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| GENNUM C O R P O R A T I O N High Gain Class A Amplifier LC505/LD505 DATA SHEET FEATURES * 71 dB of gain with 1.3 V supply * 0.2 to 2.0 mA of transducer current adjustment * 43 dB of volume control range DESCRIPTION The LC/LD505 are low voltage, linear monolithic integrated amplifiers with a typical electrical gain of 71 dB. The circuits are comprised of a compensated, unconditionally stable, operational amplifier and a low distortion Class A single transistor output stage with negative feedback for stability over a wide temperature range. Current trimming in the output stage for inductive or resistive loads can be accomplished by connecting an emitter resistor from RE to ground. The LC/LD505 can operate over a supply voltage range of 1.0 to 1.6 DC. The LD505 which is an eight pin device, has an internal 2.2 k decoupling resistor for microphone bias providing increased supply line rejection. The base of the output transistor is also accessible allowing connection of diodes in a feedback configuration for peak limiting. * 1.0 to 1.6 V supply operating range * 2.2 k internal decoupling resistor for microphone bias (LD505 only) * output limiting capabilities (LD505 only) STANDARD PACKAGING * MINIpac P6 (LC505) * MINIpac P8 (LD505) D E DS NN EG M SI ME OD C EW RE TN OR NO F VB MICBIAS 8 VB LIMITER 1 3 4 2 IN + OUT IN 2.2k 3 + OUT 5 6 - - 33k 33k VC 100 VC 100 5 7 GND All resistors in ohms, all capacitors in microfarads unless otherwise stated 4 6 GND 200 1 RE 200 2 RE All resistors in ohms, all capacitors in microfarads unless otherwise stated LC505 BLOCK DIAGRAM LD505 BLOCK DIAGRAM Revision Date: January 1996 Document No. 500 - 15 - 09 500 - 15 - 09 1 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) 632-5946 tel. (03) 3334-7700 fax (03) 3247-8839 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Operating Temperature Power dissipation VALUE & UNITS 3V -10 to +40 C 25 mW OUT PIN CONNECTION VB 3 4 VC IN RE 1 6 GND LC505 CAUTION CLASS 1 ESD SENSITIVITY V B OUT R E LIMITER 4 5 VC IN GND 1 8 MIC BIAS LD505 ELECTRICAL CHARACTERISTICS All switches remain as shown in test circuit unless stated in condition column Conditions: Temperature 25 o C, V = 1.55 V cc PARAMETER Gain Temperature Coefficient of Gain Amplifier Current Temperature Coefficient of Current Transducer Current SYMBOL AV A IA I L CONDITIONS MIN 68 TYP 72 71 0.07 0.21 0.16 -0.002 1.5 1.3 2 1.2 8 27 100 5000 43 42 MAX 76 76 0.28 0.23 1.9 1.7 5 6 2.0 - UNITS dB dB dB/oC mA mA mA/ oC mA mA % % VRMS k k Hz Hz dB dB VCC = 1.3 V 66 - Vcc = 1.3 V 1.3 Vcc = 1.3 V 1.0 - Total Harmonic Distortion Vcc = 1.3 V Input Referred Noise Battery Resistance Stability Input Impedance Bandwidth at 12 dB/OCT - 0.2 to 10 kHz 22 36 34 RVC = 100k (S1-open) LC505 LD505 Low Frequency Response (-3 dB) High R VC = 0 to 100k Volume Control Range (S1 - closed/open) R VC = 0 to 100k (S1 - closed/open) Vcc = 1.3 V LC505 - -0.4 +0.16 - dB/ dB/ Gain Dependance of RB LD505 500 - 15 - 09 2 IA RB = 4.7 VB = 1.5 VDC VO 3 1k RS 3.9k 0.33 5 2 + 1kHz S1 4 + 100k 10 100 200 6 1 RE 33 33k IL All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 1 LC505 Test Circuit VB = 1.5 VDC VO 8 2.2k RS 3.9 0.033 6 3 + 1kHz S1 5 + 100k 10 100 7 100 200 2 RE 33 33 k IL 4 1 1k 10 + IA RB = 4.7 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 2 LD505 Test Circuit VB 2.2k MIC BIAS (LD ONLY) 30k 27k OUTPUT INPUT 100 33k RE LIMITER (LD ONLY) VOLUME CONTROL 200 GND All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 3 Equivalent Circuit 3 500 - 15 - 09 I (mA) L IL (A) 3 200 2 100 1 0 10 100 RE () 1k 10k 0.8 1.0 1.2 VB (V) 1.4 1.6 1.8 Fig. 4 Load Current vs Emitter Resistor Fig. 5 Amplifier Current vs Supply Voltage IL (mA) AV (dB) 74 2 72 70 1 68 66 0 0.8 1.0 1.2 V (V) B 1.4 1.6 1.8 64 0.8 1.0 1.2 1.4 V B (V) 1.6 1.8 Fig. 6 Load Current vs Supply Voltage Fig. 7 Absolute Voltage Gain vs Supply Voltage A (dB) V 0 AV (dB) 6 4.8 -20 3.6 2.4 -40 1.2 0 10 100 1k RVC () 10k 1 2 5 10 R B () 20 50 100 Fig. 8 Relative Voltage Gain vs Volume Control Resistance Fig. 9 Relative Voltage Gain vs Battery Resistance 500 - 15 - 09 4 VCR (dB) g (mV) m 46 6 44 4 42 2 40 10 100 R () E 1k 10k 0 10 100 R () E 1k 10k Fig. 10 Volume Control Range vs Emitter Resistor Fig. 11 Transductance vs Emitter Resistor 2.2 k + 10 1k 3 5 0.33 4 6 100 k + 10 LC505 1 2 VB =1.35 Vcc + 10 1k VB =1.35 Vcc 8 6 0.333 5 7 4 3 LD505 1 2 10k + 10 33 100k + 10 33 MAXIMUM OUTPUT CONTROL All resistors in ohms, all capacitors in microfarads unless otherwise stated All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 12 LC505 Typical Hearing Aid Application Fig. 13 LD505 Typical Hearing Aid Application DOCUMENT IDENTIFICATION 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: Chip information 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 March 1976 Gennum Corporation. All rights reserved. Printed in Canada. 5 500 - 15 - 09 |
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