© Semiconductor Components Industries, LLC, 2016

May, 2016 − Rev. 0

1

Publication Order Number:

SA3229/D

RHYTHM SA3229

Preconfigured DSP System

for Hearings Aids

Description

The RHYTHM

t SA3229 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, SA3229’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, SA3229 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

provides full programmability at the factory and in the field.

RHYTHM SA3229 is a single−chip hybrid with a one−time

programmable (OTP) memory intended for low cost applications

requiring high gain.

Features

Compression

Configurable Assignments of Control Parameters

Adjustment

www.onsemi.com

SIP25

HYBRID

CASE 127DZ

PAD CONNECTION

MARKING DIAGRAM

SA3229−E1

XXXXXX

SA3229

= Specific Device Code

E1

= RoHS Compliant Hybrid

XXXXXX = Work Order Number

(Bottom View)

1

2

3

4

5

6

7

8

9

10

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

See detailed ordering and shipping information on page 13 of

this data sheet.

ORDERING INFORMATION