High Power Class B Amplifier LC552 DATA SHEET FEATURES DESCRIPTION • operates over a supply range of 1.0 V to 3.0 V The LC552 is a versatile low voltage, high gain, high power output amplifier. • selectable class B or vari-bias class A operation • feedback stabilized gain ≤ 80 dB 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. • high power output > 140 dBSPL • independent preamplifier and output modules • minimum external parts count 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. STANDARD PACKAGING • 14 pin DIP • 14 pin SOIC • Chip (50 x 52 mils) VCC 1 FEEDBACK 9 10 MIC BIAS VCC 2 CURRENT TRIM 5 11 14 2.2K 470 12 PREAMP I/P 6 OUTPUT STAGE PREAMP 3 7 PREAMP GND OUTPUT B 8 PREAMP O/P 1 OUTPUT STAGE I/P 2 13 OUTPUT A 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. 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 Document No. 500 - 58 - 6 tel. (905) 632-2996 fax: (905) 632-5846 tel. (03) 3334-7700 fax (03) 3247-8839 PIN CONNECTION ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE / UNITS Supply Voltage OUTPUT STAGE I/P 3V Power Dissipation DEC A 200 mW Operating Temperature -10 to + 60 oC Storage Temperature -20 to + 70 oC 14 1 DEC B OUTPUT A OUTPUT B O/P GND V CC2 MIC BIAS VCC1 FEEDBACK PREAMP I/P CAUTION 7 PREAMP GND CLASS 1 ESD SENSITIVITY CURRENT TRIM 8 PREAMP O/P ELECTRICAL CHARACTERISTICS All parameters tested in Test Circuit Fig. 1. Conditions: Supply voltage VB= 1.3 V DC, Temperature ambient = 25°C, Frequency = 1 kHz, Noise Filter Bandwidth at 12 dB/oct (0.2 to 10kHz) PARAMETER SYMBOL MIN TYP MAX UNITS 72 75 78 dB - 0.77 1.2 mA - 1.5 3.0 % Input Referred Noise - 0.9 2.5 µV Stable with Battery Resistance to - - 22 Ω Input Impedance of Output Amplifier 18 27 36 kΩ Gain AV Total Current ITOT Total Harmonic Distortion & Noise THD CONDITIONS Output = 0.707 VRMS Output = 0.707 VRMS Frequency Response (-3 dB at 1 kHz) Low - 250 - Hz High - 12 - kHz 0.02 - dB / Ω - Gain Dependence on RB RB 4.7 10µ 10µ VB = 1.30 VDC N/C N/C 9 14 820 VI VO 0µ1 3k9 20k 6 5 11 RIN LC552 RF 200k 1 kHZ 8 1 220 VC 10k 0µ1 10 2 13 4 0µ1 0µ1 10µ 10µ set at 35 dB RIN Fig. 1 Test Circuit 500 - 58 - 6 3 7 HAMMOND 99966 10µ NOTES: 1. Test Circuit Amplifier Gain = 20 Log10 ( VO / VI ) + 40 dB RF RL= 470 Ω 0µ1 All resistors in ohms, all capacitors in farads unless otherwise stated. 2. Preamp Gain = 12 2 MIC BIAS 5 VCC 2 2k2 11 2k7 OUTPUT A 3 15k 470 VCC 1 10 3k5 8k2 DECOUPLED A 2 5k6 FEEDBACK 9 27k O/P STAGE I/P 1 PREAMP I/P 6 CURRENT TRIM 14 7 PREAMP GND O/P GND 4 600 DECOUPLED B 13 8 PREAMP O/P OUTPUT B 12 15k 2k7 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 10µ MIC 6 5 N/C N/C 9 14 11 0µ1 12 LC552 220k 8 1 10 2 0µ1 13 4 RECEIVER 400Ω IMPEDANCE 3 7 10k 0µ1 0µ1 0µ1 6µ8 10µ 6µ8 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. © Copyright 1989 Gennum Corporation. All rights reserved. Printed in Canada. 3 500 - 58 - 6