Trimless Voltage Controlled Amplifier Data Sheet SSM2018 FEATURES FUNCTIONAL BLOCK DIAGRAM 117 dB dynamic range SSM2018 0.006% typical THD+N ( 1 kHz, unity gain) V C 140 dB gain range No external trimming required Differential inputs G V G Complementary gain outputs +IN GAIN Buffered control port I G CORE IV converter on-chip IN Low external parts count 1G V 1G Low cost I 1G Figure 1. GENERAL DESCRIPTION The SSM2018 represents the continuing evolution of the Frey Additional features include differential inputs, a 140 dB (100 dB Operational Voltage Controlled Element (OVCE) topology that to +40 dB) gain range, and a high impedance control port. The permits flexibility in the design of high performance volume SSM2018 provides an internal current-to-voltage converter. control systems. The SSM2018 is laser trimmed for gain core Thus, no external active components are required. symmetry and offset. As a result, the SSM2018 is the first This device is offered in 16-lead, plastic DIP package and professional audio quality VCA to offer trimless operation. guaranteed for operation over the extended industrial Due to careful gain core layout, the SSM2018 combines the low temperature range of 40C to +85C. noise of Class AB topologies with the low distortion of Class A circuits to offer an unprecedented level of sonic transparency. 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 20022013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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Technical Support www.analog.com 00345-001SSM2018 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Control Section ........................................................................... 11 Functional Block Diagram .............................................................. 1 Applications Information .............................................................. 12 General Description ......................................................................... 1 Basic VCA Configuration ......................................................... 12 Revision History ............................................................................... 2 Proper Operating Mode for the SSM2018 .............................. 12 Specifications ..................................................................................... 3 Output Drive ............................................................................... 13 Electrical Specifications ............................................................... 3 Upgrading SSM2018 Sockets .................................................... 13 Absolute Maximum Ratings ............................................................ 4 Temperature Compensation of the Gain Constant ............... 13 Transistor Count ........................................................................... 4 Digital Control of the Gain ....................................................... 14 Thermal Resistance ...................................................................... 4 Supply Considerations and Single-Supply Operation ........... 14 ESD Caution .................................................................................. 4 Operational Voltage Controlled Element................................ 14 Pin Configuration and Function Descriptions ............................. 5 Voltage Controlled Panner ........................................................ 15 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 16 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 16 Compensating the SSM2018 ..................................................... 10 REVISION HISTORY 2/13Rev. B to Rev. C 7/02Rev. A to Rev. B Updated Format .................................................................. Universal Deleted references to SSM2118T ........................................... Global Reorganized Layout ............................................................ Universal Edits to Features ................................................................................ 1 Changed SSM2018T to SSM2018 ................................ Throughout Edits to General Description ........................................................... 1 Changes to Table 2 and Transistor Count Section ........................ 4 Deleted SSM2118T Functional Block Diagram ............................ 1 Added Table 4 ..................................................................................... 5 Deleted 16-Lewad Plastic DIP and SOL from Changed Theory of Operation of the SSM2018T Section to Pin Configurations ............................................................................ 3 Theory of Operation Section Changes to Figure 28 .................. 10 Edits to Ordering Guide ................................................................... 3 Changes to Control Section ........................................................... 11 Deleted SSM2118T Typical Application Circuit ........................... 3 Changed Applications Section to Applications Information Deleted TPCs ................................................................................ 78 Section, Changes to Basic VCA Configuration Section ............. 12 Edits to Applications ...................................................................... 10 Changes to Output Drive Section, Upgrading SSM2018 Sockets Deleted section Basic VCA Configuration For Section, Temperature Compensation of the Gain Constant The SSM21218T ............................................................................. 11 Section, Figure 30, and Figure 31 .................................................. 13 Changes to Digital Control of the Gain Section .......................... 14 Updated Outline Dimensions ........................................................ 16 Changes to Ordering Guide ........................................................... 16 Rev. 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