Low Cost, High Speed Differential Amplifier AD8132 FEATURES CONNECTION DIAGRAM High speed AD8132 IN 1 8 +IN 350 MHz, 3 dB bandwidth V 2 7 NC OCM 1200 V/s slew rate V+ 3 6 V Resistor set gain +OUT 4 5 OUT Internal common-mode feedback NC = NO CONNECT Improved gain and phase balance: 68 dB 10 MHz Figure 1. Separate input to set the common-mode output voltage Low distortion: 99 dBc SFDR 5 MHz, 800 load The AD8132 is also used as a differential driver for the trans- Low power: 10.7 mA 5 V mission of high speed signals over low cost twisted pair or coaxial cables. The feedback network can be adjusted to boost the high Power supply range: +2.7 V to 5.5 V frequency components of the signal. The AD8132 is used for either Fully AEC-Q100 qualified (AD8132W) analog or digital video signals or for other high speed data trans- mission. The AD8132 is capable of driving either a Category 3 APPLICATIONS or Category 5 twisted pair or coaxial cable with minimal line Low power differential ADC drivers attenuation. The AD8132 has considerable cost and performance Differential gain and differential filtering improvements over discrete line driver solutions. Video line drivers Differential in/out level shifting Differential signal processing reduces the effects of ground noise Single-ended input to differential output drivers that plagues ground-referenced systems. The AD8132 can be used Active transformers for differential signal processing (gain and filtering) throughout a Automotive driver assistance signal chain, easily simplifying the conversion between differential Automotive infotainment and single-ended components. The AD8132W is the automotive grade version, qualified for GENERAL DESCRIPTION 125C operation per the AEC-Q100. See the Automotive The AD8132 is a low cost differential or single-ended input to Products section for more details. differential output amplifier with resistor set gain. The AD8132 The AD8132 is available in both 8-lead SOIC and 8-lead MSOP is a major advancement over op amps for driving differential input packages for operation over the extended industrial temperature ADCs or for driving signals over long lines. The AD8132 has a range of 40C to +125C. unique internal feedback feature that provides output gain and phase matching balanced to 68 dB at 10 MHz, suppressing 6 harmonics and reducing radiated EMI. V = 5V S G = +1 3 V = 2V p-p O, dm Manufactured using the next-generation of Analog Devices, Inc., R = 499 L, dm XFCB bipolar process, the AD8132 has a 3 dB bandwidth of 0 350 MHz and delivers a differential signal with 99 dBc SFDR at 5 MHz, despite its low cost. The AD8132 eliminates the need for 3 a transformer with high performance ADCs, preserving the low frequency and dc information. The common-mode level of the 6 differential output is adjustable by applying a voltage on the V pin, easily level shifting the input signals for driving single- OCM 9 supply ADCs. Fast overload recovery preserves sampling accuracy. 12 1 10 100 1k FREQUENCY (MHz) Figure 2. Large Signal Frequency Response Rev. I 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 20002009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. GAIN (dB) 01035-001 01035-002AD8132 TABLE OF CONTENTS Features .............................................................................................. 1 Differential Amplifier Without Resistors (High Input Impedance Inverting Amplifier) .............................................. 22 Applications ....................................................................................... 1 Other 2 = 1 Circuits ................................................................. 23 General Description ......................................................................... 1 Varying 2 ................................................................................... 23 Connection Diagram ....................................................................... 1 1 = 0............................................................................................ 23 Revision History ........................................................................... 3 Estimating the Output Noise Voltage ...................................... 23 Specif icat ions ..................................................................................... 4 Calculating Input Impedance of the Application Circuit ..... 24 D to OUT Specifications ...................................................... 4 IN Input Common-Mode Voltage Range in Single-Supply V to OUT Specifications ..................................................... 5 OCM Applications ................................................................................ 24 DIN to OUT Specifications ...................................................... 6 Setting the Output Common-Mode Voltage .......................... 24 VOCM to OUT Specifications ..................................................... 7 Driving a Capacitive Load ......................................................... 24 DIN to OUT Specifications ...................................................... 8 Open-Loop Gain and Phase ..................................................... 24 VOCM to OUT Specifications ..................................................... 8 Layout, Grounding, and Bypassing .............................................. 25 Absolute Maximum Ratings ............................................................ 9 Circ uits ......................................................................................... 25 Thermal Resistance ...................................................................... 9 Applications Information .............................................................. 26 Maximum Power Dissipation ..................................................... 9 Analog-to-Digital Driver .......................................................... 26 ESD Caution .................................................................................. 9 Balanced Cable Driver ............................................................... 26 Pin Configuration and Function Descriptions ........................... 10 Transmit Equalizer ..................................................................... 27 Typical Performance Characteristics ........................................... 11 Low-Pass Differential Filter ...................................................... 27 Test Circuits ..................................................................................... 20 High Common-Mode Output Impedance Amplifier ........... 28 Operational Description ................................................................ 21 Full-Wave Rectifier .................................................................... 29 Definition of Terms .................................................................... 21 Automotive Products ................................................................. 29 Basic Circuit Operation ............................................................. 21 Outline Dimensions ....................................................................... 30 Theory of Operation ...................................................................... 22 Ordering Guide .......................................................................... 30 General Usage of the AD8132 .................................................. 22 Rev. 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