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| www..com AGC-O in a CIC Size Hybrid GS3026 - DATA SHEET FEATURES * CIC suitable package size 8:1 compression ratio 38 dB maximum system gain, adjustable over a 38 dB range output compression threshold, adjustable over 16 dB range designed to drive a class D integrated receiver averaging detector DESCRIPTION The GS3026 CIC hybrid features AGC-O capability for low distortion output limiting and offers a package size suitable for CIC instruments. The circuit consists of a newly designed AGC preamplifier and output stage, capable of driving the class D integrated receiver. The compression control circuit varies the current controlled resistance, connected between the input and output of the AGC preamplifier. The compression circuit operates with an 8:1 compression ratio and uses an averaging detector with a time constant of 270 ms, selected to provide optimal sound quality over the full range of sound and listening environments. The actual attack and release times are typically 40 ms and 150 ms respectively when the circuit is fully in the compression region of operation (measured times will vary depending on gain and threshold settings). The system gain and compression control can be adjusted by the choice of two independent resistors. Maximum system gain is 38 dB and it can be adjusted within a 38 dB range. The output compression threshold can be adjusted within a 16 dB range. * * * * * STANDARD PACKAGING Hybrid typical dimensions: 0.162 in x 0.094 in x 0.070 in (4.11 mm x 2.39 mm x 1.78 mm) VB 1 Rvc 4 RTH 6 C3 015 GS3026 VREG 3 C1 01 REG. 8:1 COMPRESSION CONTROL RECT. VB 48k C4 C2 IN 2 01 GND 7 C5 22n All resistors in ohms, all capacitors in farads unless otherwise stated. -A 12k B 48k 33n 5 OUT BLOCK DIAGRAM Revision Date: July 1998 Document No. 521 - 71 - 02 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 www..com ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage VALUE / UNITS 3 VDC 25 mW -10 C to 40 C -20 C to 70 C 2 1 VB PAD CONNECTION GND 3026 Power Dissipation Operating Temperature Range Storage Temperature Range 7 6 3 4 5 CAUTION CLASS 1 ESD SENSITIVITY IN VREG RVC OUT RTH ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C, Supply Voltage VB = 1.3 V PARAMETER Hybrid Current Minimum Voltage Total Harmonic Distortion Input Referred Noise Total System Gain Regulator Voltage Power Supply Rejection Ratio AGC Maximum Threshold (Output Referred) Minimum Threshold (Output Referred) VC Gain Range Compression Ratio High Threshold Compression Ratio Low Threshold SYMBOL I AMP VB THD IRN AV VREG PSRR CONDITIONS MIN - TYP 165 1.1 0.5 2 38 950 57 MAX 240 1 2.5 41 1000 - UNITS A V % VRMS dB mV dB V IN=-60dBV A weighted V IN=-70dBV 35 890 49 THMAX THMIN AVC CMP-H CMP-L AA ARANGE V IN=-60dBV Note 2 V IN=-70dBV RTH = 200k Note 2 RVC =200k to 0 V IN=-60dBV to -30dBV RTH=0 V IN=-70dBV to -40dBV RTH=200k V IN=-70dBV RTH =200k; Note 1 -43 -41 -39 dBV -59 -57 -55 dBV 35 8 6.5 24 47 - 38 9.0 7.3 27 50 270 41 10 9 30 55 - dB ratio ratio dB dB ms Stage A Gain Compression Gain Range AGC Time Constant OUTPUT STAGE Gain Output Resistance AGC AB 9 20 11 24 13 28 dB k All parameters and switches remain as shown in the Test Circuit unless otherwise stated in CONDITIONS column. Note 1. A = AA -A A [VIN = -20dBV] RANGE 2. Measured at output of Stage A 521 - 71 - 02 2 www..com VB Rvc=200k 1 4 6 RTH =0 C3 015 GS3026 3 C1 01 REG. 8:1 COMPRESSION CONTROL RECT. VB 48k VOUT 5 50k C2 VIN 3k9 7 C5 22n All resistors in ohms, all capacitors in farads unless otherwise stated. 