RHYTHM SB3229
Preconfigured DSP System
for Hearings Aids
Description
The RHYTHMt SB3229 hybrid from ON Semiconductor is
a trimmer−configurable DSP system based on a four−channel
compression circuit featuring a feedback cancellation algorithm.
Based on a phase cancellation method, SB3229’s adaptive feedback
reduction algorithm provides added stable gain to enable extra gain
and user comfort. It features rapid adjustment for dynamic feedback
situations and resistance to tonal inputs.
www.onsemi.com
25 PAD
HYBRID
CASE 127DN
In addition to these adaptive algorithms, SB3229 also supports the
following features: up to four channel WDRC, low−distortion
compression limiting, cross fading between audio paths for click−free
memory changes, eight−band graphic equalizer, eight configurable
generic biquad filters, programming speed enhancements, in−channel
squelch to attenuate microphone and circuit noise in quiet
environments, optional peak clipping, flexible compression
adjustments, volume control, rocker switch, noise generation for
Tinnitus treatment, and industry−leading security features to avoid
cloning and software piracy.
PAD CONNECTION
18
VIN1
1
2
VIN2
17
VREG
19
TR4
16
15
14
13
12
11
MGND
GND
TIN
DAI
VC
20
TR3
3
A trimmer interface supports manual circuit configuration. It
continuously monitors trimmer positions and translates them into
21
TR2
PGND
2
4
5
6
7
the hearing−aid parameters of choice. A Serial Data or I C Interface
provides full programmability at the factory and in the field.
The SB3229 hybrid contains a 256 kbit EEPROM intended for
programmable and trimmer based devices.
22
TR1
OUT+
OUT−
VBP
D_VC
SDA
23
N/C
Features
• Adaptive Feedback Cancellation
• WDRC Compression with Choice of 1, 2 or 4 Channels of
Compression
CLK
MS1
25
24
VB
10
9
8
• Auto Telecoil with Programmable Delay
• EVOKE LITEt Acoustic Indicators
• Noise Generator for Tinnitus Treatment or In−Situ Audiometry
MS2
(Bottom View)
• Frequency Response Shaping with Graphic EQ
MARKING DIAGRAM
• Trimmer Compatibility – Four Three−Terminal Trimmers with
Configurable Assignments of Control Parameters
2
SB3229−E1
XXXXXX
• I C and SDA Programming
• Rocker Switch Support for Memory Change and/or Volume Control
Adjustment
SB3229 = Specific Device Code
E1 = RoHS Compliant Hybrid
XXXXXX = Work Order Number
• Support for Active Hi or Active Lo Switching
• Analog or Digital Volume Control with Programmable Range
• High Quality 20−bit Audio Processing
• High Power/High Gain Capability
• SOUNDFIT Fitting Software
ORDERING INFORMATION
See detailed ordering and shipping information on page 13 of
this data sheet.
• Configurable Low Battery Indicator
© Semiconductor Components Industries, LLC, 2014
1
Publication Order Number:
November, 2014 − Rev. 5
SB3229/D