Product Brief
AS3400 AS3410 AS3430
Low Power Ambient Noise-Cancelling Speaker Driver
Line Input
1 General Description
ꢀ volume control via serial interface or volume pin
ꢀ 64 steps @ 0.75dB and MUTE, pop-free gain setting
ꢀ single ended stereo or mono differential mode
The AS3400/10/30 are speaker driver with Ambient
Noise Cancelling function for handsets, headphones or
ear pieces. It is intended to improve quality of e.g. music
listening, a phone conversation etc. by reducing back-
ground ambient noise.
ANC processing
ꢀ feed-forward cancellation
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.
ꢀ feed-back cancellation with filter loop transfer func-
tion definable via simple RC components
ꢀ simple in production SW calibration
ꢀ 12-30dB noise reduction (headset dependent)
An internal OTP-ROM can be optionally used to store
the microphones gain calibration settings.
ꢀ 10-2000Hz wide frequency active noise attenuation
(headset dependent)
The AS3400/10/30 can be used in different configura-
tions for best trade-off of noise cancellation, required fil-
tering functions and mechanical designs.
Monitor Function
ꢀ for assisted hearing, i.e. to monitor announcements
The simpler feed-forward topology is used to effectively
reduce low frequency background noise. The feed-back
topology with either 1 or 2 filtering stages can be used to
reduce noise for a larger frequency range, and to even
implement transfer functions like speaker equalization,
Baxandall equalization, high/low shelving filter and to set
a predefined loop bandwidth.
ꢀ fixed (OTP prog.) ambient sound amplification to
compensate headphone passive attenuation
ꢀ volume controlled ambient sound amplification
mixed with fixed (OTP prog.) attenuation of LineIn
Incremental Functions
The filter loop is optimized by the user for specific hand-
set electrical and mechanical designs by dimensioning
simple R, C components.
ꢀ ANC with or without music on the receiving path
ꢀ improved dynamic range playback
ꢀ OTP ROM for automatic trimming during production
Most handset implementations will make use of a single
noise detecting microphone. Two microphones could be
used to allow for increased flexibility of their location in
the handset mechanical design. Using the bridged mode
allows to even drive high impedance headsets.
(4 times programbable)
Performance Parameter
ꢀ 5/3.8mA @ 1.5V stereo/mono ANC; <1uA quiescent
ꢀ extended PSRR for 217Hz
Interfaces
ꢀ 2 wire serial control mode & volume inputs
2 Key Features
Microphone Input
ꢀ 128 gain steps @0.375dB and MUTE with AGC
ꢀ calibration via Line-In or 2-wire serial interface
ꢀ single cell or fixed 1.0-1.8V supply with internal CP
ꢀ differential, low noise microphone amplifier
ꢀ single ended or differential mode
ꢀ improved supply for electret microphone
ꢀ MIC gain OTP programmable
Package
ꢀ AS3400, AS3410 QFN24 [4x4mm] 0.5mm pitch
ꢀ AS3430 QFN32 [5.x5mm] 0.5mm pitch
High Efficiency Headphone Amplifier
ꢀ 2x34mW, 0.1% THD @ 16Ω, 1.5V supply,
3 Applications
Ear pieces, Headsets, Hands-Free Kits, Mobile Phones,
Voice Communicating Devices
100dB SNR
ꢀ bridged mode for e.g. 300Ω loads
ꢀ click and pop less start-up and mode switching
www.austriamicrosystems.com
Revision 0.2
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