SA3291 datasheet(8/20 Pages) ONSEMI

Part #	SA3291

Description	Preconfigured Wireless DSP System for Hearing Aids

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Manufacturer	ONSEMI [ON Semiconductor]

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AYRE SA3291

www.onsemi.com

8

TYPICAL APPLICATIONS

Figure 3. Test Circuit

OUT

200k

21

19

2

22

1

3

17

16

15

4

18

11

12

13

10

20

128 bands

*

**

Σ

14

6

8

7

9

3k75

VB

A/D

Wireless

Audio/Data

Adaptive

Directional

Microphone

or

FrontWave

Pre

Biquad

Filters

Frequency

Band

Analysis

Clock

Generator

Programming

Interface

MIC/TCOIL

COMP

Feedback

Canceller

Environmental

Classification

AGCO

Volume

Control

Post

Biquad

Filters

3 & 4

WDRC (1,2,4,6 or 8 Channels)

Noise Reduction (128 bands)

Graphic EQ (16 bands)

EEPROM

Data

Logging

Frequency

Band

Synthesis

Post

Biquad

Filters

1 & 2

Control

A/D

Wideband

Gain

Noise Generator

and Shaper

Cross

Fader

Acoustic

Indicators

POR Circuitry

Peak

Clipper

D/A

Hbridge

Voltage

Regulator

LP Filter

M

U

X

* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI

** If Input Mode = 2 mic omni, rear only, directional

Note: All resistors in ohms and all capacitors in farads, unless otherwise stated.

Control

(MS/DIGVC)

Figure 4. Typical Application Circuit

* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI

** If Input Mode = 2 mic omni, rear only, directional

Note: All resistors in ohms and all capacitors in farads, unless otherwise stated.

VB

21

19

22

1

3

17

16

15

4

18

11

12

13

10

20

128 bands

*

**

Σ

14

6

8

Zero Biased

7

9

A/D

Wireless

Audio/Data

Adaptive

Directional

Microphone

or

FrontWave

Pre

Biquad

Filters

Frequency

Band

Analysis

Clock

Generator

Programming

Interface

MIC/TCOIL

COMP

Feedback

Canceller

Environmental

Classification

AGCO

Volume

Control

Post

Biquad

Filters

3 & 4

WDRC (1,2,4,6 or 8 Channels)

Noise Reduction (128 bands)

Graphic EQ (16 bands)

EEPROM

Data

Logging

Frequency

Band

Synthesis

Post

Biquad

Filters

1 & 2

Control

(MS/DIGVC)

Control

A/D

Wideband

Gain

Noise Generator

and Shaper

Cross

Fader

Acoustic

Indicators

POR Circuitry

Peak

Clipper

D/A

Hbridge

Voltage

Regulator

M

U

X

Receiver

2

T−coil

NFMI coil

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