AGC-O with Active Low Cut Filter in a CIC Size Hybrid - GS3044 DATA SHEET DESCRIPTION • CIC suitable package size • low distortion compression limiting • 38dB maximum system gain, adjustable over a 38dB range • output compression threshold, adjustable over 16dB range • 2nd order active low cut filter adjustable from 530Hz to 2.0kHz • designed to drive a class D integrated receiver • averaging detector • flexibility to add high cut filter The GS3044 CIC hybrid features AGC-O capability for low distortion output limiting with an active low cut filter in a package size suitable for CIC instruments. The circuit consists of an AGC preamplifier and output stage, capable of driving a class D integrated receiver. The compression control circuit, connected between the input and output of the AGC preamplifier, varies the current controlled resistance. It operates with an 8:1 compression ratio and uses an averaging detector with a time constant of 270ms, selected to provide optimal sound quality over a full range of sound and listening environments. The actual attack and release times are typically 40ms and 150ms respectively when the circuit is fully in the compression region of operation (measured times vary depending on gain and threshold settings). The system gain, compression control and filter corner frequency can be adjusted by choosing three independent resistors or 100k trimmers. Maximum system gain is 38dB. It can be adjusted within a 38dB range. The output compression threshold can be adjusted within a 16dB range. The filter's corner frequency can be adjusted from 530Hz to 2kHz. STANDARD PACKAGING Hybrid typical dimensions: 0.180 x 0.110 x 0.070 in. (4.57 x 2.79 x 1.78 mm) VB RVC RTH 1 2 3 GS3044 C7 0µ15 REGULATOR 7 VREG C2 0µ1 8:1 COMPRESSION CONTROL 80k VB RECT. 48k C3 C1 IN C8 -F 6 6n8 15n C4 10n B -A 12k 10k 48k 33n 10 OUT 800 C5 0µ1 R1 = 0 5 RHP All resistors in ohms, all capacitors in farad, unless otherwidse stated. 8 FOUT C6 22n 9 AIN 4 GND Note: R1 can be desoldered from hybrid to break connection between FOUT and AIN BLOCK DIAGRAM Revision Date: March 2000 Document No. 521 - 90 - 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: [email protected] GS3044 FEATURES PAD CONNECTION GS3044 ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE Supply Voltage 3 VDC Power Dissipation 25 mW Operating Temperature Range -10° C to 40° C Storage Temperature Range -20° C to 70° C VB 1 OUT RTH GND RHP 2 3 4 5 10 9 CAUTION ELECTROSTATIC SENSITIVE DEVICES RVC AIN 6 IN 8 7 FOUT VREG DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION ELECTRICAL CHARACTERISTICS CONDITIONS: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage VB = 1.3 V PARAMETER SYMBOL Hybrid Current Minimum Voltage CONDITIONS MIN TYP MAX UNITS IA M P - 235 340 µA VB - - 1.1 V - 0.5 1.0 % VIN = -60dBV Total Harmonic Distortion THD Input Referred Noise IRN A weighted, RH P = 100kΩ System Gain at Peak AV Frequency = 2.8kHz, RH P = 100kΩ Relative Gain at Peak with Low Cut, Note 3 ∆AV - 4.4 - µVR M S 35 38 41 dB Frequency = 2.8kHz, RH P = 0 - -1.0 - dB - -3.0 - dB -27 -2 3 -19 dB - -3.0 - dB Relative Gain at 500Hz, Note 3 ∆ALF Frequency = 500Hz, RH P = 100kΩ Relative Gain at 500Hz with Low Cut, Note 3 ∆ALC Frequency = 500Hz, RH P = 0 Relative Gain at 5kHz, Note 3 ∆AH F Frequency = 5kHz, RH P = 100kΩ Regulator Voltage VR E G 890 935 1000 mV Power Supply Rejection Ratio PSRR 49 56 - dB AGC Maximum Threshold (O/P Referred) TH M A X VIN = -60dBV, Note 2 -43 -41 -39 dBV Minimum Threshold (O/P Referred) THM I N VIN = -70dBV, RTH = 100k, Note 2 -59 -57 -55 dB V VC Gain Range ∆AVC RV C = 100kΩ to 0Ω 35 38 41 dB Compression Ratio High Threshold CMP-H VIN = -60dBV to -30dBV, RTH = 0 8.0 9.0 10.0 ratio Compression Ratio Low Threshold CMP-L VIN = -70dBV to -40dBV, RTH = 100kΩ 6.5 7.3 9.0 ratio VIN = -70dBV 24 27 30 dB Note 1 47 53 55 dB τAG C - 270 - ms Gain AB - 11 - dB Output Resistance