GA3205

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 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 + 40°C -20 to +70°C 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 5 VREG2 4 OUT 3 2 VB 1 GND1 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 µA V mV dB dB dB dB µs µs dB dB % µV kΩ 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) 522 - 18 - 01 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 3 522 - 18 - 01 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 10k -A 10µ 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) 522 - 18 - 01 4 TYPICAL PERFORMANCE CURVES 20 R6 - Tap 15 15 VIN = -40 dBV 35 10 DELAY OF STAGE C (µs) 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 5 522 - 18 - 01 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. thinSTAX™ 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. © Copyright April 1999 Gennum Corporation. All rights reserved. Printed in Canada. 522 - 18 - 01 6