Low Cost, High Speed Differential Amplifier AD8132

1 Low Cost, High SpeedDifferential Amplifier AD8132 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of analog devices . Trademarks and registered trademarks are the property of their respective owners.

2 One Technology Way, Box 9106, Norwood, MA 02062-9106, : Fax: 2000 2009 analog devices , Inc. All rights reserved. FEATURES High Speed 350 MHz, 3 dB bandwidth 1200 V/ s slew rate Resistor set gain Internal common-mode feedback Improved gain and phase balance: 68 dB @ 10 MHz Separate input to set the common-mode output voltage Low distortion: 99 dBc SFDR @ 5 MHz, 800 load Low power: mA @ 5 V Power supply range: + V to V Fully AEC-Q100 qualified (AD8132W) APPLICATIONS Low power Differential ADC drivers Differential gain and Differential filtering Video line drivers Differential in/out level shifting Single-ended input to Differential output drivers Active transformers Automotive driver assistance Automotive infotainment GENERAL DESCRIPTION The AD8132 is a low cost Differential or single-ended input to Differential output Amplifier with resistor set gain.

3 The AD8132 is a major advancement over op amps for driving Differential input ADCs or for driving signals over long lines. The AD8132 has a unique internal feedback feature that provides output gain and phase matching balanced to 68 dB at 10 MHz, suppressing harmonics and reducing radiated EMI. Manufactured using the next-generation of analog devices , Inc., XFCB bipolar process, the AD8132 has a 3 dB bandwidth of 350 MHz and delivers a Differential signal with 99 dBc SFDR at 5 MHz, despite its low cost. The AD8132 eliminates the need for a transformer with high performance ADCs, preserving the low frequency and dc information.

4 The common-mode level of the Differential output is adjustable by applying a voltage on the VOCM pin, easily level shifting the input signals for driving single-supply ADCs. Fast overload recovery preserves sampling accuracy. CONNECTION DIAGRAM IN1 VOCM2V+3+OUT4+IN8NC7V 6 OUT5NC = NO CONNECTAD813201035-001 Figure 1. The AD8132 is also used as a Differential driver for the trans-mission of high Speed signals over low cost twisted pair or coaxial cables. The feedback network can be adjusted to boost the high frequency components of the signal. The AD8132 is used for either analog or digital video signals or for other high Speed data trans-mission.

5 The AD8132 is capable of driving either a Category 3 or Category 5 twisted pair or coaxial cable with minimal line attenuation. The AD8132 has considerable cost and performance improvements over discrete line driver solutions. Differential signal processing reduces the effects of ground noise that plagues ground-referenced systems. The AD8132 can be used for Differential signal processing (gain and filtering) throughout a signal chain, easily simplifying the conversion between Differential and single-ended components. The AD8132W is the automotive grade version, qualified for 125 C operation per the AEC-Q100.

6 See the Automotive Products section for more details. The AD8132 is available in both 8-lead SOIC and 8-lead MSOP packages for operation over the extended industrial temperature range of 40 C to +125 C. FREQUENCY (MHz)61 GAIN (dB)30 3 6 9 12101001kVS = 5VG = +1VO, dm = 2V p-pRL, dm = 499 01035-002 Figure 2. Large Signal Frequency Response AD8132 Rev. I | Page 2 of 32 TABLE OF CONTENTS Features .. 1 Applications .. 1 General Description .. 1 Connection Diagram .. 1 Revision History .. 3 Specifications .. 4 DIN to OUT Specifications .. 4 VOCM to OUT Specifications.

7 5 DIN to OUT Specifications .. 6 VOCM to OUT Specifications .. 7 DIN to OUT Specifications .. 8 VOCM to OUT Specifications .. 8 Absolute Maximum Ratings .. 9 Thermal Resistance .. 9 Maximum Power Dissipation .. 9 ESD Caution .. 9 Pin Configuration and Function Descriptions .. 10 Typical Performance Characteristics .. 11 Test Circuits .. 20 Operational Description .. 21 Definition of Terms .. 21 Basic Circuit Operation .. 21 Theory of Operation .. 22 General Usage of the AD8132 .. 22 Differential Amplifier Without Resistors (High Input Impedance Inverting Amplifier ).

8 22 Other 2 = 1 Circuits .. 23 Varying 2 .. 23 1 = 23 Estimating the Output Noise Voltage .. 23 Calculating Input Impedance of the Application Circuit .. 24 Input Common-Mode Voltage Range in Single-Supply Applications .. 24 Setting the Output Common-Mode Voltage .. 24 Driving a Capacitive Load .. 24 Open-Loop Gain and Phase .. 24 Layout, Grounding, and Bypassing .. 25 Circuits .. 25 Applications Information .. 26 analog -to-Digital Driver .. 26 Balanced Cable Driver .. 26 Transmit Equalizer .. 27 Low-Pass Differential Filter .. 27 High Common-Mode Output Impedance Amplifier .

9 28 Full-Wave Rectifier .. 29 Automotive Products .. 29 Outline Dimensions .. 30 Ordering Guide .. 30 AD8132 Rev. I | Page 3 of 32 REVISION HISTORY 9/09 Rev. H to Rev. I Changes to Figure 64 Caption .. 21 5/09 Rev. G to Rev. H Changes to Features Section, Applications Section, and General Description Section .. 1 Changes to Table 1 .. 4 Changes to Table 2 .. 5 Changes to Table 3 .. 6 Changes to Table 4 .. 7 Added Automotive Products Section .. 29 Changes to Ordering Guide .. 30 1/09 Rev. F to Rev. G Changes to Figure 77 .. 26 Updated Outline Dimensions.

10 29 11/06 Rev. E to Rev. F Updated Format .. Universal Changes to Table 1 .. 3 Changes to Table 4 .. 6 Changes to Table 5 .. 7 Changes to Ordering Guide .. 29 11/05 Rev. D to Rev. E Changes to Table 7, Thermal Resistance Section, Maximum Power Dissipation Section, and Figure 3 .. 8 Changes to Ordering Guide .. 29 12/04 Rev. C to Rev. D Changes to General Description .. 1 Changes to Specifications .. 2 Changes to Absolute Maximum 8 Updated Outline Dimensions .. 29 Changes to Ordering Guide .. 29 2/03 Rev. B to Rev. C Changes to Specifications .. 2 Addition to Estimating the Output Noise Voltage Section.