2 01 12k -A B 48k C4 33n Fig. 1 Production Test Circuit VB Rvc 1 4 6 C3 015 RTH GS3026 3 C1 01 REG. 8:1 COMPRESSION CONTROL VB RECT. VB 48k C4 -A B 48k 33n 22 5 Any Knowles class D integrated receiver C2 2 Any Knowles or Microtronic Microphone 01 7 C5 22n All resistors in ohms, all capacitors in farads unless otherwise stated. 12k Fig. 2 Typical Hearing Instrument Application 3 521 - 71 - 02 3026 www..com 3026 1 2 Fig. 3 Typical Hearing Instrument Assembly Diagram 1.3V Rvc=200k 1 4 4 6 C3 015 RTH =200k GS3026 3 C1 01 REG. 8:1 COMPRESSION CONTROL RECT. VB 48k C4 VOUT 5 48k 33n 50k C2 2 3k9 7 PINK NOISE GENERATOR or 1kHz for I/O 01 12k -A B C5 22n All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 4 Characterization Circuit (used to generate Typical Curves) 521 - 71 - 02 4 + + MIC 3 - + BATTERY RVC RTH 7 4 5 6 22 REC www..com -15 -25 -35 RVC=200k 100k 50k 25k 10k 3.3k 0 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 RTH= 0 VIN=1kHz -70 -75 -120 -100 -80 -60 -40 -20 0 -80 -140 -120 -100 -80 -60 -40 -20 0 VIN=1kHz RVC= 200k RTH= 0 50k 200k OUTPUT (dBV) OUTPUT (dBV) -45 -55 -65 -75 -85 -95 -140 INPUT (dBV) INPUT (dBV) Fig. 5 Input vs Output Volume Control Settings Fig. 6 Input vs Output Threshold Settings 40 1000 RTH= 0 AMPLIFIER CURRENT (A) 35 RTH= 0 VIN=1kHz GAIN (dB) 30 RTH=50k 25 RTH=200k 500 400 300 RVC = 0 20 RVC= 200k VIN=-70dBV 15 200 RVC= 200k 10 20 100 1k 10k 20k 100 -140 -120 -100 -80 -60 -40 -20 0 FREQUENCY (kHz) INPUT (dBV) Fig. 7 Frequency Response vs RTH Fig. 8 Amplifier Current vs RVC 1000 VIN=1kHz RVC=200k 500 10 AMPLIFIER CURRENT (A) VIN=1kHz RVC=200k RTH = 200 50k 0 THD (%) 400 300 1 RTH=0 200 RTH= 200k 0.1 100 -140 -120 -100 -80 -60 -40 -20 0 0.04 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 INPUT (dBV) INPUT (dBV) Fig. 9 Amplifier Current vs RTH Fig. 10 THD vs Input 5 521 - 71 - 02 3026 www..com 5 4.5 4 VIN=-40dBV RVC=200k 10 3026 VIN=1kHz RVC=200k 1 3.5 THD (%) 3 2.5 RTH =0 2 1.5 1 0.5 0 100 RTH= 200k IMD (%) RTH=0 0.1 1k 10k 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 FREQUENCY (Hz) INPUT (dBV) Fig. 11 THD vs Frequency Fig. 12 Intermodulation Distortion vs Input 10 VIN=-40dBV RVC=200k 1 IMD (%) RTH=0 0.1 0.01 3k 10k 100k FREQUENCY (Hz) Fig. 13 Intermodulation Distortion vs Frequency 521 - 71 - 02 6 www..com 0.162 (4.11) 0.094 (2.39) C3 0.075 MAX (1.91) 1 C1 C5 C4 7 2 6 3 4 5 Dimensioning units are inches. Dimensions shown in parenthesis are in millimetres, converted from inches and include minor round off errors. 1.0000 inches = 25.400mm. Dimension tolerances 0.003 (+0.08) unless otherwise stated. Pad numbers and capacitor numbers for illustration only. Smallest pad sizes 0.024 x 0.023 (0.61 x 0.58). Largest pad size 0.020 x 0.040 (0.51 x 1.02). XXXXXX - work order number. This hybrid is designed for point to point manual soldering. For more information contact Gennum Corporation. Fig. 14 Hybrid Layout and Dimensions DOCUMENT IDENTIFICATION: DATA SHEET The product is in production. Gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. REVISION NOTES: Updated to Data sheet, corrections to THMAX and THMIN 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 August 1996 Gennum Corporation. All rights reserved. Printed in Canada. 7 521 - 71 - 02 3026 C2 XXX XXX |
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