Low Cost, Low Power, Differential ADC Driver Data Sheet AD8137 FEATURES FUNCTIONAL BLOCK DIAGRAM Fully differential AD8137 IN 1 8 +IN Extremely low power with power-down feature V 2 7 PD OCM 2.6 mA quiescent supply current 5 V V 3 6 V 450 A in power-down mode 5 V S S+ High speed +OUT 4 5 OUT 110 MHz large signal 3 dB bandwidth G = 1 Figure 1. 450 V/s slew rate 12-bit SFDR performance 500 kHz Fast settling time: 100 ns to 0.02% 3 G = 1 2 Low input offset voltage: 2.6 mV max 1 Low input offset current: 0.45 A max 0 Differential input and output 1 G = 2 G = 5 Differential-to-differential or single-ended-to-differential 2 3 operation 4 Rail-to-rail output 5 Adjustable output common-mode voltage G = 10 6 Externally adjustable gain 7 8 Wide supply voltage range: 2.7 V to 12 V 9 Available in small SOIC package 10 R = 1k G Qualified for automotive applications 11 V = 0.1V p-p O, dm 12 0.1 1 10 100 1000 APPLICATIONS FREQUENCY (MHz) ADC drivers Figure 2. Small Signal Response for Various Gains Automotive vision and safety systems Automotive infotainment systems Portable instrumentation Battery-powered applications Single-ended-to-differential converters Differential active filters Video amplifiers Level shifters GENERAL DESCRIPTON The AD8137 is a low cost differential driver with a rail-to-rail closed-loop gain of the amplifier. The power-down feature is output that is ideal for driving ADCs in systems that are sensitive beneficial in critical low power applications. to power and cost. The AD8137 is easy to apply, and its internal The AD8137 is manufactured on Analog Devices, Inc., common-mode feedback architecture allows its output common- proprietary second-generation XFCB process, enabling it to mode voltage to be controlled by the voltage applied to one pin. achieve high levels of performance with very low power The internal feedback loop also provides inherently balanced consumption. outputs as well as suppression of even-order harmonic distortion The AD8137 is available in the small 8-lead SOIC package and products. Fully differential and single-ended-to-differential gain 3 mm 3 mm LFCSP package. It is rated to operate over the configurations are easily realized by the AD8137. External extended industrial temperature range of 40C to +125C. feedback networks consisting of four resistors determine the Rev. E 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20042012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. NORMALIZED CLOSED-LOOP GAIN (dB) 04771-0-001 04771-0-002AD8137 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ..................................................................................... 21 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 22 Functional Block Diagram .............................................................. 1 Applications Information .............................................................. 23 General Descripton .......................................................................... 1 Analyzing a Typical Application with Matched RF and RG Networks ...................................................................................... 23 Revision History ............................................................................... 2 Estimating Noise, Gain, and Bandwith with Matched Specifications ..................................................................................... 3 Feedback Networks .................................................................... 23 Absolute Maximum Ratings ............................................................ 9 Driving an ADC with Greater than 12-Bit Performance ...... 27 Thermal Resistance ...................................................................... 9 Outline Dimensions ....................................................................... 29 Maximum Power Dissipation ..................................................... 9 Ordering Guide .......................................................................... 30 ESD Caution .................................................................................. 9 Automotive Products ................................................................. 30 Pin Configuration and Function Descriptions ........................... 10 Typical Performance Characteristics ........................................... 11 REVISION HISTORY 7/12Rev. D to Rev. E 8/04Rev. 0 to Rev. A. Changes to Features Section and Applications Section ............... 1 Added 8-Lead LFCSP ......................................................... Universal Added AD8137W ............................................................... Universal Changes to Layout .............................................................. Universal Updated Outline Dimensions ....................................................... 28 Changes to Product Title and Figure 1 ........................................... 1 Changes to Ordering Guide .......................................................... 29 Changes to Specifications ................................................................. 3 Changes to Absolute Maximum Ratings ........................................ 6 Added Automotive Products Section .......................................... 29 Changes to Figure 4 and Figure 5 .................................................... 7 7/10Rev. C to Rev. D Added Figure 6, Figure 20, Figure 23, Figure 35, Figure 48, Changes to Power-Down Section, Added Figure 68, and Figure 58 Renumbered Sequentially ...................................... 7 Renumbered Subsequent Figures ................................................. 24 Changes to Figure 32 ...................................................................... 12 Changes to Ordering Guide .......................................................... 27 Changes to Figure 40 ...................................................................... 13 Changes to Figure 55 ...................................................................... 16 12/09Rev. B to Rev. C Changes to Table 7 and Figure 63................................................. 18 Changes to Product Title, Applications Section, and General Changes to Equation 19 ................................................................. 19 Description Section .......................................................................... 1 Changes to Figure 64 and Figure 65............................................. 20 Changes to Input Resistance Parameter Unit, Table 3 ................. 5 Changes to Figure 66 ...................................................................... 22 Added EPAD Mnemonic/Description, Table 6 ............................ 7 Added Driving an ADC with Greater Than 12-Bit Added Figure 61 Renumbered Sequentially .............................. 17 Performance Section ...................................................................... 22 Moved Test Circuits Section .......................................................... 18 Changes to Ordering Guide .......................................................... 24 Changes to Power Down Section ................................................. 24 Updated Outline Dimensions ....................................................... 24 Updated Outline Dimensions ....................................................... 26 5/04Revision 0: Initial Version 7/05Rev. A to Rev. B Changes to Ordering Guide .......................................................... 24 Rev. E Page 2 of 32