Gennum Corporation GA3205 Datasheet

GA3205

F

RONTWAVE

™

Multi-Microphone

Hybrid - GA3205

PRELIMINARY DATA SHEET

FEATURES

• 4 different modes of operation:

• directional

• directional equalized

• 1 mic omnidirectional

• 2 mic omnidirectional

• allows for mic port spacing from 6mm to 13mm

• calibration software automatically trims out mic
sensitivity mismatches

• variable time delay/directivity pattern

• 4 memories

• variable low frequency equalization (0 to 20dB)

• small package size

• compatible with all hearing aids

thinSTAX™ PACKAGING
Hybrid Typical Dimensions:

0.205 x 0.110 x 0.060in.
(5.21 x 2.79 x 1.52mm)

R5
92K

R7
460k

DESCRIPTION

The GA3205 is a multi-memory hybrid that, with the addition of
two microphones, can be used to produce a directional
response in any hearing aid. The four available memories can
be programmed to include any of the 4 modes of operation: 1
mic omnidirectional, 2 mic omnidirectional, directional, and
directional equalized. The variable time delay of the circuit
gives it the flexibility to offer a wide range of directivity patterns
(ie. cardioid to hypercardioid) for microphone port spacings
from 6mm to 13mm. Variable low frequency equalization
gives the flexibility to trade-off between bass response and
noise performance.

Calibration software automatically configures the hybrid for
the desired directivity pattern and adjusts the gain trim resistors
to compensate for micropohone sensitivity mismatches
enabling maximum directivity.

The GA3205 hybrid code programmed into the GP523 is "2".

VREG1 VREG2

11

5

C3
100n

V

B

2

C4
100n

GA3205

GP523

FRONT

6

MIC

GND2

7

REAR

12

MIC

1

GND1

Revision Date: September 1999

SW

C1
200n

C2
200n

10

SDA MS

GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone]

10k

10k

36k

-A

15k5

15k5

-B

8

16k

26k

R3
185k

6k

25k6k

26k

R4
184k

-C

C5
1n2

R2 45k5

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

BLOCK DIAGRAM

Web Site: www.gennum.com E-mail: [e-mail]

11k

REGULATOR

24k

R8
92k

R9
18k

-D

C6
4n4

R6
185k

3k9

Document No. 522 - 18 - 01

OUT

4

GA3205

ABSOLUTE MAXIMUM RATINGS

PAD CONNECTION

PARAMETER VALUE

GND2

MS SDA

V

REG1

Supply Voltage 2VDC

Power Dissipation 25mW
Operating Temperature -10 to + 40°C
Storage Temperature -20 to +70°C

CAUTION

ELECTROSTATIC

SENSITIVE DEVICES

DO NOT OPEN PACKAGES OR HANDLE

EXCEPT AT A STATIC-FREE WORKSTATION

FRONT

MIC

7

6

REG2

89

13

45

OUTV

3

10

2

V

B

11

12

1

GND1

REAR
MIC

ELECTRICAL CHARACTERISTICS

Conditions: Temperature 25 oC, Frequency = 1 kHz. R1 - Tap 15; R2 - Tap 15; R3 - Tap 0; R4 - Tap 0; R5 - Tap 0; R6 - Tap 0; R7 - Tap 3; R8 - Tap 14

RETEMARAPLOBMYSSNOITIDNOCNIMPYTXAMSTINU

tnerruCdirbyH I

egatloVmuminiMV

egatloVrotalugeRV

PMA

B

GER

niaGmetsySlanimoNNIAG -0-Bd

tsooBycneuqerFwoLmumixaMzH001@810222Bd

metsySfooitaRnoitcejeRylppuSrewoPRRSP

rotalugeRfooitaRnoitcejeRylppuSrewoPRRSP

∆G

∆G

TNORF

RAER

t

NIM

t

XAM

SYS

GER

0paT-2R5.42.701sµ

51paT-4R,0paT-2R520.3354sµ

egnaRtnemtsujdAniaGlennahCtnorF

egnaRtnemtsujdAniaGlennahCraeR

yaleDemiTmuminiM

yaleDemiTmumixaM

noitrotsiDcinomraHlatoTDHT-1.00.1%

esioNderrefeRtupnINRI31paT-7R,desolc=WS-5.3-Vµ

enatsiseRtuptuOR

(All conditions and parameters remain as shown in test circuit unless stated in condition column)

PO

041052004Aµ

-1.1-V
068029089Vm

-8-Bd

-22-Bd

-05-Bd

-07-Bd

-9.3-kΩ

522 - 18 - 01

2