel.
TRSCL
LINR
QLINR
ANC / CSDA
MODE / CSCL
5
6
7
8
9
4
5
6
7
8
ANA IN
ANA IN
ANA IN
DIG IN
DIG IN
MICACL
MICL
ILED
MICS
MICR
10
11
12
13
14
9
10
11
12
13
ANA OUT
ANA IN
ANA IN
SUP OUT
ANA IN
MICACR
15
14
ANA OUT
QMICR
IOP1R
QOP1R
16
17
18
15
16
17
ANA OUT
ANA IN
ANA OUT
ams Datasheet, Confidential: 2013-Sep [1-10]
AS3415/AS3435 – 5
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