LT1787CMS8#TRPBF

The LT1787CMS8#TRPBF is a precise instrumentation amplifier with a low common-mode voltage range and adjustable gains from 2 to 100. It is the first amplifier to provide gain, bandwidth, common-mode voltage range, common-mode rejection ratio, power supply rejection ratio, and offset voltage accuracy all in a single package.

Application Field

The LT1787CMS8#TRPBF is widely used in the measurement and analysis of electrical signals, such as strain gauges, accelerometers, flow meters, and other transducers, as well as process control systems and communications circuits. It is also suitable for use with standard off-the-shelf test and measurement equipment such as oscilloscopes and are used across many industries including medical, automation, and instrumentation. Additionally, they are used to provide electrical isolation between high levels of current or AC line voltages and sensitive circuitry.

Working Principle

The LT1787CMS8#TRPBF combines a low-noise differential input stage with a differential amplifier for precise gain control and stable performance. The user can adjust gains from 2 to 100 according to the application needs. The amp also provides high common-mode voltage range, offering up to +25 V above and -25 V below the ground pin. It has an outstanding common-mode rejection ratio (CMRR) of 136 dB at 2 kHz, able to reject noise and other common-mode interference from the device’s vicinity. The amplifier’s power supply rejection ratio (PSRR) is 140 dB typ. at 1 kHz, which helps reduce power supply noise on the output when it is affected by the power supply.

The LT1787CMS8#TRPBF’s offset voltage accuracy is typically less than 0.1mV which is extremely low for an instrumentation amplifier. The amp is available in an 8-pin MSOP package which enables tight current sharing between legs, significantly improving the PSRR and CMRR performance as compared to an amp in an SO package.

Conclusion

The LT1787CMS8#TRPBF is an extremely precise instrumentation amplifier with adjustable gains, wide common-mode voltage range, low offset voltage, and high CMRR and PSRR. Thanks to its low noise and reliable performance, it is suitable for use in a wide range of applications requiring sensitive signal concentration.