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| High Gain Class A Amplifier with Peak Clipping LS505 DATA SHEET FEATURES * 72 dB typical gain * 0.2 to 2.0 mA of transducer current adjustment * 43 dB range of feedback volume control * 1.0 to 1.6 V supply operating range * Schottky diodes provide symmetrical peak clipping * requires only 4 external parts for operation STANDARD PACKAGING * 8 pin MINIpac * 8 pin MICROpac * 8 pin PLID(R) * 8 pin SLT * Chip (56 x 55 mils) DESCRIPTION The LS505 is a low voltage, monolithic integrated circuit amplifier comprised of an operational amplifier driving a single transistor Class A output stage with open collector. Also included are a pair of complementary Schottky diodes which provide the capability for symmetrical peak clipping in a feedback configuration. An internal negative feedback loop ensures a stable operating point for the output stage over the designed operating voltage. This also permits trimming of the output current with the use of a single external resistor. The input stage and microphone are biased by an internal 2.2 k decoupling resistor to increase battery line signal rejection. VMIC 8 VB 4 MPO 1 2.2k I/P + 100 RVC 5 7 GND 33k O/P 3 6 200 2 RE BLOCK DIAGRAM All resistors in ohms, all capacitors in farads unless otherwise stated. Revision Date: January 1996 Document No. 500 - 20 - 11 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, Suginami-ku Tokyo 168, Japan tel. (905) 632-2996 fax: (905) 632-5946 tel. (03) 3334-7700 fax (03) 3247-8839 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power dissipation Operating Temperature Storage Temperature VALUE & UNITS 3V 25 mW -10 to +40 C -20 to +70 C PIN CONNECTION V B O/P R E MPO 4 5 R VC I/P GND 1 8 V MIC CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions: Temperature 25 o C, Supply Voltage VB = 1.55 VDC PARAMETER Gain Temperature Coefficient of Gain Amplifier Current Temperature Coefficient of Current Transducer Current Total Harmonic Distortion Input Referred Noise Battery Resistance Stability Volume Control Range Input Impedance (Pin 6) Frequency Response (-3 dB) SYMBOL ACL A IAMP ITRANS THD IRN CONDITION VO = 0.707 VRMS MIN 68 180 1.3 TYP 72 0.07 210 -0.002 1.5 2 1.2 43 27 100 5K 0.19 0.16 42.5 MAX 76 280 1.9 5 2.0 22 0.275 - UNITS dB dB/oC A mA/oC mA % VRMS dB k Hz Hz VRMS dB/ mV VO = 0.707 VRMS NFB 0.2 to 10 kHz at 12 dB/oct RB = 22 RVC = 100 to 100.1 k S1 open 36 - RIN Low High 0.125 - Maximum Output Gain Dependence of RB Emitter Bias Voltage (Pin 2) VRE S2 closed - All switches and parameters remain as shown in test circuit unless stated in condition column 500 - 20 - 11 2 RB = 4.7 VB = 1.5 VDC 10 + + VO 10 S2 1k 8 RS 3.9k 0.033 + 6 S1 100 100k + 10 100 5 2.2k 4 1 3 IL 33k 200 7 2 RE 33 All resistors in ohms, all capacitors in F unless otherwise stated Fig. 1 Test Circuit VB 4 2.2k MPO VMIC 8 30k 27k OUTPUT INPUT 6 100 33k 2 RE 3 1 VOLUME CONTROL 200 5 GND 7 All resistors in ohms, all capacitors in farads unless otherwise stated U.S. Patent No. 4,034,306 - Patented in other countries Fig. 2 Functional Schematic 3 500 - 20 - 11 CMPO + 10 1.0 8 2.2k 6 0.033 100 RVC 100k 5 33k 200 4 1 RMPO 10k V =1.35VDC B 1k 3 + LS505 LS505 + 10 7 2 R E 56 All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 3 Typical Hearing Aid Applications 47 46 7 6 5 4 VOLUME CONTROL RANGE (dB) 45 44 43 42 41 40 10 gm ( 50 100 500 1k 5k 10k ) 3 2 1 0 10 50 100 500 1k 5k 10k EXTERNAL RESISTANCE () RE Fig. 5 GM vs RE Fig. 4 Volume Control Range vs RE 3.5 3.0 130 DIODES DISCONNECTED 120 LOAD CURRENT I (mA) 2.5 OUTPUT (dBSPL) 50 100 500 1k 5kk 10k L 2.0 1.5 1.0 0.5 0 10 110 100 90 80 30 40 50 60 70 80 90 100 110 EXTERNAL RESISTANCE RE () INPUT (dBSPL) Fig. 6 Load Current vs External Resistance Fig. 7 I/O Characteristics 500 - 20 - 11 4 0 6 RELATIVE VOLTAGE GAIN (dB) -10 RELATIVE VOLTAGE GAIN (dB) 10 100 1k 10k 5 -20 4 -30 3 -40 2 -50 1 1 10 100 R VC () BATTERY RESISTANCE R () B Fig. 8 Relative Voltage Gain vs Volume Control Resistance Fig. 9 Relative Voltage Gain vs Battery Resistance 250 2.5 AMPLIFIER CURRENT (A) 150 LOAD CURRENT I (mA) 200 2.0 L 1.5 1.0 0.5 0 100 50 0 0.8 1.0 1.2 1.4 1.6 1.8 0.8 1.0 1.2 1.4 1.6 1.8 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) Fig. 10 Amplifier Current vs Supply Voltage Fig. 11 Load Current vs Supply Voltage 74 72 GAIN (dB) 70 68 66 64 0.8 1.0 1.2 1.4 1.6 1.8 SUPPLY VOLTAGE (V) Fig. 12 Gain vs Supply Voltage REVISION NOTES Au bump removed 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 October 1977 Gennum Corporation. All rights reserved. Printed in Canada. 5 500 - 20 - 11 |
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