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| Class A Amplifier with 3 Gain Blocks & Schottky Diodes LS509 DATA SHEET FEATURES * 140 A typical current drain * low noise and distortion DESCRIPTION The LS509 is a Class A amplifier utilizing Gennum's proprietary low voltage JFET technology. It consists of two singleended, low noise inverting gain blocks, a Class A output stage, an on-chip microphone decoupling resistor and a pair of Schottky diodes for symmetrical peak clipping. Blocks A and B typically have an open loop voltage gain of 56 dB, with the closed loop gain set by the ratio of the feedback resistor to the source impedance. It is recommended that the maximum closed loop gain be 20 dB lower than the open loop gain. All blocks of the device are internally bias compensated, preventing any DC current flow via external feedback resistors. Without this compensation, audible scratchiness would be present during changes in volume control settings. The output stage of the LS509 is a Class A current drive. It has a fixed reference voltage of typically 29 mV at pin 2 of the device. The current that flows in the transducer is the ratio of the 29 mV reference voltage and the on-chip emitter resistor (R ). To increase the bias current in the E transducer, simply place an external RE resistor from pin 2 to ground, thereby decreasing the equivalent emitter resistance and increasing the current. The LS509 also contains a pair of Schottky diodes in the feedback configuration of the output stage, which provides approximately 12 dB of MPO control. VB 8 VMIC * 1.0 to 5 VDC operating range * * * * * * independent preamplifier 2 DC coupled stages class A output stage variable transducer current Schottky diodes for MPO control 4 k microphone decoupling resistor STANDARD PACKAGING * 10 pin PLID(R) * 10 pin SLT * Chip (61 x 55 mils) 7 RMIC 9 MPO 21k A I/P 6 -A -B -C 10 2 RE C O/P RE 5 A O/P 4 B I/P 3 B O/P 1 GND All resistors in ohms, all capacitors in farads unless otherwise stated BLOCK DIAGRAM Revision Date: January 2001 Document No. 510 - 12 - 08 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 PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range VALUE/UNITS 5 V DC 25 mW -10C to 40 C -20C to 70 C A OUT B IN B OUT RE GND PIN CONNECTION 5 6 A IN VMIC VB MPO 1 10 C OUT CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS VP - Pin voltage measured with conditions as shown in Test Circuit. Positive current corresponds to current INTO the pin. Negative current corresponds with current OUT of the pin. Conditions: Frequency = 1 kHz, Temperature = 25C, Supply Voltage VB = 1.3 V PARAMETER Amplifier Current Transducer Current Maximum Transducer Current A Input Bias Voltage (pin 6) A Input Bias Current (pin 6) B Input Bias Current (pin 4) A O/P Voltage Swing-Hi (pin 5) A Output Swing-Lo (pin 5) SYMBOL IAMP ITRANS ITRANS (MAX) VBIAS A IBIAS A IBIAS B VOH A V OL A AOL VSAT C AOUT VD VRE RMIC RE IRN THD CONDITIONS MIN 75 170 TYP 140 230 570 0 0 580 280 MAX 205 290 650 50 50 - UNITS A A mA mV nA nA mV mV V P2 = 0 V RFA = 1 M (Note 1) V IN = 0.4 V DC, RFA = , IP5 = -10 A (Note 