Audio, Dual-Matched NPN Transistor Data Sheet SSM2212 FEATURES PIN CONNECTIONS Very low voltage noise: 1 nV/Hz maximum at 100 Hz C 1 8 C 1 2 B 2 7 B Excellent current gain match: 0.5% 1 2 E 3 6 E 1 2 Low offset voltage (V ): 200 V maximum (SOIC) OS NIC 4 SSM2212 5 NIC Outstanding offset voltage drift: 0.03 V/C NOTES High gain bandwidth product: 200 MHz 1. NIC = NO INTERNAL CONNECTION. Figure 1. 8-Lead SOIC N E 1 12 NIC 1A E 2 11 C 1B 2 SSM2212 E 3 10 NIC 2B E 4 9 NIC 2A NOTES 1. NIC = NO INTERNAL CONNECTION. Figure 2. 16-Lead LFCSP WQ GENERAL DESCRIPTION The SSM2212 is a dual, NPN-matched transistor pair that is Stability of the matching parameters is guaranteed by protection specifically designed to meet the requirements of ultralow noise diodes across the base-emitter junction. These diodes prevent audio systems. degradation of beta and matching characteristics due to reverse biasing of the base-emitter junction. With its extremely low input base spreading resistance (rbb is typically 28 ) and high current gain (h typically exceeds 600 at The SSM2212 is also an ideal choice for accurate and reliable FE I = 1 mA), the SSM2212 can achieve outstanding signal-to-noise current biasing and mirroring circuits. Furthermore, because C ratios. The high current gain results in superior performance the accuracy of a current mirror degrades exponentially with compared to systems incorporating commercially available mismatches of VBE between transistor pairs, the low VOS of the monolithic amplifiers. SSM2212 does not need offset trimming in most circuit applications. Excellent matching of the current gain (hFE) to approximately 0.5% and low VOS of less than 10 V typical make the SSM2212 The SSM2212 SOIC performance and characteristics are ideal for symmetrically balanced designs, which reduce high- guaranteed over the extended temperature range of 40C to order amplifier harmonic distortion. +85C. The SSM2212 is available in 8-lead SOIC and 16-lead LFCSP packages. 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 20102015 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. NIC NIC B B 2 1 NIC NIC NIC C 1 09043-020 09043-001 5 16 6 15 7 14 8 13SSM2212 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Thermal Resistance .......................................................................5 Pin Connections ............................................................................... 1 ESD Caution...................................................................................5 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................6 Revision History ............................................................................... 2 Pin Configurations and Function Descriptions ............................9 Specifications ..................................................................................... 3 Applications Information .............................................................. 10 Electrical CharacteristicsSOIC Package ................................ 3 Fast Logarithmic Amplifier ....................................................... 10 Electrical CharacteristicsLFCSP Package .............................. 4 Outline Dimensions ....................................................................... 11 Absolute Maximum Rating ............................................................. 5 Ordering Guide .......................................................................... 11 REVISION HISTORY 6/15Rev. B to Rev. C Added LFCSP Package ....................................................... Universal Changes to Features Section and General Description Section ....... 1 Changed Pin Configuration Section to Pin Connections Section .. 1 Added Figure 2 Renumbered Sequentially ....................................... 1 Added Electrical CharacteristicsLFCSP Package Section and Table 2 Renumbered Sequentially ...................................................... 4 Changes to Table 4 .................................................................................. 5 Added Pin Configurations and Function Descriptions Section, Figure 17, Table 5, Figure 18, and Table 6 .......................................... 9 Added Figure 21 .................................................................................... 11 Updated Outline Dimensions ............................................................ 11 Changes to Ordering Guide ................................................................ 11 7/10Rev. A to Rev. B Changes to Figure 1 .......................................................................... 1 6/10Rev. 0 to Rev. A Changes to Fast Logarithmic Amplifier Section .......................... 8 6/10Revision 0: Initial Version Rev. C Page 2 of 12