© Semiconductor Components Industries, LLC, 2014
November, 2014 − Rev. 5
1 Publication Order Number:
SB3229/D
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.
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.
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 or I
2
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.
Features
• Adaptive Feedback Cancellation
• WDRC Compression with Choice of 1, 2 or 4 Channels of
Compression
• Auto Telecoil with Programmable Delay
• EVOKE LITEt Acoustic Indicators
• Noise Generator for Tinnitus Treatment or In−Situ Audiometry
• Frequency Response Shaping with Graphic EQ
• Trimmer Compatibility – Four Three−Terminal Trimmers with
Configurable Assignments of Control Parameters
• I
2
C and SDA Programming
• Rocker Switch Support for Memory Change and/or Volume Control
Adjustment
• 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
• Configurable Low Battery Indicator
www.onsemi.com
25 PAD
HYBRID
CASE 127DN
PAD CONNECTION
MARKING DIAGRAM
SB3229−E1
XXXXXX
SB3229 = Specific Device Code
E1 = RoHS Compliant Hybrid
XXXXXX = Work Order Number
(Bottom View)
1
2
3
4
5
6
7
8910
11
12
13
14
15
16
17
18
VIN1
19
TR4
20
TR3
21
TR2
22
TR1
23
N/C
25 24
VIN2
TIN
DAI
VC
D_VC
SDA
CLK
MS1
VREG
MGND
GND
PGND
OUT+
OUT−
VBP
VB
MS2
N/C
N/C
See detailed ordering and shipping information on page 13 o
this data sheet.
ORDERING INFORMATION
