AS3400 AS3410 AS3430
L o w P o w e r A m b i e n t N o i s e - C an c e l l i n g S p e a k e r D r i v e r
1 General Description
Line Input
Volume control via serial interface or volume pin
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 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.
64 steps @ 0.75dB and MUTE, pop-free gain setting
Single ended stereo or mono differential mode
ANC processing
Feed-forward cancellation
Feed-back cancellation with filter loop transfer function
definable via simple RC components
Simple in production SW calibration
An internal OTP-ROM can be optionally used to store the
microphones gain calibration settings.
12-30dB noise reduction (headset dependent)
10-2000Hz wide frequency active noise attenuation (headset
dependent)
The AS3400/10/30 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 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.
The filter loop is optimized by the user for specific handset electrical
and mechanical designs by dimensioning simple R, C components.
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.
Monitor Function
For assisted hearing, i.e. to monitor announcements
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
ANC with or without music on the receiving path
Improved dynamic range playback
OTP ROM for automatic trimming during production (4 times
programbable)
Performance Parameter
2 Key Features
Microphone Input
128 gain steps @ 0.375dB and MUTE with AGC
Differential, low noise microphone amplifier
Single ended or differential mode
Improved supply for electret microphone
MIC gain OTP programmable
High Efficiency Headphone Amplifier
2x34mW, 0.1% THD @ 16Ω, 1.5V supply,
100dB SNR
Bridged mode for e.g. 300Ω loads
Click and pop less start-up and mode switching
www.austriamicrosystems.com
5/3.8mA @ 1.5V stereo/mono ANC;
很抱歉,暂时无法提供与“AS3420 EK-ST”相匹配的价格&库存,您可以联系我们找货
免费人工找货