GENNUM C O R P O R A T I O High Gain Class A Amplifier N LC505/LD505 DATA SHEET FEATURES DESCRIPTION • 71 dB of gain with 1.3 V supply 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. D E D S N E GN M SI M E O D C E R EW T N O N OR F • 0.2 to 2.0 mA of transducer current adjustment • 43 dB of volume control range • 1.0 to 1.6 V supply operating range • 2.2 kΩ internal decoupling resistor for microphone bias (LD505 only) • output limiting capabilities (LD505 only) STANDARD PACKAGING 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 kΩ 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. • MINIpac P6 (LC505) • MINIpac P8 (LD505) VB 8 3 OUT + 3 OUT + 6 - - 33k VC 1 2.2k IN 5 LIMITER 4 2 IN VB MICBIAS 33k 100 4 VC 6 200 GND All resistors in ohms, all capacitors in microfarads unless otherwise stated LC505 BLOCK DIAGRAM 1 100 5 7 RE 2 200 RE GND All resistors in ohms, all capacitors in microfarads unless otherwise stated LD505 BLOCK DIAGRAM Revision Date: January 1996 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 Document No. 500 - 15 - 09 500 - 15 - 09 tel. (905) 632-2996 fax: (905) 632-5946 tel. (03) 3334-7700 fax (03) 3247-8839 PIN CONNECTION ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE & UNITS Supply Voltage VB 4 3 VC 3V Power dissipation IN OUT -10 to +40 °C Operating Temperature 1 RE 25 mW 6 GND LC505 CAUTION CLASS 1 ESD SENSITIVITY V B 5 4 OUT IN R E LIMITER VC 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 SYMBOL MIN TYP MAX 68 72 76 dB 66 71 76 dB - 0.07 - - 0.21 0.28 mA - 0.16 0.23 mA - -0.002 - 1.3 1.5 1.9 mA 1.0 1.3 1.7 mA - 2 5 % Vcc = 1.3 V - - 6 % Input Referred Noise Bandwidth at 12 dB/OCT - 0.2 to 10 kHz - 1.2 2.0 Battery Resistance Stability RVC = 100k (S1-open) 22 - - Ω Gain AV Temperature Coefficient of Gain ηA Amplifier Current IA Temperature Coefficient of Current ηΙ Transducer Current I L CONDITIONS VCC = 1.3 V Vcc = 1.3 V Vcc = 1.3 V UNITS dB/oC mA/ oC Total Harmonic Distortion Input Impedance Frequency Response (-3 dB) Volume Control Range µVRMS LC505 - 8 - kΩ LD505 - 27 - kΩ Low - 100 - Hz High - 5000 - Hz R VC = 0 to 100kΩ 36 43 - dB (S1 - closed/open) R VC = 0 to 100kΩ 34 42 - dB (S1 - closed/open) Vcc = 1.3 V Gain Dependance of RB 500 - 15 - 09 LC505 - -0.4 - dB/Ω LD505 - +0.16 - dB/Ω 2 RB = 4.7 IA VB = 1.5 VDC VO 3 1k RS 3.9k 2 0.33 5 + IL S1 1kHz 33k 4 100 200 + 100k 10 1 6 RE 33 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 1 LC505 Test Circuit RB = 4.7 IA 10 + VB = 1.5 VDC VO 8 4 1 1k 2.2k RS 3.9 3 0.033 6 + IL S1 1kHz 33 k 5 + 100k 10 100 200 100 2 7 RE 33 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 2 LD505 Test Circuit VB 2.2k LIMITER (LD ONLY) MIC BIAS (LD ONLY) 30k 27k OUTPUT INPUT 100 RE 33k 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) IL (µA) L 3 200 2 100 1 0 10 100 1k 0.8 10k 1.0 1.2 1.4 1.6 1.8 VB (V) RE (Ω) Fig. 4 Load Current vs Emitter Resistor Fig. 5 Amplifier Current vs Supply Voltage AV (dB) IL (mA) 74 2 72 70 1 68 66 0 0.8 1.0 1.2 V (V) B 1.4 1.6 64 1.8 0.8 Fig. 6 Load Current vs Supply Voltage 1.0 1.2 1.4 V B (V) 1.6 1.8 Fig. 7 Absolute Voltage Gain vs Supply Voltage AV (dB) A (dB) V 0 6 4.8 -20 3.6 2.4 -40 1.2 0 10 100 1k 10k 1 RVC (Ω) 5 10 R B (Ω) 20 Fig. 9 Relative Voltage Gain vs Battery Resistance Fig. 8 Relative Voltage Gain vs Volume Control Resistance 500 - 15 - 09 2 4 50 100 g (mV) VCR (dB) m 46 6 44 4 42 2 40 10 100 1k 0 10k 10 R (Ω) 100 E Fig. 11 Transductance vs Emitter Resistor VB =1.35 Vcc 2.2 k + 10 VB =1.35 Vcc 10 1k 1k 3 5 0.33 0.333 1 100 k LD505 1 7 2 5 6 + 3 6 LC505 + 4 8 2 4 10k E Fig. 10 Volume Control Range vs Emitter Resistor + 1k R (Ω) 10 10k MAXIMUM OUTPUT CONTROL 100k 33 33 + 10 10 All resistors in ohms, all capacitors in microfarads unless otherwise stated All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 13 LD505 Typical Hearing Aid Application Fig. 12 LC505 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. © Copyright March 1976 Gennum Corporation. All rights reserved. Printed in Canada. 5 500 - 15 - 09