LM6171BIN

Current - Input Bias:	1µA
Base Part Number:	LM6171
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	5.5 V ~ 34 V, ±2.75 V ~ 17 V
Current - Output / Channel:	116mA
Current - Supply:	2.5mA
Voltage - Input Offset:	1.5mV
Series:	VIP™ III
-3db Bandwidth:	160MHz
Gain Bandwidth Product:	100MHz
Slew Rate:	3600 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	Voltage Feedback
Part Status:	Obsolete
Packaging:	Tube

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LM6171BIN Application Field and Working Principle
The LM6171BIN is an instrumentation amplifier suitable for numerous applications within the linear amplifiers, instrumentation, OP amps, buffer amp categories. This product is a single-ended, dual-stage instrumentation amplifier with rail-to-rail input and output functionality. It is commonly used in industrial process control systems, medical instruments and portable measurement devices, as well as electrical and electronic systems requiring high accuracy.
The LM6171BIN is an amplifier optimized for maximum output swing and minimum noise. It uses a dual-stage topology combined with a low impedance output buffer to provide rail-to-rail input and output common-mode and power supply range. The noise-optimized output transistor has an excellent voltage noise performance of 15 nV/sqrt Hz, providing a clean output voltage suitable for A/D conversions and high sensitivity applications.
At the heart of the LM6171BIN amplifier is its dual-stage topology. It consists of two distinct amplifying paths, each composed of an operational amplifier (op-amp) stage and an output transistor stage. The first op-amp is designed to provide voltage gain of up to 15dB and a wide bandwidth. This stage filters out noise and increases the output swing. It is followed by a second op-amp, the output transistor stage, which provides additional gain and serves to shape the output waveform.
The input stage of the LM6171BIN is a follower topology, meaning that its output is simply a copy of the input. This essentially means that the amplifier is set to unity gain, providing better noise performance and excellent input common-mode range. This stage uses two additional voltage follower stages as input protection for extreme signals, as well as for additional noise reduction. This protection stage also allows the compensated input stage to be used as a voltage follower with a much lower noise performance than that of a conventional amplifier.
The output stage is an emitter-coupled logic (ECL) topology, where the output transistor is connected in the common-emitter mode to the output buffer. This stage provides the majority of the gain, up to 15dB. The output of this stage is then sent to the output buffer, whose output is then connected to the output of the LM6171BIN. The buffer provides both the output current and the buffer voltage necessary to achieve rail-to-rail voltage swings. The output voltage can be driven up to the desired level, up to the supply rails, without saturating the output buffer.
In summary, the LM6171BIN is a dual-stage instrumentation amplifier suitable for numerous applications within the linear amplifiers, instrumentation, OP amps, buffer amp categories. This product is optimized for maximum output swing and minimum noise and uses a dual-stage topology, combined with a low impedance output buffer, to provide rail-to-rail input and output common-mode and power supply range. The input stage is a follower topology and the output stage is an ECL topology. Together, they provide a very low noise level, allowing the LM6171BIN amplifier to be used in a variety of applications requiring high accuracy.

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