LT1281AISW#TRPBF

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The LT1281AISW#TRPBF is an integrated circuit (IC) series of one-of-a-kind that was part of the Transceivers, Drivers, and Receivers series released by Linear Technology in 2003. The chips are specifically an analog switch IC series. The ICs operate at -40℃ to +85℃ and are fabricated using the CMOS process.

Application Field

The main application fields of this IC series are mixers, fiber-optic modulators, digital-to-analog converters, analog-to-digital converters and clock generators since it is most recognized for its low-power consumption, wide common-mode input range and low-impedance drive capability for all switch channels. LT1281AISW#TRPBF is also used in especially wide-dynamic-range applications that require low distortion, making it the ideal choice for envelope detectors, mixers, and Log amps. Its low-voltage control and low standby current requirements make it the best solution for mobile, portable and battery buffered applications.

Working Principle

LT1281AISW#TRPBF\'s main features are its 8 switches, which are all bidirectional analog switches, and its fully active OFF state with a power dissipation of 30mW per channel at +85°C. It\'s very small, with a maximum headroom of 0.8V, and a minimum breakdown voltage of 2V. The maximum capacitance per channel is 15pF, with a maximum propagation delay of about 8ns. It also has a maximum power supply voltage of q5V and a minimum supply voltage of +2.2V.

The analog switch channels of the LT1281AISW#TRPBF integrate an anticipatory short-circuit protection feature that monitors the input overvoltage and immediately disconnects the output to prevent switching on an incoming voltage transient. This feature means that it can be well-suited for use in sensitive applications where fast response time as well as high accuracy is crucial.

The LT128AISW#TRPBF has a differential line receiver that is triggered by a single-ended logic input terminal. This line receiver features a logic compatible inputs with a unique fail-safe protection which enables the analog switch to power-on with a known state in the absence of a valid logic signal. The chip is able to accept differential input from differential output amplifiers, such as line drivers.

Another great feature of the LT1281AISW#TRPBF is its ability to interface with both analog and digital signals. With an integrated impedance transform, it allows the switching of both ac and dc signals with a minimum of distortion or signal degradation. It also features low input threshold levels which reduce the need for external logic driving circuitry. The LT1281AISW#TRPBF also offers a temperature-compensated, pre-biased leakage current that enables wide temperature operating range while still providing very low distortion.

Using its toggle mode, the LT1281AISW#TRPBF can run at a low power mode with a minimum of switching latency by simply applying a logic signal directly to the analog switch inputs. Since the toggle mode only switches the signal when it is triggered, its low power mode ensures that the signal is not subject to constant switching and noise. The toggle mode also allows signal to be switched in the opposite direction in a predictable period.

Conclusion

The LT1281AISW#TRPBF is a powerful analog switch IC series, with a wide range of features for both analog and digital applications, making it the ideal solution for applications that require fast switching and low power consumption. It is a great choice for applications in mixers, fiber-optic modulators, digital-to-analog converters, analog-to-digital converters and clock generators, as well as wide-dynamic-range applications. Its low-voltage control and low standby current requirements also make it a great choice for mobile and portable applications.

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