Audio Dual Matched PNP Transistor Data Sheet SSM2220 FEATURES PIN CONNECTION DIAGRAM SSM2220 Low voltage noise at 100 Hz, 1 nV/Hz maximum TOP VIEW High gain bandwidth: 190 MHz typical (Not to Scale) Gain at I = 1 mA, 165 typical C C 1 8 C 1 2 Tight gain matching: 3% maximum B 2 7 B 1 2 Outstanding logarithmic conformance: r = 0.3 typical BE E 3 6 E 1 2 Low offset voltage: 200 V maximum NC 4 5 NC NOTES APPLICATIONS 1. NC = NO CONNECT. THIS PIN IS NOT CONNECTED INTERNALLY. Microphone preamplifiers Figure 1. Tape head preamplifiers Current sources and mirrors Low noise precision instrumentation Voltage controlled amplifiers/multipliers GENERAL DESCRIPTION The SSM2220 is a dual, low noise, matched PNP transistor, which across the base to emitter junction were used to clamp any reverse has been optimized for use in audio applications. base to emitter junction potential. This prevents a base to emitter breakdown condition, which can result in degradation of gain and The ultralow input voltage noise of the SSM2220 is typically only matching performance due to excessive breakdown current. 0.7 nV/Hz over the entire audio bandwidth of 20 Hz to 20 kHz. The low noise, high bandwidth (190 MHz), and offset voltage of Another feature of the SSM2220 is its very low bulk resistance (200 V maximum) make the SSM2220 an ideal choice for demand of 0.3 typ ical, which assures accurate logarithmic conformance. ing, low noise preamplifier applications. The SSM2220 is offered in 8-lead plastic dual inline (PDIP) and The SSM2220 also offers excellent matching of the current gain 8-lead standard small outline (SOIC), and its performance and (hFE) to about 0.5%, which helps to reduce the high order ampli- characteristics are guaranteed over the extended industrial temper- fier harmonic distortion. In addition, to ensure the long-term ature range of 40C to +85C. stability of the matching parameters, internal protection diodes Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 03096-001SSM2220 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................5 Applications ....................................................................................... 1 Applications Information .................................................................8 Pin Connection Diagram ................................................................ 1 Super Low Noise Amplifier ..........................................................8 General Description ......................................................................... 1 Low Noise Microphone Preamplifier .........................................9 Specifications ..................................................................................... 3 Noise Measurement ................................................................... 10 Electrical Characteristics ............................................................. 3 Current Sources .......................................................................... 10 Absolute Maximum Ratings ............................................................ 4 Outline Dimensions ....................................................................... 12 Thermal Resistance ...................................................................... 4 Ordering Guide .......................................................................... 12 ESD Caution .................................................................................. 4 REVISION HISTORY 4/13Rev. B to Rev. C 11/03Rev. A to Rev. B Updated Format .................................................................. Universal Changes to Ordering Guide ............................................................. 1 Changes to Features Section and Figure 1 ..................................... 1 Updated Outline Dimensions .......................................................... 9 Change to Endnote 2 and Endnote 4, Table 1 ............................... 3 Changed Breakdown Voltage Parameter, Table 2 to Breakdown Voltage (Collector to Emitter), Table 2 ................ 3 Changes to Table 3 ............................................................................ 4 Changes to Figure 8 Caption, Figure 9 Caption, and Figure 12 ..................................................................................... 6 Change to Figure 15 ......................................................................... 7 Changes to Super Low Noise Amplifier Section, Figure 16, and Figure 17 Caption ............................................................................. 8 Change to Figure 18 ......................................................................... 9 Changes to Figure 19 and Noise Measurement Section ............ 10 Changes to Current Sources and Current Matching Sections .......................................................................... 11 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 12 Rev. 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