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| High Power Class B Amplifier LC552 DATA SHEET FEATURES * operates over a supply range of 1.0 V to 3.0 V * selectable class B or vari-bias class A operation * feedback stabilized gain 80 dB * high power output > 140 dBSPL * independent preamplifier and output modules * minimum external parts count STANDARD PACKAGING * 14 pin DIP * 14 pin SOIC * Chip (50 x 52 mils) DESCRIPTION The LC552 is a versatile low voltage, high gain, high power output amplifier. It features a preamplifier module with adjustable gain and a unique power amplifier module that can be operated either as a high power, high efficiency class B amplifier, with very low quiescent current consumption, or as a medium power "vari-bias" class A amplifier. While designed specifically for use in body type hearing aids, the LC552 can be used in other applications where linear audio frequency amplification and frequency shaping is required. FEEDBACK 9 VCC 1 10 MIC BIAS 5 VCC 2 11 CURRENT TRIM 14 2.2K 470 12 OUTPUT B PREAMP I/P 6 PREAMP OUTPUT STAGE 3 OUTPUT A 7 PREAMP GND 8 PREAMP O/P 1 OUTPUT STAGE I/P 2 13 4 DEC DEC O/P A B GND All resistors in ohms, all capacitors in farads unless otherwise stated. BLOCK DIAGRAM Revison Date: July 1993. Document No. 500 - 58 - 6 GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 Japan Branch: A-302 M i yamae Vi l l age, 2-10-42 M i yamae, Sugi nami-ku, Tokyo 168, Japan tel. (905) 632-2996 fax: (905) 632-5846 tel. (03) 3334-7700 fax (03) 3247-8839 ABSOLUTE MAXIMUM RATINGS PIN CONNECTION PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature VALUE / UNITS 3V 200 mW -10 to + 60 oC -20 to + 70 oC OUTPUT STAGE I/P DEC A OUTPUT A O/P GND MIC BIAS 1 14 CURRENT TRIM DEC B OUTPUT B V CC2 VCC1 FEEDBACK 7 8 PREAMP O/P CAUTION CLASS 1 ESD SENSITIVITY PREAMP I/P PREAMP GND ELECTRICAL CHARACTERISTICS All parameters tested in Test Circuit Fig. 1. Conditions: Supply voltage VB= 1.3 V DC, Temperature ambient = 25C, Frequency = 1 kHz, Noise Filter Bandwidth at 12 dB/oct (0.2 to 10kHz) PARAMETER Gain Total Current Total Harmonic Distortion & Noise Input Referred Noise Stable with Battery Resistance to Input Impedance of Output Amplifier Frequency Response (-3 dB at 1 kHz) Gain Dependence on RB SYMBOL AV ITOT THD CONDITIONS Output = 0.707 VRMS MIN 72 - TYP 75 0.77 1.5 0.9 27 250 12 MAX 78 1.2 3.0 2.5 22 36 - UNITS dB mA % V k Hz kHz dB / Output = 0.707 VRMS 18 Low High - 0.02 RB 10 820 VI 20k 3k9 RIN RF 200k 8 1 220 VC 10k 01 2 01 6 5 9 14 11 12 10 N/C N/C 4.7 VB = 1.30 VDC VO LC552 10 13 4 3 7 01 RL= 470 1 kHZ HAMMOND 99966 01 01 10 10 10 All resistors in ohms, all capacitors in farads unless otherwise stated. NOTES: 1. Test Circuit Amplifier Gain = 20 Log10 ( VO / VI ) + 40 dB 2. Preamp Gain = RF RIN set at 35 dB Fig. 1 Test Circuit 500 - 58 - 6 2 MIC BIAS 5 2k2 VCC 2 11 2k7 470 OUTPUT A 3 15k VCC 1 10 DECOUPLED A 2 27k O/P STAGE I/P 1 CURRENT TRIM 14 600 O/P GND 4 8k2 FEEDBACK 9 3k5 5k6 PREAMP I/P 6 DECOUPLED B 13 7 PREAMP GND 8 PREAMP O/P 15k 2k7 OUTPUT B 12 PREAMP STAGE All resistors in ohms, all capacitors in farads unless otherwise stated. O/P STAGE Fig. 2 Functional Schematic Diagram VB = 1.30 VDC 10 N/C N/C MIC 01 220k 6 5 9 14 11 12 RECEIVER 400 IMPEDANCE LC552 8 1 2 10 13 4 3 7 01 10k 01 01 01 68 10 68 All resistors in ohms, all capacitors in farads unless otherwise stated. DOCUMENT IDENTIFICATION Fig. 3 Typical Hearing Aid Circuit PRODUCT PROPOSAL This data has been compiled for market investigation purposes only, and does not constitute an offer for sale. ADVANCE INFORMATION NOTE This product is in development phase and specifications are subject to change without notice. Gennum reserves the right to remove the product at any time. Listing the product does not constitute an offer for sale. PRELIMINARY DATA SHEET The product is in a preproduction phase and specifications are subject to change without notice. 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: SOIC package added. 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 1989 Gennum Corporation. All rights reserved. Printed in Canada. 3 500 - 58 - 6 |
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