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GA3216 Datasheet

  • GA3216

  • GA3216 - Single or Dual Channel DSP Compression System

  • 14頁

  • ETC

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FOUNDATION鈩?Digital
Single or Dual Channel
DSP Compression System
GA3216 PRELIMINARY DATA SHEET
FEATURES
鈥?efficient, high fidelity 1 or 2-channel WDRC signal
processing
鈥?fully programmable via serial data interface
鈥?four trimmer inputs plus volume control
鈥?flexible trimmer/parameter assignments
鈥?optional two-terminal or three-terminal trimmers
鈥?choice of wideband or independent 2-channel level
detection
鈥?choice of two strategies for AGC-I parametric
adjustment
鈥?6, 12 or 24 dB/octave band split filter or configurable
as single-channel compressor.
鈥?in-channel, low level squelch control (1:2 expansion)
鈥?output compression limiting (AGC-O)
鈥?flexible pre- and post-emphasis filters
鈥?four independent memories
鈥?pulse-density-modulated output stage drives zero-
bias 2-terminal receivers
thinSTAX鈩?PACKAGING
Hybrid typical dimensions:
0.190 x 0.123 x 0.060in
(4.82 x 3.12 x 1.52mm)
DESCRIPTION
The GA3216 hybrid is a trimmer-configurable DSP system
based on a two-channel compression circuit. It can
efficiently replace traditional hearing-aid compression
circuits without compromising fundamental performance
requirements.
A trimmer interface supports manual circuit configuration. It
continuously monitors trimmer positions and translates them
into the hearing-aid parameters of choice. A serial data
interface provides full programmability both at the factory
and in the field.
The GA3216 includes in-channel squelch to attenuate
microphone and circuit noise in quiet environments. It also
includes
low-distortion
compression
limiting
and
programmable high and low cut filters as well as five
configurable equalization filters. Unused blocks can be
powered down to save battery current, for example, when
using the device in single-channel mode.
GA3216
MS2
14
MS
13
SDA
12
PROGRAMMING
INTERFACE
EEPROM
TONE
GENERATOR
1st or 2nd
ORDER
HC
EQ1
EQ4
VB
11
VREG2
19
VREG
1
REGULATOR
TWIN DETECTOR
HP
COMPRESSOR
TWIN DETECTOR
危
EQ5
10
8
9
7
VBP
OUT+
OUT -
PGND
IN
16
T
17
A/D
T-coil EQ
1st to 3rd
ORDER
LC
24db/oct
BAND SPLIT
FILTER
SQUELCH
PEAK
CLIPPING
D/A
HBRIDGE
COMPRESSOR
LP
TWIN DETECTOR
SQUELCH
AGC-O
EQ2
TWIN DETECTOR
MGND
15
TRIMMER INTERFACE
EQ3
VC GAIN
GA3216
5
2
3
4
18
20
6
VC
TR1
TR2
TR3
TR4
GND2
GND1
BLOCK DIAGRAM
Doc.No.24501 - 1 [Rev. July 2003]
1 of 14

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