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Amplifiers Selection Guide

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Amplifiers Selection Guide 0101_Price 1/6/03 3:37 PM Page 1 TM R EAL W ORLD S IGNAL P ROCESSING Amplifier Selection Guide 1Q 2003 Power Operational Amplifiers Pulse Width Modulation Drivers Voltage-Controlled Gain Integrating Logarithmic Isolation High Speed Operational Amplifiers 4-20 mA Transmitters Audio Difference and Comparators Instrumentation Digitally Programmable Gain Includes 0101_Price 1/6/03 3:37 PM Page 2 Amplifier Selection Tree Power Management REF REF Amp ADC Processor DAC Amp Operational Amplifiers Voltage-Controlled Gain Operational Amplifie (GBW < 50 MHz) page 25 (GBW < 50 MHz) pages 4-12 pages 4-12 High Speed High Speed 4-20 mA Transmitters (GBW ≥ 50 MHz) pages 13-16 page 33 pages 13-16 Comparators Logarithmic Audio pages 17-18 page 34 pages 26-30 Difference and Power and Buffers Integrating Instrumentation page 31 page 35 pages 19-23 (Galvanic) Isolation Pulse Width Digitally page 36 Modulation Drivers Programmable Gain page 32 page 24 2 Amplifier Selection Guide Texas Instruments 1Q 2003 0101_Price 1/6/03 3:37 PM Page 3 Introduction and Table of Contents Operational Amplifiers Overview . 4-5 Texas Instruments offers a wide range Precision . .6-7 of amplifiers that vary in performance, Low-Voltage . .7-8 functionality and technology. Whether Low-Power . 9 your design requires low-noise, high- Wide-Voltage Range . 10-11 precision or low-voltage micropower General Purpose . .11 signal conditioning, TI’s amplifier portfolio will meet your requirements High-Speed Amplifiers . 13-16 and with a variety of micropackage options. Comparators . 17-18 Why TI Amplifiers? Difference Amplifiers . 19-20 • High performance—maximum performance, minimum power. Instrumentation Amplifiers • Largest portfolio of op amps in Overview . 21 the industry. Single-Supply . 22 • Cost-efficient signal conditioning Dual-Supply . 23 solutions. • Maximize your signal chain Digitally Programmable Gain Amplifiers . 24 performance. Voltage-Controlled Gain Amplifiers . 25 TI offers devices useful anywhere analog applications require: Audio Amplifiers • High reliability Overview . 26-27 • Precision Audio Power Amplifiers . 28-29 • Wide dynamic range General Audio . 30 • Wide bandwidth • Wide temperature range Power Amplifiers and Buffers . 31 • Stability over time Pulse Width Modulation Drivers . 32 Recently Released Products • OPA363—1.8 V, RRIO, low noise, 4-20 mA Transmitters . 33 excellent CMRR. • OPA335—zero-drift, low-power, Logarithmic Amplifiers . 34 CMOS amplifier. • OPA354—100-MHz, RRIO, CMOS Integrating Amplifiers . 35 amplifier family. • OPA356—200-MHz, RRO, CMOS Isolation Amplifiers . 36 amplifier family. • OPA348—1-MHz, 45-µA, RRIO, Resources CMOS amplifier family. Technology Primer . 37 • SC70 package now available for OPA348, OPA349, OPA347. Evaluation Modules . 37 • TPA2005—1.1-W, mono, Class-D, filter-free, audio power amplifier. Application Reports . 38 • LOG2112—dual version of the LOG112 with 7.5 decades of FilterPro™ Design Tool . 39 dynamic range. • TLV349x—1.8-V, high-speed, low- Worldwide Technical Support . 39 power, push-pull comparator. • INA330—thermistor signal amp for temperature control. 1Q 2003 Texas Instruments Amplifier Selection Guide 3 0101_Price 1/6/03 3:37 PM Page 4 Operational Amplifiers Texas Instruments offers a wide range of op amp types including high Common Op Amp Design Questions What is the amplitude of the input Does the power supply voltage vary? precision, micropower, low voltage, high signal? To ensure that signal errors are Power supply variations affect the offset speed and rail-to-rail in several different small relative to the input signal, small voltage. This may be especially impor- process technologies. TI has developed the input signals require high precision, tant in battery-powered applications. industry's largest selection of low power (e.g. low offset voltage) amplifiers. and low voltage op amps with features Ensure that the amplified output signal Precision Application Examples designed to satisfy a very wide range of stays within the amplifier output voltage. • High gain circuits (G > 100) appplications. To help facilitate the selec- • Measuring small input signals tion process, an interactive online op amp Will the ambient temperature vary? (i.e. from a thermocouple) parametric search engine is available at Op amps are sensitive to temperature • Wide operating temperature range amplifier.ti.com/search with links to all variations, so it is often to consider circuits (i.e. in automotive or industrial op amp specifications. offset voltage drift over temperature. applications) ≤ Design Considerations • Single-supply 5-V data-acquisition Does the common-mode voltage systems where input voltage span is Choosing the best op amp for an applica- vary? Make sure the op amp is operated limited tion involves consideration of a variety within its common-mode range and has of interrelated requirements. In doing so, an adequate common-mode rejection designers must trade-off often