This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Part Number: LM2901
For one of my designs, I need to design a variable gain amplifier, which will give out 500HZ sine wave with maximum amplitude 45V and minimum 0.1V.
The input to the amplifier is a 500HZ, 0 to 40V AC signal with constant amplitude of 40V.
The gain must be controlled by a processor as shown in below image ( both analog or digital control like I2C, SPI are okay).
The gain must be varied such that output amplitude will vary with 0.1V steps.
Please suggest me how to implement this kind of circuitry.
Thanks in advance.
TI doesn't offer any ampifier products that will directly accomplish your high voltage, voltage-controlled amplifier (VCA) function. There are a few low-voltage VCA products such as VCA810 and VCA820, but these are intended for use with low-voltage supplies and comparable signal voltage levels. The high-voltage input voltage levels would have to be attenuated to use these devices. Then the output signal would have to be amplified with a high-voltage op amp such as the OPA454 to raise the amplitude to the needed output levels.
The VCA810 and VCA820 are supported by TI's High-Speed Amplifiers group, while the OPA454 is supported by this Precision Amplifiers group.
Precision Amplifiers Applications Engineering
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.