3) IIN = +1A, RFA = , IP5 = +10 A (Note 4) RL = 1 k, VP2 = 0 V (S2 = b) R L = RFB = 1 M (Note 2) 2 500 -50 -50 200 200 A Open Loop Voltage Gain C Output Sat. Voltage (pin 10) A Output Current Capability (pin 5) 46 - 56 100 30 265 28.5 4 125 1 1 180 325 35.5 5 160 - dB mV A mV mV k VRMS % Diode Voltage Drop Emitter Bias Voltage (pin 2) On-chip Microphone Resistor On-chip Emitter Resistor Input Referred Noise Harmonic Distortion , (Note 5) 140 21.5 3 90 NFB 0.2 to10kHz at 12dB/Oct V OUT = 500 mVRMS - All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column Notes 1. IBIAS A = (V P6 -VP6[RFA = 1M])/1M 2. IBIAS B = (VP4 -VP4 [RFB = 1M])/1M 3. VOH A = (V P5-VP5 [VIN = 0.4 VDC, RFA = , IP5 = -10A]) 4. VOL A = (VP5 -VP5 [IIN = +1A, RFA = , IP5 =+10A]) V ) 5. VD = (V P10 [Id = +(1.5 x ITRANS)] - P10 [Id = +(0.5 x ITRANS)] 510 - 12 - 08 2 I AMP 1.3 VDC I TRANS 8 7 RMIC 9 a VIN a RS 3k92 CS 10 RE 5 180 V RMS 1kHz RFA = 0 4 RFB = 0 3 1 b S1 6 21k S2 b RL =0 -A -B -C 10 2 Id = 0A IP5 = 0A All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 1 Test Circuit RMIC 7 8 9 5 BASE CURRENT COMPENSATION 3 RE 10 2 6 4 1 All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 2 Functional Schematic 3 510 - 12 - 08 VB = 1.3 V DC ED1913 8 7 10 RMIC 21k 9 01 R MPO RS 3k9 CS 022 6 50k RLAC -A -B -C 10 2 RE 01 5 100k RGT 01 5k6 4 100k 3 1 56 RVC All resistors in ohms, all capacitors in farads unless otherwise stated. Gain of Stage A = 20 log RGT RS Gain of Stage B = 20 log RVC 5.6 k Gain of Stage C = 20 log RLAC//21K 56//RE Fig 3 Typical Hearing Instrument Application 5 -5 -15 0 -2 RMPO = 50k RMPO = 22k RMPO = 10k RVC = 100K -4 -6 OUTPUT (dBV) -25 -35 -45 -55 -65 -75 -140 RVC = 47K RVC = 10K RVC = 3.3K OUTPUT (dBV) -8 -10 -12 -14 -16 RMPO = 0k RMPO = 3.3k RVC = 22K -120 -100 -80 -60 -40 -18 -20 -90 -80 -70 -60 -50 -40 INPUT (dBV) INPUT (dBV) Fig. 4 I/O Curves at Various RVC Settings 4 5 Fig. 5 I/O Curves at Various RMPO Values CS = 0.22 0 0 CS = 0.1 RELATIVE GAIN (dB) -4 RELATIVE GAIN (dB) CS = 0.033 -5 -10 -15 -20 -25 -30 -8 CS = 0.047 -12 -16 -20 20 200 2k 20k 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 FREQUENCY (Hz) SUPPLY VOLTAGE (V) Fig. 6 Closed Loop Frequency Response with Various CS Values 510 - 12 - 08 Fig. 7 Gain vs Supply Voltage 4 RELATIVE TRANSDUCER CURRENT (A) -10 0 10 20 30 40 50 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -20 10 6 2 -2 -6 -10 -14 -18 -20 -10 0 10 20 30 40 50 RELATIVE GAIN (dB) TEMPERATURE (oC) TEMPERATURE (oC) Fig. 8 Gain vs Temperature Fig. 9 Transducer Current vs Temperature 24 60 55 50 RELATIVE AMPLIFIER CURRENT (A) 16 8 -8 -16 -24 -32 -40 -20 Gain (dB) 0 45 40 35 30 25 20 -10 0 10 20 30 40 50 10 100 1k 10k 100k TEMPERATURE (oC) FREQUENCY (Hz) Fig. 10 Amplifier Current vs Temperature Fig. 11 Preamplifier A Open Loop Frequency Response 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: 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: 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 October 1987 Gennum Corporation. All rights reserved. Printed in Canada. 5 510 - 12 - 08 |
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