LT2178CS8#PBF

Current - Input Bias:	3nA
Base Part Number:	LT2178
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply, Single/Dual (±):	2.2 V ~ 36 V, ±1.1 V ~ 18 V
Current - Supply:	17µA
Voltage - Input Offset:	90µV
Series:	--
Gain Bandwidth Product:	85kHz
Slew Rate:	0.04 V/µs
Output Type:	--
Number of Circuits:	2
Amplifier Type:	General Purpose
Part Status:	Active
Packaging:	Tube

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LT2178CS8#PBF Application Field and Working Principle

Overview

LT2178CS8#PBF is a component used in linear-amplifier, instrumentation OpAmps, and Buffer Amps applications. It is a precision low-power single-ended high-speed current feedback amplifier which takes the form of an 8-pin through hole surface-mounted device (SMD). As such it can be used to provide high-speed operation with low frequency distortion, while still providing the dynamic range required by the application.

Application Fields

LT2178CS8#PBF component is employed in a variety of applications, from providing efficient and low-power amplification of audio signals to providing low-distortion wideband amplifier solutions for instrumentation OpAmps and buffer applications. It is well suited for applications requiring high dynamic range and wide bandwidth, such as those found in professional audio, communications, and instrumentation projects. The LT2178CS8#PBF component provides current feedback from the Output stage to the Input stage, allowing for linear amplification of signal, remaining within the specified common-mode and differential-mode signal range (4-32V). The component is also capable of providing a rail-to-rail signal update with minimal slew-rate degradation, allowing for a broader signal response range.In addition, the component is also well suited for driving long wires and other capacitive loads, providing additional low signal distortion and signal-response accuracy. A special voltage feedback configuration is available to minimize the effect of long wires and other external impedance on the signal response.Finally, the component is able to maintain its dynamic range and high-speed capabilities despite having a wide input common-mode voltage range (2.5V to 30V), normally associated with low-speed amplifiers.

Working Principle

The LT2178CS8#PBF component consists primarily of two main stages: the input and output stages. The input stage is a transconductance amplifier. This is a type of amplifier which provides an output voltage in response to an input current, instead of an input voltage. The input stage amplifier is designed to be highly linear and is configured as a voltage-controlled current source.The output of the input stage is then fed to a complementary emitter follower. This is a differential amplifier configuration, which acts as an operational amplifier, providing large currents to the output of the device, proportional to the small current at the input. This is where the power gain of the device is established by the ratio of the current gains of the two stages.The output stage is then connected to an output buffer, which provides an output voltage proportional to the input voltage, without any feedback. This output buffer provides the high gain of the device and is where the high speed response of the device is found.

Conclusion

The LT2178CS8#PBF component is a low power, single-ended, high-speed current feedback amplifier capable of providing high dynamic range and wide bandwidth in linear-amplifier, instrumentation OpAmps, and buffer applications. The component is configured with input and output stages, utilizing a transconductance amplifier and complementary emitter follower to provide large currents to the output, while the output buffer provides the high gain of the device and its high speed response. The component also provides a rail-to-rail signal update with minimal slew-rate degradation, allowing for a broader signal response range.

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