GA3205 Datasheet, PDF (1/6 Pages) Gennum Corporation – FRONTWAVE-TM Multi-Microphone Hybrid

FRONTWAVE^™ 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)
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
VB
11
5
2
GA3205
R5
R7
92K
460k
GP523
C3
100n
C4
100n
FRONT
MIC
6
GND2 7
REAR
MIC ¹²
GND1 ¹
10k
C1
200n
SW
36k
C2
200n
10k
-A
15k5
15k5
-B
10
8
SDA
MS
16k
26k
REGULATOR
3k9
-D
4 OUT
6k
25k
6k
26k
-C
11k
24k
R3
185k
C5
1n2
R4
R2
184k
45k5
R8
R9
92k 18k
C6
4n4
R6
185k
All resistors in ohms, all capacitors in farads unless otherwise stated.
BLOCK DIAGRAM
Revision Date: September 1999
Document No. 522 - 18 - 01
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone]
Web Site: www.gennum.com E-mail: [e-mail]