FEATURES
Realtime digital signal processing
Small, 18-pin,
easy-to-interface package
A/D converters
on-board
Single supply (5V) operation
Low current
consumption (3mA max)
Internal or external oscillator
option
Standard serial RS232 diagnostic data I/O
available
Gain range externally configurable
Choice of
Serial/Parallel output to external MDAC or other
attenuator
Signal-to-noise ratio and distortion figures set
by external gain attenuator circuit, in order to tailor cost with
desired performance
Available in plastic DIP (through-hole)
and SOIC (surface mount) packages, as well as chip-on-board
format
Available in Commercial (0C to +70C), Industrial (-40C
to +85C) and Automotive (-40C to +125C) temperature
ranges
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OVERVIEW
The
DSS1100™ provides a sophisticated, highly-integrated single-chip
solution for ambient noise compensation. The DSS1100 utilizes a
fully adaptive DSP algorithm that takes into account the feedthrough
of the source signal to the sense microphone to make any setup
totally free from instability problems.
In addition, the DSS1100
employs a psychoacoustic model for computing the impact on
intelligibility/audibility due to ambient noise, that takes into
consideration frequency and time domain information.
 The line and mic audio signals are digitized by built-in
A/D converters and the computed gain is made available on a 6 bit
bus for driving a parallel MDAC. The gain range is selectable with a
choice of 12dB and 22dB (linear in dB). The selection is made by
means of a pullup resistor on G0. The gain range is sampled and
fixed at power up, or after every reset.
A serial data stream (RS232
asynch format) is available on the DATA OUT pin for gathering
operating statistics.
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