© Semiconductor Components Industries, LLC, 2016

April, 2016 − Rev. 8

1

Publication Order Number:

SA3291/D

AYRE SA3291

Preconfigured Wireless DSP

System for Hearing Aids

Description

Ayre

t SA3291 is a preconfigured wireless DSP system utilizing

Near−Field Magnetic Induction (NFMI) technology.

Ayre SA3291 enables hearing aids to wirelessly synchronize

program modes and volume control and stream telecoil signals from

one hearing aid to the other. When coupled with a relay device, Ayre

SA3291 enables features such as stereo audio streaming via

Featuring iSceneDetect

t environmental classification, adaptive

noise reduction, superior feedback cancellation, fully automated and

adaptive microphone directionality, and up to 8−channel WDRC, Ayre

SA3291 is ideal for high−end, full−featured wireless products.

Binaural Synchronization − The binaural synchronization feature

allows two hearing aids to wirelessly synchronize adjustments such as

program modes or volume control. By working together as one

system, user control is simplified.

Binaural Telecoil − The binaural telecoil wirelessly streams telecoil

audio signals from one hearing aid to the other. This enables hearing

aid users to hear phone calls in both ears, improving speech

intelligibility.

Stereo Audio Streaming − Stereo audio signals can be streamed

wirelessly from a relay device to hearing aids equipped with Ayre

SA3291. A relay device can use Bluetooth or other far−field wireless

technology to wirelessly connect with TVs, music players, mobile

phones or other audio sources.

Acoustic Environment Classification − The iSceneDetect 1.0

environmental classification algorithm is capable of analyzing the

hearing aid wearer’s acoustic environment and automatically

optimizes the hearing aid to maximize comfort and audibility.

iLog

] 4.0 Datalogging − Enables the recording of various hearing

aid parameters such as program selection, volume setting and ambient

sound levels. The sampling interval can be configured to record from

every 4 seconds up to once every 60 minutes. The fitting system can

present the data to help the fitting specialist fine tune the hearing aid

and counsel the wearer.

EVOKE

[ Advanced Acoustic Indicators − Allows

manufacturers to provide more pleasing, multi−frequency tones

simulating musical notes or chords to indicate events such as program

or volume changes.

Automatic Adaptive Directionality − The automatic Adaptive

Directional Microphone (ADM) algorithm automatically reduces the

level of sound sources that originate from behind or to the side of the

hearing aid wearer without affecting sounds from the front. The

algorithm can also gather input from the acoustic environment and

automatically select whether directionality is needed or not,

translating into additional current savings.

Adaptive Feedback Cancellation − Automatically reduces

acoustic feedback. It allows for an increase in the stable gain while

minimizing artifacts for music and tonal input signals.

www.onsemi.com

SIP32

HYBRID

CASE 127DW

PAD CONNECTION

MARKING DIAGRAM

SA3291A−E1

XXXXXX

SA3291A = Specific Device Code

E1

= RoHS Compliant Hybrid

XXXXXX = Work Order Number

(Bottom View)

GND

VIN1

PGND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

32

27

28

29

30

31

TIN

VREG

VC

GPIO7/

DIGVC

L2

NGND

L1

NVB

VBP

DAI

VB

GPIO0/

MS1

GPIO1/

MS2

PCSDA

PCCLK

OUT−

OUT+

MGND

VIN2

See detailed ordering and shipping information on page 17 of

this data sheet.

ORDERING INFORMATION