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Forstærker til applikationer med høje common-mode spændinger

Texas Instruments introducerer højpræcisions forstærker til typisk industriapplikationer med høje commen-mode spændinger (in english).

Texas Instruments has introduced what the company claims is the industry’s most accurate difference amplifier for high common-mode voltage applications up to +275 V. With a best-in-class common-mode rejection ratio (CMRR) of 100 dB, the INA149 increases overall measurement accuracy by 2x compared to the competition and is the first high-voltage difference amplifier with a specified minimum 90-dB CMRR performance in harsh, high-temperature environments up to 125 degrees C.

The amplifier also lowers initial gain error by 33 percent compared to the competition, while providing twice the slew rate to increase response time and overall system performance.


- The INA149 offers the highest precision measurement of low differential signals in industrial designs, which means higher performing, more accurate products for our customers, says Steve Anderson, senior vice president of TI’s High Performance Analog business.

- The device also eliminates the need for multiple isolators or power supplies in high common-mode voltage applications to reduce component count, improve reliability and simplify system design.

The INA149 can be used in a variety of high common-mode-voltage applications, such as high-voltage current sensing; battery cell voltage monitoring in photovoltaic, telecom, electric vehicles, and alternative energy applications; power-supply current monitoring; and motor control.

Key features and benefits of the INA149:
• 100-dB CMRR with a specified minimum CMRR of more than 90 dB throughout the industrial temperature range of -40 degrees C up to 125 degrees C increases overall measurement accuracy more than two-fold compared to the closest competitor.
• Extended input common-mode-voltage from -275 V to +275 V enables accurate monitoring of signals riding in high common-mode voltages, eliminating the need for multiple supply sources and analog isolation components to interface to an analog-to-digital converter (ADC).
• Twice the slew rate and full-power bandwidth of its closest competitor for applications where abrupt changes, such as short circuit conditions, are monitored and corrective actions need to be commanded quickly. The faster response and wider large-signal bandwidth of 500 kHz increases system performance.
• Lower maximum initial gain error of 0.02 percent provides better accuracy, especially in applications with lower common-mode voltage signals.

TI offers a variety of tools and support to speed development with the INA149, including an evaluation module (INA149EVM) and a TINA-TI SPICE model to simulate device performance.

The INA149 is available today in a 4.9-mm x 6-mm SOIC package.
For more information and to order samples or evaluation modules, visit www.ti.com/ina149-preu.

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