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| High Power, Class B Output Stage GS551 DATA SHEET FEATURES * adjustable gain to 48 dB * capable of driving low impedance receiver * low component count, 3 small capacitors and 1 resistor * gain trim can be used as vol. control for reduced noise * minimal start-up transient * no gain expansion STANDARD PACKAGING * 10 pin MICROpac * 10 pin PLID(R) * 10 pin SLT * Chip (68 x 60 mils) CIRCUIT DESCRIPTION The GS551 is a 10 pin, low voltage, class B amplifier which operates over a battery range of 1.1 VDC to 3 VDC. The GS551 consists of three gain blocks. The first block is an inverting amplifier with the gain set by two external resistors. The gain trim feature can be used as a volume control in hearing aid applications. The second block is an inverting unity gain amplifier which serves as a phase splitter. The outputs from the first and second blocks drive the differential input of the third block. The third block has a fixed AC gain of 28 dB when driving a receiver. The amplifier has internal compensation eliminating the need for a capacitor across the receiver. Two ground pins are available for "Star" grounding to reduce any second order harmonic distortion introduced by ground line resistance. VB 6 10 A IN 5 -A -B C C OUT 2 A OUT REFERENCE VOLTAGE 4 2 GND 1 U.S. Patent No. 4,719,430 Other Patents Pending 1 C OUT 1 83 9 GND 2 7 VREF DEC 2 DEC 1 BLOCK DIAGRAM Revision Date: January 2001 Document No. 510 - 31 - 04 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 VALUE/UNITS PIN CONNECTION Supply Voltage Operating Temperature Storage Temperature CAUTION CLASS 1 ESD SENSITIVITY 5 VDC -10 to +40 C -20 to +70 C A IN A OUT DEC 1 GND 1 C OUT 1 5 6 VB VREF DEC 2 GND 2 1 10 COUT 2 ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C, Supply Voltage VB = 1.3 VDC PARAMETER Gain Amplifier Current Transducer Current Input Referred Noise Total Harmonic Distortion SYMBOL AV IAMP I TRANS IRN THD RSTAB IOUT CONDITIONS VO=0.707 VRMS MIN 46 120 120 TYP 48 220 250 1.3 0.25 0.3 >35 MAX 50 335 390 2.5 1.3 1.5 22 - UNITS dB A A V % % mA NFB 0.2 to 10 kHz at 12 dB/Oct VO=0.707 VRMS VO=1.3 VRMS - Stable with RB to Maximum Output Current RB=22 V P8=0 All parameters remain as shown in Test Circuit unless otherwise stated in "Conditions" column VB = 1.3VDC 6 10 CS 0.1 RS 10k 100k 1 kHz 4 2 9 7 83 0.047 0.047 REFERENCE VOLTAGE RB = 4.7 IOUT VO 5 -A -B C RL = 400 1 All resistors in ohms,all capacitors in farads unless otherwise stated Fig. 1 Test Circuit 510 - 31 - 04 2 6 4 7 Base Current Compensation 2 5 6 1 10 8 3 2 9 Fig. 2 GS551 Functional Schematic 1.3 VDC 3 4.7 2 RS 3.9k 0.1 + _ RVC 100k REFERENCE VOLTAGE LC506 5 4 2 GS551 9 83 7 0.047 0.047 All resistors in ohms,all capacitors in farads unless otherwise stated 4 REGULATOR 6 10 0.1 10k 5 -A -B C CI2960 230 1 1.0 RGT 50k 30k 1 Fig. 3 Application Circuit 3 510 - 31 - 04 10 0 -10 RVC=47k RVC=100k 4 2 0 -2 CS=0.22 F CS=0.1 F CS=0.047 F CS=0.033F RELATIVE OUTPUT (dB) -20 OUTPUT (dBV) -30 -40 -50 -60 -70 -80 RVC=22k RVC=10k -4 -6 -8 -10 -12 -14 -16 -18 -20 20 RVC=3.3k -90 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 200 2k 20k INPUT (dBV) FREQUENCY (Hz) Fig. 4 I/O Characteristics at Various Gain Settings (RS=3.92k) 14 13 12 11 10 5 0 -5 Fig. 5 Closed Loop Frequency Response at Various CS Values (RS=3.92k) POWER OUTPUT (mW) RELATIVE GAIN (dB) 0 100 200 300 400 500 600 700 800 900 1000 10 9 8 7 6 5 4 3 2 1 0 -10 -15 -20 -25 -30 -35 -40 -45 -50 .8 .9 1 1.1 1.2 1.3 1.4 LOAD RESISTANCE () SUPPLY VOLTAGE (VDC) Fig. 6 Power Outout vs Load Resistance at 7% Distortion, RB=0, VB=1.35V 0.10 50 Fig. 7 Gain vs Supply Voltage 0.06 RELATIVE AMPLIFIER CURRENT (A) 0.08 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -20 -10 0 10 20 30 40 50 RELATIVE GAIN (dB) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 -20 -10 0 10 20 30 40 50 TEMPERATURE (C) TEMPERATURE (C) Fig. 8 Gain vs Temperature Fig. 9 Amplifier Current vs Temperature 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 August 1988 Gennum Corporation. All rights reserved. Printed in Canada. 510 - 31 - 04 4 |
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