Datasheet AD8132 (Analog Devices)

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Low Cost, High Speed Differential Amplifier AD8132 FEATURES CONNECTION DIAGRAM High speed AD8132 –IN 8 +IN 350 MHz, −3 dB bandwidth 1 VOCM 2 7 NC 1200 V/μs slew rate V+ 3 6 V– Resistor set gain +OUT 4 5 –OUT
01 0
Internal common-mode feedback
5-
NC = NO CONNECT
03 01
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 Ω 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
Power supply range: +2.7 V to ±5.5 V
cables. The feedback network can be adjusted to boost the high
Fully AEC-Q100 qualified (AD8132W)
frequency components of the signal. The AD8132 is used for either analog or digital video signals or for other high speed data trans-
APPLICATIONS
mission. The AD8132 is capable of driving either a Category 3 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.
GENERAL DESCRIPTION
The AD8132W is the automotive grade version, qualified for 125°C 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 is a major advancement over op amps for driving differential input The AD8132 is available in both 8-lead SOIC and 8-lead MSOP ADCs or for driving signals over long lines. The AD8132 has a packages for operation over the extended industrial temperature unique internal feedback feature that provides output gain and range of −40°C to +125°C. phase matching balanced to −68 dB at 10 MHz, suppressing
6
harmonics and reducing radiated EMI.
VS = ±5V G = +1 3 VO, dm = 2V p-p
Manufactured using the next-generation of Analog Devices, Inc.,
RL, dm = 499Ω
XFCB bipolar process, the AD8132 has a −3 dB bandwidth of
0
350 MHz and delivers a differential signal with −99 dBc SFDR
) B
at 5 MHz, despite its low cost. The AD8132 eliminates the need for
d ( –3
a transformer with high performance ADCs, preserving the low
IN GA
frequency and dc information. The common-mode level of the
–6
differential output is adjustable by applying a voltage on the VOCM pin, easily level shifting the input signals for driving single-
–9
supply ADCs. Fast overload recovery preserves sampling accuracy.
–12
02
1 10 100 1k
0 5-
FREQUENCY (MHz)
03 01 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 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2000–2009 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION CONNECTION DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ±DIN TO ±OUT SPECIFICATIONS VOCM TO ±OUT SPECIFICATIONS ±DIN TO ±OUT SPECIFICATIONS VOCM TO ±OUT SPECIFICATIONS ±DIN TO ±OUT SPECIFICATIONS VOCM TO ±OUT SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS OPERATIONAL DESCRIPTION DEFINITION OF TERMS Differential Voltage Common-Mode Voltage BASIC CIRCUIT OPERATION THEORY OF OPERATION GENERAL USAGE OF THE AD8132 DIFFERENTIAL AMPLIFIER WITHOUT RESISTORS (HIGH INPUT IMPEDANCE INVERTING AMPLIFIER) OTHER β2 = 1 CIRCUITS VARYING β2 β1 = 0 ESTIMATING THE OUTPUT NOISE VOLTAGE CALCULATING INPUT IMPEDANCE OF THE APPLICATION CIRCUIT INPUT COMMON-MODE VOLTAGE RANGE IN SINGLE-SUPPLY APPLICATIONS SETTING THE OUTPUT COMMON-MODE VOLTAGE DRIVING A CAPACITIVE LOAD OPEN-LOOP GAIN AND PHASE LAYOUT, GROUNDING, AND BYPASSING CIRCUITS APPLICATIONS INFORMATION ANALOG-TO-DIGITAL DRIVER BALANCED CABLE DRIVER TRANSMIT EQUALIZER LOW-PASS DIFFERENTIAL FILTER HIGH COMMON-MODE OUTPUT IMPEDANCE AMPLIFIER FULL-WAVE RECTIFIER AUTOMOTIVE PRODUCTS OUTLINE DIMENSIONS ORDERING GUIDE