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FRONTWAVETM 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 thinSTAXTM PACKAGING Hybrid Typical Dimensions: 0.205 x 0.110 x 0.060in. (5.21 x 2.79 x 1.52mm) DESCRIPTION
GA3205
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 R7 460k C3 100n
VB 2 GA3205
R5 92K
GP523 C4 100n
REGULATOR FRONT MIC 6 10k -A C1 200n 3k9 SW 36k 15k5 REAR MIC 12 C2 200n 10k 6k 25k 26k -C 6k 15k5 -D 4 OUT 16k 26k
GND2 7
-B
11k
24k
GND1 1 C5 1n2 R3 185k R4 184k R2 45k5 R8 92k R9 18k
C6 4n4 R6 185k
10 SDA
8 MS
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. +1 (905) 632-2996 Web Site: www.gennum.com E-mail: hipinfo@gennum.com
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Power Dissipation Operating Temperature VALUE
PAD CONNECTION
GND2 MS 8 9 SDA 10 VREG1 11
2VDC
7
25mW -10 to + 40C -20 to +70C
5 VREG2 4 OUT 3 2 VB 1 GND1 FRONT MIC 6 13 12 REAR MIC
GA3205
Storage Temperature CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION
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
PARAMETER H y b r i d C u r re n t Minimum Voltage Regulator Voltage Nominal System Gain M a x i m u m L o w F re q u e n c y B o o s t F ro n t C h a n n e l G a i n A d j u s t m e n t R a n g e Rear Channel Gain Adjustment Range Minimum Time Delay Maximum Time Delay Power Supply Rejection Ratio of System Power Supply Rejection Ratio of Regulator Total Har monic Distor tion I n p u t R e f e r re d N o i s e Output Resistane
SYMBOL IA M P VB VR E G GAIN @ 100Hz GFR O N T GR E A R
CONDITIONS
MIN 140 860 18 -
TYP 25 0 1.1 92 0 0 20 8 22 7.2 33. 0 50 70 0.1 3. 5 3.9
MAX 400 980 22 10 45 1.0 -
UNITS A V mV dB dB dB dB s s dB dB % V k
tM IN tM A X
PSRRS Y S PSRRR E G THD IRN RO P
R2 - Tap 0 R2 - Tap 0, R4 - Tap 15
4.5 25 -
SW = closed, R7 - Tap 13
-
(All conditions and parameters remain as shown in test circuit unless stated in condition column)
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2
VREG1 VREG2 11 5 R7 460k C3 100n
VB 2 GA3205
R5 92K
GP523 C4 100n
3k9
FRONT MIC
REGULATOR 6 C1 200n 7 SW 36k 15k5 6k 26k -C 3k9 15k5 -D 4 10k -A 16k 26k
GA3205
GND2
200n
VOUT
10k
3k9
12
REAR MIC
GND1
C2 200n
10k
-B
6k
25k
11k
24k
1 C5 1n2 R3 185k R4 184k R2 45k5 R8 92k R9 18k
C6 4n4 R6 185k
10 SDA
8 MS
All resistors in ohms, all capacitors in farads unless otherwise stated.
Fig. 1 Production Test Circuit
VB VREG1 VREG2 11 5 R7 460k C3 100n C4 100n 2 GA3205 R5 92K GP523
FRONT MIC
REGULATOR 10k -A C1 200n 16k 26k
6
7 GND2 SW 36k
3k9 15k5 -D 4 Any AC-Coupled Amplifier or Signal Processor
15k5 REAR MIC 12 12 C2 200n 10k 6k 25k 26k
6k
-B
11k -C
24k
GND1
1 C5 1n2 R3 185k R4 184k R2 45k5 R8 92k R9 18k
C6 4n4 R6 185k
10 SDA
8 MS
All resistors in ohms, all capacitors in farads unless otherwise stated.
