Low Noise, Precision CMOS Amplifier Data Sheet AD8655/AD8656 FEATURES PIN CONFIGURATIONS Low noise: 2.7 nV/ Hz at f = 10 kHz NC 1 8 NC OUT A 1 8 V+ AD8655 AD8656 Low offset voltage: 250 V max over V CM IN 2 7 V+ IN A 2 7 OUT B TOP VIEW +IN 3 6 OUT +IN A 3 TOP VIEW 6 IN B Offset voltage drift: 0.4 V/C typ and 2.3 V/C max (Not to Scale) (Not to Scale) V 4 5 +IN B V 4 5 NC Bandwidth: 28 MHz Rail-to-rail input/output NC = NO CONNECT Unity gain stable Figure 2. AD8656 Figure 1. AD8655 2.7 V to 5.5 V operation 8-Lead MSOP (RM-8) 8-Lead MSOP (RM-8) 8-Lead SOIC (R-8) 40C to +125C operation 8-Lead SOIC (R-8) Qualified for automotive applications APPLICATIONS ADC and DAC buffers Audio Industrial controls Precision filters Digital scales Automotive collision avoidance PLL filters GENERAL DESCRIPTION The AD8655/AD8656 are the industrys lowest noise, precision The high precision performance of the AD8655/AD8656 improves CMOS amplifiers. They leverage the Analog Devices DigiTrim the resolution and dynamic range in low voltage applications. technology to achieve high dc accuracy. Audio applications, such as microphone pre-amps and audio mixing consoles, benefit from the low noise, low distortion, and The AD8655/AD8656 provide low noise (2.7 nV/Hz at 10 kHz), high output current capability of the AD8655/AD8656 to reduce low THD + N (0.0007%), and high precision performance system level noise performance and maintain audio fidelity. The (250 V max over V ) to low voltage applications. The ability CM high precision and rail-to-rail input and output of the AD8655/ to swing rail-to-rail at the input and output enables designers AD8656 benefit data acquisition, process controls, and PLL to buffer analog-to-digital converters (ADCs) and other wide filter applications. dynamic range devices in single-supply systems. The AD8655/AD8656 are fully specified over the 40C to +125C temperature range. The AD8655/AD8656 are available in Pb-free, 8-lead MSOP and SOIC packages. The AD8655/ AD8656 are both available for automotive applications. Rev. E 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 20052013 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. 05304-048 05304-059AD8655/AD8656 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Input Overvoltage Protection ................................................... 16 Applications ....................................................................................... 1 Input Capacitance ...................................................................... 16 Pin Configurations ........................................................................... 1 Driving Capacitive Loads .......................................................... 16 General Description ......................................................................... 1 Layout, Grounding, and Bypassing Considerations .................. 18 Revision History ............................................................................... 2 Power Supply Bypassing ............................................................ 18 Specifications ..................................................................................... 3 Grounding ................................................................................... 18 Absolute Maximum Ratings ............................................................ 5 Leakage Currents ........................................................................ 18 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 19 Typical Performance Characteristics ............................................. 6 Ordering Guide ............................................................................... 19 Theory of Operation ...................................................................... 15 Automotive Products ................................................................. 19 Applications Information .............................................................. 16 REVISION HISTORY 10/13Rev. D to Rev. E 6/05Rev. 0 to Rev. A Changes to Figure 1 Caption and Figure 2 Caption .................... 1 Added AD8656 ................................................................... Universal Deleted Figure 3 and Figure 4 Renumbered Sequentially ......... 1 Added Figure 2 and Figure 4 ........................................................... 1 Change to General Description Section ........................................ 1 Changes to Specifications ................................................................. 3 Change to Figure 4 ........................................................................... 6 Changed Caption of Figure 12 and Added Figure 13 ................... 7 Change to Figure 32 ....................................................................... 10 Replaced Figure 16 ............................................................................ 7 Changes to Ordering Guide .......................................................... 19 Changed Caption of Figure 37 and Added Figure 38 ................ 11 Changes to Automotive Products Section ................................... 19 Replaced Figure 47 ......................................................................... 13 Added Figure 55 ............................................................................. 14 6/13Rev. C to Rev. D Changes to Ordering Guide .......................................................... 18 Change to Figure 57 ....................................................................... 16 4/05Revision 0: Initial Version 5/13Rev. B to Rev. C Change to Figure 57 ....................................................................... 16 9/11Rev. A to Rev. B Changes to Features Section............................................................ 1 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 Added Automotive Products Section .......................................... 19 Rev. E Page 2 of 20