RO P - 24 - kΩ Minimum Corner Frequency ƒC _M I N - 530 - Hz Maximum Corner Frequency ƒC _M A X - 2 - kHz Stage A Gain Compression Gain Range AA AR A N G E AGC Time Consrtant OUTPUT STAGE FILTER All parameters and switches remain as shown in the Test Circuit unless otherwise stated in the CONDITIONS column. NOTE: 1. ARANGE = AA - AA[VIN = -20dBV, RTH = 100k] 2. Measured at output of Stage A 3. Relative to System Gain at Peak 521 - 90 -02 2 VB Rvc=100k RTH =0 1 3 2 GS3044 C7 0µ15 C2 0µ1 GS3044 REGULATOR 7 VREG 8:1 COMPRESSION CONTROL 80k VB RECT. 48k C3 C1 6n8 15n 10 B -A 12k 10k 48k 3k9 VIN VOUT C8 -F 6 C4 10n 33n 50k 800 C5 0µ1 R1 = 0 5 9 8 FOUT RHP 100k C6 22n 4 All resistors in ohms, all capacitors in farad, unless otherwidse stated. AIN Fig. 1 Production Test Circuit VB Rvc 100k (Log) 1 RTH 100k (Log) 2 3 GS3044 C7 0µ15 REGULATOR 7 C2 0µ1 8:1 COMPRESSION CONTROL VB 80k VB RECT. C1 15n 48k C3 6n8 6 B -A 12k 10k Any Knowles or Microtronic Microphone 2µ2 C8 -F 10 48k C4 10n 33n Any Knowles class D integrated receiver 800 C5 0µ1 C6 22n R1 = 0 5 8 RHP 100k (Log) 9 4 All resistors in ohms, all capacitors in farad, unless otherwidse stated. Fig. 2 Typical Application Circuit 3 521 - 90 - 02 7 MIC + R1 8 6 10 5 GS3044 9 4 3 2 RTH RHP 1 RVC - + + RECEIVER BATTERY 2µ2 Fig. 3 Typical Hearing Instrument Assembly Diagram 1.3V Rvc=100k 1 RTH =100k 2 3 GS3044 C7 0µ15 REGULATOR 7 C2 0µ1 8:1 COMPRESSION CONTROL 80k VB RECT. 48k C1 3k9 6 15n 6n8 -F B -A 10k 12k 800 C5 0µ1 C6 22n R1 = 0 5 8 RHP 100k 9 AIN 4 All resistors in ohms, all capacitors in farad, unless otherwidse stated. Fig. 4 Characterization Circuit (used to generate typical curves) 521 - 90 -02 10 48k C4 10n Pink Noise Generatoror 1kHz for I/O VOUT C8 C3 4 33n 50k -20 RVC = 100k 50k 25k 12.1k 4.75k 1.5k 0 RTH=0 -25 -30 RTH=25k OUTPUT (dBV) -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -140 RTH=0 VIN = 1kHz -35 -40 RTH=100k -45 -50 VIN =1kHz RVC = 100k -55 -60 -65 -120 -100 -80 -60 -40 -20 -70 -140 0 -120 -100 INPUT (dBV) -60 -40 -20 0 Fig. 6 Input vs Output Threshold Settings 45 45 RHP = 100kΩ RTH=0 40 40 RTH=25k RTH=50k 35 35 RTH=100k 30 30 25 GAIN (dB) GAIN (dB) -80 INPUT (dBV) Fig. 5 Input vs Output Volume Control Settings VIN = -70dBV RVC = 100k 20 RHP = 0 25 15 10 10 5 5 1k 100 VIN = -70dBV RVC = 100kΩ RTH = 0 20 15 0 GS3044 OUTPUT (dBV) TYPICAL PERFORMANCE CURVES 0 100 10k 1k FREQUENCY (kHz) 10k FREQUENCY (kHz) Fig. 7 Frequency Response vs RTH Fig. 8 Frequency Response vs RHF 10 6 5 THD (%) THD (%) VIN = 1kHz RVC = 100k RTH = 0 1 4 3 2 RTH = 100k VIN = -40dBV RVC = 100kΩ RTH = 0 1 RTH = 100kΩ 0.1 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 100 0 INPUT (dBV) 1k 10k FREQUENCY (kHz) Fig. 10 THD vs Frequency Fig. 9 THD vs Input 5 521 - 90 - 02 0.1 PACKAGE DIMENSIONS GS3044 XXXXXX IMD (%) RVC =100kΩ VIN =1kHz 0.110 (2.79) GS3044 RTH = 0 0.180 (4.57) 0.01 -80 -70 -60 -50 -40 -30 -20 -10 0 INPUT (dBV) 0.079 MAX (2.01) Fig. 11 Intermodulation distortion vs Input 1 2 3 C3 10 4 C1 5 6 10 9 RVC =100kΩ VIN -40dBV IMD (%) 1 0.01 3k 10k 8 C4 7 Dimensions are in inches. Dimensions shown in parenthesis are in millimeters, converted from inches and include minor rounding errors. 1.0000 inches = 25.400mm. Dimension tolerances ±0.003 (+0.08) unless otherwise stated. Minimum Pad size: 0.027 x 0.026in (0.68 x 0.71mm) XXXXXX - work order number. This hybrid is designed for point-to-point manual soldering. RTH = 0 0.1 R1 100k FREQUENCY (kHz) Fig. 12 Intermodulation Distortion vs Frequency DOCUMENT IDENTIFICATION: GENNUM CORPORATION 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. 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 REVISION NOTES: 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 Updated to Data Sheet; Correction to Figure 7. 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 September 1998 Gennum Corporation. All rights reserved. 521 - 90 -02 6 Printed in Canada.