Fig. 2 Typical Hearing Instrument Application
3
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BATTERY To Programmer Box
+
GA3205
FRONT MIC +
7
8
9
10
11
+REAR
MIC
6
13
12
5
4
3
2
1
Any AC-Coupled Amplifier or Signal Processor
Fig. 3 Typical Hearing Instrument Assembly Diagram
VREG1 VREG2 11 5 R7 460k C3 100n
VB 2 GA3205
R5 92K
GP523 C4 100n
REGULATOR 3k9 6 FRONT MIC GND2 7 SW 36k 15k5 3k9 C2 200n 10k 6k 25k 26k -C 6k C1 200n 3k9 15k5 -D 4 10k 10 10k -A VOUT 16k 26k
12 REAR MIC GND1 1
-B
11k
24k
C5 1n2 R3 185k R4 184k R2 45k5 R8 92k R9 18k
C6 4n4 R6 185k
10 SDA
8 MS
All resistors in ohms, all capacitors in farads unless otherwise stated.
R1 - Tap 15 R2 - Tap 15 R3 - Tap 0 R4 - Tap 0
R5 - Tap 0 R6 - Tap 0 R7 - Tap 3 R8 - Tap 14
Fig. 4 Characterization Circuit (used to generate typical curves)
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4
TYPICAL PERFORMANCE CURVES
20 R6 - Tap 15 15 VIN = -40 dBV
35
10
DELAY OF STAGE C (s)
30
25
GAIN (dB)
5
20
GA3205
0
R6 - Tap 0
15
-5
10
-10
20
100
1k
10k
20k
5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FREQUENCY (Hz)
R4 RESISTOR TAPS
Fig. 5 Frequency Response for Different R6 Tap Settings (Front Channel)
Fig. 6 Stage C Time Delay Adjustment
5
VIN = -40 dBV R8 - Tap 0 R3 & R4 - Tap 0
-20 f = 1 kHz -30 FRONT CHANNEL: R7 - Tap 0 R7 - Tap 24
OUTPUT LEVEL (dBV)
0
-40 -50 -60 -70 -80
GAIN (dB)
R8 - Tap 14 -5
R3 & R4 - Tap 15
REAR CHANNEL: R8 - Tap 0 R8 - Tap 24
R8 - Tap 24 -10
-15 100
1k
10k
-90 -100
-90
-80
-70
-60
-50
-40
-30
-20
FREQUENCY (Hz)
INPUT LEVEL (dBV)
Fig. 7 Frequency Response (Rear Channel)
Fig. 8 I/O Transfer Function for Front and Rear Channels
1
VIN = -40 dBV
10
f = 1 kHz
THD & NOISE (%)
THD & NOISE (%)
1
0.1
REAR CHANNEL FRONT CHANNEL
0.1
FRONT CHANNEL REAR CHANNEL
0.01 100
1k
10k
0.01 -80
-70
-60
-50
-40
-30
-20
FREQUENCY (Hz)
INPUT LEVEL (dBV)
Fig. 9 THD and Noise vs Frequency
Fig. 10 THD and Noise vs Input Level
5
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PACKAGE DIMENSIONS 0.205 (5.21)
GA3205
0.110 (2.79)
GA3205 XXXXXX
0.065 MAX (1.65)
1 2 12
3
4
5
13 10
6
11
9
8
7
Dimensions are in inches. Dimensions in parenthesis are in millimetres, converted from inches and include minor rounding errors. 1.0000 inches = 25.400mm. Dimension tolerances 0.003 ( 0.08) unless otherwise stated. Smallest pad 0.026 x 0.035 (pad 1). Largest pad 0.025 x 0.053 (pad 2). XXXXXX - work order number. This hybrid is designed for either point-to-point manual soldering or it can be reflowed according to Gennum's recommended reflow process (Information Note 521-45).
GENNUM CORPORATION
MAILING ADDRESS: P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814 SHIPPING ADDRESS: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5
DOCUMENT IDENTIFICATION: PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications are subject to change without notice.
GENNUM JAPAN CORPORATION
C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839
REVISION NOTES:
Cosmetic changes. thinSTAXTM notation added. Change to max. supply voltage.
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. (c) Copyright April 1999 Gennum Corporation. All rights reserved.
Printed in Canada.
522 - 18 - 01
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