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| High Power Class B Output Stage LC551 DATA SHEET FEATURES * adjustable gain to 48 dB * capable of driving low impedance receiver (110 ) * low parts count, 3 small capacitors & 1 resistor * gain trim can be used as volume control for reduced noise * minimal start - up transient DESCRIPTION The LC551 is a 10 pin low voltage, class B amplifier which operates over a battery voltage range of 1.1 V DC to 3 V DC. * frequency bandwidth of 18 kHz STANDARD PACKAGING * 10 pin PLID (R) * Chip (80 x 61 mils) D E DS NN EG M SI ME OD C EW RE TN OR NO F VB 6 10 AIN 5 O/P2 The LC551 consists of three gain blocks. The first block is an inverting amplifier with the gain set by two external resistors. This gain trim feature can be used as a volume control in hearing aid applications. The second block is an inverting unity gain amplifier which serves as a phase splitter. The outputs from the first and second blocks drive the differential inputs of the third block. The third block has a fixed AC gain of 28 dB when driving a receiver. This amplifier has internal compensation eliminating the need for a capacitor across the receiver. Two ground pins are available for "star " grounding to reduce any second harmonic distortion produced by ground line resistance. -A -B C 1 O/P1 AOUT 4 REFERENCE VOLTAGE 2 GND 1 9 GND 2 7 8 3 REF DEC2 DEC1 U.S. Patent No. 4,719,430, other patents pending. BLOCK DIAGRAM Revision Date: January 2001 Document No. 500 - 77 - 5 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 PIN CONNECTION PARAMETER Supply Voltage Operating Temperature Range Storage Temperature Range VALUE/UNITS 5V -10 C to 40 C -20 C to 70 C A A IN TOP VIEW 5 6 V V B OUT REF DEC1 GND1 DEC2 GND2 1 10 O/P2 CAUTION CLASS 1 ESD SENSITIVITY O/P1 ELECTRICAL CHARACTERISTICS All switches remain as shown in Test Circuit unless stated in condition column Conditions: Supply voltage V B= 1.3 V DC, Temperature ambient = 25C, Noise Filter Bandwidth at 12 dB/Oct (0.2 to 10 kHz) PARAMETER Gain Gain Expansion Quiescent Current: Amplifier Transducer Total Input Referred Noise SYMBOL AV CONDITIONS MIN 46 TYP 48 210 220 430 1.3 1.2 3 22 MAX 50 3 335 405 740 2.5 2.5 5.2 - UNITS dB dB A A Ouput Level 1.3 VRMS IAMP ITR ITOT VIN = 0 (S1 - A) Output Level 0.707 VRMS 120 120 240 - V % % Total Harmonic Distortion Stable with battery resistance to THD Output Level 1.3 VRMS - NOTES: 1. Gain expansion = Gain (at 1.3 VRMS output) - Gain (at 0.707 VRMS output) 2. Output impedance is typically 8 with VOUT = 0.5 VRMS RB = 4.7 6 VB 0.1 + RS 10K 5 10 Vo -A -B C RL = 400 1 HAMMOND 99966 S1 a b RVC 100K 4 VIN 1kHz 2 GROUND 1 GROUND 2 0.047 9 7 8 3 REFERENCE VOLTAGE All resistors in ohms, all capacitors in F unless otherwise stated 0.047 Fig. 1 Test Circuit 2 500 - 77 - 5 14 13 POWER OUTPUT (mW) 12 11 10 9 8 7 6 5 4 3 0 200 400 600 800 1k RESISTANCE () Fig. 2 Power Output vs Load Resistance at 7% Distortion RB = 0 VB = 1.35 V VB 1.3 V DC 4.7 3 4 2 0.1 1 1.0 6 0.1 10K 50K 4 2 0.047 8 5 6 10 MIN 110 RECEIVER IMPEDANCE LC506 5 LC551 3 7 9 1 0.047 All resistors in ohms, all capacitors in F unless otherwise stated. Fig. 3 Typical Hearing Aid Application 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. REVISION NOTES: Changes to standard packaging information. 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 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 November1984 Gennum Corporation. All rights reserved. Printed in Canada. 500 - 77 - 5 This datasheet has been download from: www..com Datasheets for electronics components. |
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