ams introduces world’s first noise cancellation speaker driver ICs to produce zero audible hiss
September 17 2013 - 2:00AM
Business Wire
ams AG (SIX: AMS), a leading provider of high performance analog
ICs and sensors, has introduced the AS3435 and AS3415 ANC speaker
drivers, paving the way for a new generation of noise cancellation
stereo headsets with zero audible hiss.
The AS3435 and AS3415 are also the industry’s first ANC (active
noise cancellation) ICs to feature integrated bypass switches,
offering headset manufacturers the freedom to create sleeker – and
cheaper – industrial designs.
The AS3435, for feedback systems, and AS3415, for feed-forward
systems, are the latest additions to the renowned portfolio of
analog ANC ICs from ams. Incorporating new ultra-low noise
amplifiers with a 900nV input referred noise floor, the devices are
the first ANC speaker drivers to produce no audible high-frequency
hiss when paired with low-noise microphones.
This means that manufacturers of audiophile products can replace
existing ANC solutions with the AS3435 and AS3415 to provide users
with an improved listening experience, benefiting from the devices’
outstanding audio characteristics including 35mW stereo output
power with THD+N of 0.1% into a 32Ω load and a typical
signal-to-noise ratio of >110dB.
The new ANC ICs from ams also provide for improvements to the
mechanical design of a headset’s housing. Conventional ANC headsets
require a mechanical switch, to activate a bypass mode. When the
headset’s battery is completely discharged, the user must bypass
the noise cancellation function in order to continue listening to
music via the Line In channel. The need to accommodate this switch
constrains the design of the headset’s housing and circuit
board.
The AS3435 and AS3415, however, feature integrated bypass
switches, so that the music signal coming from the 3.5mm audio jack
may be routed through the ANC chipset without any power source
connected to the device. By eliminating the external switch, this
feature helps to reduce bill-of-materials cost and the size of the
PCB, as well as relieving the designer of the need to accommodate a
mechanical switch on the headset’s housing.
At the same time, the devices’ analog implementation of noise
cancellation provides for power consumption often two or three
times lower than equivalent digital solutions. Featuring typical
power consumption of 10mW at 1.5V in noise cancellation mode,
either device can support operation for more than 100 hours from a
single AAA battery.
ams has supported the introduction of the AS3435 and AS3415 ANC
ICs with the release of an improved design tool, enabling the
quicker and easier development of the filter networks that match
the operation of noise cancellation to the sonic characteristics of
the headset design.
The straightforward graphical interface of the Windows-based ams
tool can display the entire signal chain across the user’s screen,
and provides a SPICE module for simulating the operation of filter
architectures.
In the AS3435 and AS3415, ams has also added a new bass boost
equalization capability, eliminating the need for a discrete signal
processing IC to perform equalization functions.
‘We incorporated these new features at the request of the
industry leaders in the noise-cancelling headsets. The AS3435 and
AS3415 will help headset OEMs to achieve new high levels of audio
quality in their next designs,’ said Oliver Jones, marketing
manager for ANC products at ams.
Price & Availability
The AS3415 and AS3435 ANC speaker driver ICs are available for
sampling now. The AS3435 feedback ANC IC is priced at $3.90 for
1,000 pieces. The AS3415 feed-forward ANC IC is priced at $3.50 for
1,000 pieces. The AS3435 is in a QFN36 package, and the AS3415 in a
QFN32 package, both 5mm x 5mm.
Technical Support
An evaluation kit for the AS3435 and AS3415 is available online
from ams. For further information on the AS3415/AS3435 or to
request samples, please visit www.ams.com/ANC/AS3415 and
www.ams.com/ANC/AS3435
Download Press Picture or Block Diagram of this IC at
http://www.ams.com/eng/Press/Press-Releases/AS34x5
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