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SB3229-E1-T Datasheet(PDF) 7 Page - ON Semiconductor

No. de pieza SB3229-E1-T
Descripción Electrónicos  Preconfigured DSP System
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SB3229-E1-T Datasheet(HTML) 7 Page - ON Semiconductor

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RHYTHM SB3229
www.onsemi.com
7
TYPICAL APPLICATIONS (continued)
Figure 4. Typical Trimmer Application Circuit
Note: All resistors in ohms and all capacitors in farads, unless otherwise stated.
TONE
GENERATOR
VB
22
47
μ
VC
TR1
TR2 TR3
TR4
MS
A/D
A/D
TRIMMER/VC INTERFACE
PROGRAMMING
INTERFACE
REGULATOR
D/A
HBRIDGE
SB3229
PRE BIQUAD FILTERS
1−4
+
AGC−O
POST BIQUAD FILTERS
1 & 2
POST BIQUAD FILTERS
3 & 4
CROSS
FADER
1
22
20
19
18
17
15
14
16
12
11
8
7
6
5
4
3
2
13
NOISE GENERATOR
EVOKE
1, 2 or 4 CHANNEL
WDRC
BIQUAD 1−4
Reed Switch
For Autotcoil
MIC / TELECOIL
COMPENSATION
FEEDBACK
CANCELLER
PEAK
CLIPPING
VC GAIN
WIDEBAND GAIN
910
21
SB3229 OVERVIEW
SB3229
is
a
DSP
system
implemented
on
ON Semiconductor’s Wolverine
t hardware platform.
Wolverine
is
the
hearing
industry’s
first
90 nm
Silicon−on−Chip
platform
enabling
design
of
highly−efficient and flexible hearing aid solutions. The
device is packaged for easy integration into a wide range of
applications from CIC to BTE. SB3229 can be used as
a programmable or trimmer adjustable device. It may be
configured as one, two or four channels with linear or
WDRC
processing.
Configuration
data
stored
in
non−volatile memory defines hearing−aid parameters.
SB3229 can be programmed via the SDA or I2C
programming interfaces.
The
DSP
core
implements
Adaptive
Feedback
Cancellation, compression, wideband gain, and volume
control. The Adaptive Feedback Canceller reduces acoustic
feedback while offering robust performance against pure
tones.
During trimmer mode operation, a low−speed A/D circuit
monitors the positions of up to four manual trimmers and
a
VC potentiometer. Trimmer position changes are
immediately interpreted and translated into new circuit
parameter values, which are then used to update the signal
path.
FUNCTIONAL BLOCK DESCRIPTION
A/D and D/A Converter
The system’s A/D converter is a 2nd−order sigma−delta
modulator operating at a 2.048 MHz sample rate.
The system’s input is pre−conditioned with anti−alias
filtering and a programmable gain pre−amplifier. The
analog output is oversampled and modulated to produce a
1−bit pulse density modulated (PDM) data stream. The
digital PDM data is then decimated down to pulse−code
modulated (PCM) digital words at the system’s sampling
rate of 32 kHz.
The D/A is comprised of a digital 3rd−order sigma−delta
modulator and an H−bridge. The modulator accepts PCM
audio data from the DSP path and converts it into a 64−times
oversampled, 1−bit PDM data stream, which is then
supplied to the H−bridge. The H−bridge is a specialized
CMOS output driver used to convert the 1−bit data stream
into
a low−impedance,
differential
output
voltage
waveform suitable for driving zero−biased hearing aid
receivers.


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