conflicting ratio (CMRR). Common-mode voltage size, cost and performance objectives. will induce additional offset voltage. Even experienced engineers can find the task daunting but it need not be. Keeping in mind the following issues, the choice can and CMRR. It is generally used to describe require much wider bandwidth to achieve quickly be narrowed to a manageable few. op amps with low input offset voltage low distortion, excellent linearity, good gain and low input offset voltage temperature accuracy, gain flatness or other behavior Supply voltage (VS)—tables include low- drift. Precision op amps are required when that is influenced by feedback factors. voltage (< 2.7 V min) and wide voltage amplifying tiny signals from thermocouples range (> 5 V min) sections. Other op amp and other low-level sensors. High-gain Power (IQ requirements)—a significant selection criteria (e.g. precision) can be or multi-stage circuits may require low issue in many applications. Because quickly examined in the supply range offset voltage. op amps can have a considerable impact column for an appropriate choice. Applic- on the overall system power budget, ations operating from a single power Gain-bandwidth product (GBW)—the gain quiescent current, especially in battery- supply may require rail-to-rail performance bandwidth of a voltage-feedback op amp powered applications, is a key design and consideration of precision-related determines its useful bandwidth in an consideration. parameters. application. The available bandwidth is approximately equal to the gain bandwidth Rail-to-rail performance—rail-to-rail output Precision—primarily associated with divided by the closed-loop gain of the provides maximum output voltage swing input offset voltage (VOS) and its change application. For voltage feedback ampli- for widest dynamic range. This may be with respect to temperature drift, PSRR fiers, GBW is a constant. Many applications particularly important with low operating Recommended Recommended Supply Voltage Design Requirements Typical Applications Process TI Amp Family ≤ VS 5 V Rail-to-Rail, Low Power, Precision, Battery-Powered, Handheld CMOS OPA3xx, TLVxxxx Small Packages ≤ VS 16 V Rail-to-Rail, Low Noise, Low Voltage Offset, Industrial, Automotive CMOS OPA3x, TLCxxxx, Precision, Small Packages OPA7xx ≤ VS +36 V Low Input Bias Current, Low Offset Current, Industrial, Test Equipment, ONET, High-end Audio FET, DiFET OPA1xx, OPA627 High Input Impedance ≤ VS +44 V Low Voltage Offset, Low Drift Industrial, Test Equipment, ONET, High-end Audio Bipolar OPA2xx, TLExxxx ±5 V to ±15 V High Speed on Dual Supplies XDSL, Video, Professional Imaging, DiFET, High-Speed OPA6xx*, Dual Supply Data Converter Signal Conditioning Bipolar, BiCOM THSxxxx* ≤ ≤ 2.7 V VS 5 V High Speed on Single Supply Consumer Imaging, Data Converter Signal High-Speed CMOS OPA35x, OPA6xx*, Single Supply Conditioning, Safety-Critical Automotive THSxxxx* *See high-speed section, page 13. 4 Amplifier Selection Guide Texas Instruments 1Q 2003 0101_Price 1/6/03 3:37 PM Page 5 Operational Amplifiers Op Amp Naming Conventions Op Amp Rapid Selector Channels The tables on the following pages Single = No Character Amp Class Dual = 2 TLV = Low Supply Voltage have been divided and subdivided Triple = 3 TLC = 5 V CMOS into several categories to help quickly Quad = 4 TLE = Wide Supply Voltage narrow the alternatives. OPA y 3 63 TLV 278 x Precision VOS ≤ 500 µV Base Model Channels And Shutdown Options Low Noise . pg 6 100 = FET 0 = Single With Shutdown ≤ 200 = Bipolar 1 = Single VN 10nV/ Hz 300 = CMOS (≤ 5.5V) 2 = Dual Low Voltage . pg 6 400 = High Voltage (> 40 V) 3 = Dual With Shutdown ≤ 500 = High Power (> 200 mA) 4 = Quad VS 2.7 V 600 = High Speed (> 50 MHz) 5 = Quad With Shutdown Low Power . pg 6 700 = CMOS (12 V) IQ ≤ 1 mA/ch Low Input Bias Current . pgs 6-7 I ≤ 100 pA voltage where signal swings are limited. Package size—TI offers a wide variety of B Wide Bandwidth . pg 7 Rail-to-rail input capability is often required micropackages, including SOT23 and GBW ≥ 5 MHz to achieve maximum signal swing in SC70 and small, high power-dissipating buffer (G = 1) single-supply applications. PowerPAD™ packages to meet space- Low Voltage V ≤ 2.7 V It can be useful in other applications, sensitive and high-output drive require- S Low Input Bias Current . pg 7 depending on amplifier gain and biasing ments. Many TI single channel op amps I ≤ 100 pA considerations. are available in SOT23, with some dual B Low Power . pg 8 amplifiers in SOT23-8. I ≤ 1 mA/ch Voltage noise (V )—amplifier-generated Q n Wide Gain Bandwidth . pg 8 noise may limit the ultimate dynamic Shutdown mode—an enable/disable GBW ≥ 5 MHz range, accuracy or resolution of a system. function that places the amp in a high Low-noise op amps can improve accuracy impedance state, reducing quiescent Low Power I ≤ 1 mA/ch even in slow DC measurements. current in many cases to less than 1 µA. Q Low Voltage . pg 9 Allows designers to use wide bandwidth V ≤ 2.7 V Input bias current (I )—can create offset op amps in lower power apps.
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