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| Class A Amplifier with 2 DC Coupled Gain Blocks & Schottky Diodes GK509 DATA SHEET FEATURES * 100 A typical current drain * low noise and distortion * 1.0 to 5 VDC operating range * DC coupled stages * Class A output stage * Schottky diodes for MPO control * variable transducer current * 4 k microphone decoupling resistor STANDARD PACKAGING * 8 pin PLID(R) * Chip ( 61 x 55 mils) DESCRIPTION The GK509 is a Class A amplifier utilizing Gennum's proprietary low voltage JFET technology. It consists of a single-ended, low noise inverting gain block, a Class A output s t a g e , a n o n - c h i p m i c r o p h o n e d e c o u p l i n g r e s i s t o r , and a pair of Schottky diodes for symmetrical peak clipping. Block A typically has 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 GK509 is a Class A current drive. It has a fixed reference voltage of typically 30 mV at pin 2 of the device. The current that flows in the transducer is the ratio of the 30 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 GK509 also contains a pair of Schottky diodes in the feedback configuration of the output stage, which provides approximately 12 dB of MPO control. VB 6 VMIC 5 7 21K RMIC MPO A IN 4 -A -B B OUT 8 2 RE RE 3 A OUT 1 GND All resistors in ohms, all capacitors in farads unless otherwise stated Revision Date: January 2001 BLOCK DIAGRAM Document No. 510 - 69 -06 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 5 V DC -10C to 40 C -20C to 70 C A IN A OUT RE GND 4 5 VMIC VB MPO 1 8 B 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 V B= 1.3 V PARAMETER Amplifier Current Transducer Current Maximum Transducer Current A Input Bias Voltage (pin 4) A Input Bias Current (pin 4) A O/P Voltage Swing-Hi (pin 3) SYMBOL I AMP ITRANS I TRANS (MAX) V BIAS A I BIAS A VOH A CONDITIONS MIN 55 170 TYP 100 230 570 0 580 MAX 145 290 650 50 - UNITS A A mA mV nA mV V P2 = 0 V 2 500 R FA = 1 M, (Note 1) V IN = 0.4 V DC, RFA = IP3 = -10 A (Note 2) -50 , 200 A Output Swing-Lo (pin 3) V OL A IIN = +1 A, RFA = , 200 280 - mV IP3 = +10 A (Note 3) A Open Loop Voltage Gain B Output Sat. Voltage (pin 8) A Output Current Capability Diode Voltage Drop Emitter Bias Voltage (pin 2) On-chip Microphone Resistor On-chip Emitter Resistor Input Referred Noise Harmonic Distortion A OL VSAT B I OUT VD VRE R MIC RE IRN THD NFB 0.2 to 10kHz at 12 dB/Oct 500 mVRMS Output (S2 = b), RL = R L = 1 k, VP2 = 0 V 46 56 100 30 265 30 4 125 1 1 180 325 35.5 5 160 dB mV A mV mV k VRMS % , (Note 4) 140 21.5 3 90 - All parameters and switches remain as shown in Test Circuit unless otherwise stated in CONDITIONS column. NOTES: 1. I BIAS A = (VP4 -V P4[RFA = 1M])/1M 2. V OH A = (VP3 -VP3 [VIN = 0.4VDC, RFA = IP3 = -10 A]) , 3. V OL A = (V P3 -V P3 [IIN = +1A, RFA = , IP3 =+10 A]) 4. V D = (V P8 [Id = +(1.5 x ITRANS)] -VP8 [Id = +(0.5 x ITRANS)] )/2 510 - 69 - 06 2 1.3 VDC I AMP 6 5 7 I TRANS RMIC RL = 0 21K S2 V IN CS 1.0 RS 3.92K 3 a 4 b a b S1 -A -B 8 2 RE 1 Id 1 kHz R FA = 0 I P3 = 0A All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 1 Test Circuit RMIC 6 5 7 21 K BASE CURRENT COMPENSATION 8 2 3 4 RE 1 All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 2 Functional Schematic 3 510 -69 - 06 V =1.3VDC B RMIC 5 1.0 6 50K 7 21K 0.1 R MPO ED1913 RLAC Cs=0.22 4 RS 3.9K RE 56 3 100K RVC 1 -A -B 8 2 All resistors in ohms, all capacitors in farads unless otherwise stated. Gain of Stage A = 20 log RVC RS Gain of Stage B = 20 log RLAC // 21K 56 // RE Fig. 3 Typical Hearing Aid Application -5 -15 -25 -35 0 -2 RVC = 100K RVC = 47K RVC = 3.3K RVC = 10K RMPO = 50K RMPO = 22K RMPO = 10K -4 -6 OUTPUT (dBV) OUTPUT (dBV) -45 -55 -65 -75 -85 -8 -10 -12 -14 -16 RMPO = 0K RMPO = 3.3K RVC = 22K -100 -80 -60 -40 -20 -18 -20 -120 -80 -70 -60 -50 -40 INPUT (dBV) INPUT (dBV) VC Fig. 4 I/O Curves at Various R Settings Fig. 5 I/O Curves at Various RMPO Values 510 - 69 - 06 4 4 10 CS = 0.22 CS = 0.1 RELATIVE GAIN (dB) 0 0 -10 -20 -30 -40 -50 -60 20 200 2K 20K 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 RELATIVE GAIN (dB) -4 -8 CS = 0.047 -12 CS = 0.033 -16 -20 FREQUENCY (Hz) SUPPLY VOLTAGE (V) Fig. 6 Closed Loop Frequency Response with Various CS Values 20 25 20 15 10 5 0 -5 -10 -15 -20 -25 -20 -30 -35 -10 0 10 20 30 40 50 Fig. 7 Gain vs Supply Voltage RELATIVE TRANSDUCER CURRENT (A) RELATIVE AMPLIFIER CURRENT (A) 15 10 5 0 -5 -10 -15 -20 -20 -10 0 10 20 30 40 50 TEMPERATURE (oC) TEMPERATURE (oC) Fig. 8 Amplifier Current vs Temperature 60 55 50 Fig. 9 Transducer Current vs Temperature GAIN (dB) 45 40 35 30 25 20 10 100 1K 10K 100K FREQUENCY (Hz) Fig. 10 Preamplifer 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 -69 - 06 |
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