Usually, when designing an integrated operational amplifier application circuit, it is not necessary to study the internal circuit of the operational amplifier, but to find a chip with corresponding performance indicators according to design requirements. Therefore, understanding the type of op amp and understanding the main performance of the op amp is the prerequisite for the correct choice of op amp. ——Excerpt from "Basic Analog Electronic Technology" (Tong Shibai, Hua Chengying)
There are many parameters for integrated op amps, so there are many types and models. How to select them has always been a headache for engineers. The type and model to be used in the circuit design should be determined according to the requirements of the system for the circuit. When the general purpose meets the requirements, the universal type should be used as much as possible because of its low price and easy purchase. A dedicated op amp is a higher-performance op amp. Its other performance metrics are not necessarily high. Sometimes it may even be lower than a general-purpose op amp. Pay attention to it when selecting it. In addition, in addition to meeting the main technical performance parameters, the performance price ratio should also be considered. Op amps with high performance indicators will also have higher prices. There are no special requirements when selecting, and general-purpose and multi-op amp type chips should be preferred.
TI operational amplifier type
ST operational amplifier type
ADI operational amplifier types
As shown in the figure, no matter which company has a wide variety of amplifiers
Amichai Ron, vice president and general manager of TI's amplifiers division, said that there are three ways to select amplifiers: "The first way, if engineers know the relevant parameters of the op amp they want to select, they can go through the input on TI's official website. The parameters quickly find the right op amp. In the second way, engineers can find the appropriate amplifier from the corresponding subsystem reference circuit by searching for related applications on TI's official website. The third way is also TI for engineers. We provide a very convenient way to search. Engineers can find the right op amp from our corresponding reference design for this application by searching the corresponding terminal application on the TI website."
Amichai Ron, Vice President and General Manager, TI Amplifier Products
Ron said: "We understand that choosing the right amplifier is very important for engineers, but it is very complicated, so on TI's official website we provide many ways to help engineers quickly find the right amplifier. They can filter through parameters, System Reference Circuit Search and Reference Design Search quickly find the right op amp on TI's website."
At present, in order to better develop the amplifier signal chain for engineers, TI has created some reference designs, selected some typical application scenarios, and used TI's best or most cost-effective op amps to form a typical application circuit. Ron introduced, "At present, TI provides 40 operational amplifiers and ADCs together to form a typical application circuit, including schematics, simulation results, etc. have been published on the official website. Engineers no longer have to think about how much the system solution will cost. Put the comparator and the comparator to build the system, because this is already the most optimized and cost-effective solution."
In addition, TI offers a range of value-added services for op amps, including numerous free tools, video tutorials, reference books, manuals, and more, as well as Tina-TI simulation software, and the Texas Instruments Chinese technical support community.
The amplifier is still improving
"Operational amplifiers have evolved relatively slowly and are not easily noticed. But TI is working to bring the performance of amplifiers to a higher level." Ron explained: "We see market demand for devices and integration. The demand for the degree is constantly increasing, not only for the processor, but also for the signal chain. Especially for the industrial, automotive and personal electronic products, the development of the amplifier has just begun, and in the future, TI will also go to the market. Introducing more and better amplifier products and expanding the product portfolio to provide customers with the best amplifiers for their systems."
The smallest operating amplifier - TLV9061
On February 6th TI introduced the world's smallest operational amplifier, the TLV9061, which is only 0.64mm2 and still maintains low power and high performance.
The TLV9061 op amp has three features: reduced system size and cost, high performance design, and higher DC accuracy.
TLV9061 features
In order to highlight the advantages of TLV9061, TI provides the corresponding reference design TIDA-01588, which can make full use of the advantages of this op amp. As shown in the figure, TIDA-01588 is used for brush DC servo drive board reference design up to 90 More than % efficiency.
The most important thing is the size of the coin.
Industry's smallest size comparator - TLV7011
Based on the TLV9061, TI has developed a series of comparators of the same size.
The performance is as shown:
It may not be remembered, but keep in mind that the power consumption of this product is 50% of similar products with the same reaction time.
Zero-Drift Power Amplifier - LPV821
Ron said that this is an "amplifier with ultra-high precision and very low power consumption", which can reduce power consumption by 60% and achieve higher precision through zero-drift technology.
LPV821 characteristics
TI has also developed an industrial 0-20mA sensor transmitter system based on the characteristics of the LPV821. Through the sensing node of the industrial field front end, the 4-20 mA current data state is transmitted to the remote control center. The main components of the system are the wireless sensing nodes composed of the LPV821 and the wireless MCU. "Because the current on the line is already low, it is necessary to draw power on the amplifier and MCU, and it will not affect the current value of the whole system, which has more stringent requirements on power consumption, size, and accuracy.
Ron said that TI's op amps have three main directions, including small size, low power consumption and high voltage. "Now most of the high voltage operation is below 36V, the higher the voltage battery efficiency will be higher, so for some systems, higher voltage is required. The current AGV trolley (automatic guided transport vehicle) battery needs more than 40V. Therefore, TI will launch a higher voltage op amp."
At the same time, Ron also stressed that the car is the direction and field that TI attaches great importance to. TI will pass most of the amplifiers to Q100 certification, enabling engineers to design reliable and flexible automotive systems while improving system life, maximizing efficiency and reducing costs.
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