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PDF AS3435 Data sheet ( Hoja de datos )
| Número de pieza | AS3435 | |
| Descripción | Integrated Active Noise Cancelling Solution | |
| Fabricantes | ams | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AS3435 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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General Description
Figure 1:
Added Value of Using AS3415/35
Benefits
All ANC Topologies
No mechanical audio bypass switch
Music EQ functionality
AS3415/AS3435
Integrated Active Noise Cancelling
Solution with Bypass Feature
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.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS3415/35, Integrated Active Noise
Cancelling Solution with Bypass Feature are listed below:
Features
Feed Forward, Feed Back and Hybrid
Integrated depletion mode transistors
Ultra flexible low power EQ circuit
ams Datasheet, Confidential: 2014-Jun-13 [v1-30]
AS3415/AS3435 – 1
1 page  
Pin Description
Pin Description
Figure 5:
Pin Description
The following figure shows the pin description for AS3415/35.
Pin Name
Pin Number
AS3435 AS3415
AGND
1 32
QLINL 2 1
LINL 3 2
TRSDA
4
3
TRSCL
LINR
QLINR
ANC / CSDA
MODE / CSCL
5
6
7
8
9
MICACL
MICL
ILED
MICS
MICR
10
11
12
13
14
MICACR
15
QMICR
IOP1R
QOP1R
16
17
18
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Pin Type
ANA OUT
ANA OUT
ANA IN
ANA IN
ANA IN
ANA IN
ANA IN
DIG IN
DIG IN
ANA OUT
ANA IN
ANA IN
SUP OUT
ANA IN
ANA OUT
ANA OUT
ANA IN
ANA OUT
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.
ams Datasheet, Confidential: 2014-Jun-13 [v1-30]
AS3415/AS3435 – 5
5 Page 
Detailed Description
Detailed Description
This section provides a detailed description of the device
related components.
Audio Line Input
The chip features one stereo line input for music playback. Due
to the fact that the line input gain stage operates as an inverting
amplifier, with access to the negative input pin and the output
pin, the gain can be freely configured. In monitor mode the line
inputs can also be muted in order to interrupt the music
playback and increase speech intelligibility.
Besides setting the gain with a resistor network, it is also
possible to do simple EQ functions for sound enhancement. The
EQ function can also be used to compensate for low frequency
bass losses in ANC headset with a feed-back topology. For
feed-forward headsets it can be used for sound enhancement
to compensate for example a lack of bass because of physical
design constraints of a headset.
Line Input Gain Setting
The line input gain can be configured with two external
resistors, R1 and R2, per channel as shown in Figure 8. The gain
can be calculated with the following formula:
ALine
=
20 ⋅ log -R---2- ...[dB]
R1
The resistors R1 and R2 should be in the range from 1kΩ to
100kΩ. If the application requires a gain of +6dB the resistor
value can be calculated as follows:
A----L---i--n--e
--6---
R2 = R1 ⋅ 10 20 = 10kΩ ⋅ 1020 = 20kΩ
For this example, a resistor value for R1 was defined as 10kΩ
This +6dB calculation yields a value for R2 of 20kΩ.
ams Datasheet, Confidential: 2014-Jun-13 [v1-30]
AS3415/AS3435 – 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3435.PDF ] | |
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