LTC2051IDD#PBF

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Analog Devices, Inc.’s LTC2051IDD#PBF (hereafter referred to as LTC2051IDD) is a family of low power, high linearity, low noise and wide temperature range single/dual instrumentation amplifiers. It is designed to meet the performance requirements of a variety of Linear-Amplifiers-Instrumentation, OP Amps, Buffer Amps applications. In this application note, an overview of the LTC2051IDD features and architecture along with a description of its working principle will be provided.

LTC2051IDD Features

The LTC2051IDD family provides wide bandwidth, high common-mode rejection, very low input bias current, excellent linearity and low noise figure, making them ideal for a wide range of sensing applications. For example, they can be used as part of a variety of measuring and testing instruments such as thermometers, AC/DC voltmeters, bridge amplifiers, and displacement, flow, and force transducers. Other features of the LTC2051IDD include:

• Low input offset voltage: typically 0.79 μV max
• Low input noise voltage: typically 2.2 nV/√Hz at 10 kHz
• Wide gain range of 1 to 10,000
• Wide dynamic range: typically >90dB
• High DC precision: typically 0.2% Typ Max
• Wide supply range: ±2.5V to ±18V
• Integrated high-performance output drivers
• Power supply management that results in ultra-low power consumption

LTC2051IDD Architecture

The LTC2051IDD is a fully integrated Amplifier-Opamp-Buffer with a high performance output buffer. The basic architecture is a dual CMOS amplifier (analog input side), the first stage of which is used as a level shifter, followed by an Opamp, and then a low offset voltage feedback loop buffered by the output stage. The CMOS amplifier’s level shifter is used to set the nominal input range from common-mode to a higher common-mode voltage, allowing for low noise operation.

The input stage consists of two CMOS amplifiers, A1 and A2, and a voltage divider network, R2 and R3, which provide a wide common-mode range for operation. The inputs receive a signal from the differential input, which is translated by a low offset voltage. The output of the amplifier is then fed to the gain setting pins, where the gain can be adjusted to provide the desired response.

The gain-setting pins allow the output swing to be set to a desired voltage range. This is accomplished by driving the gain-setting pins (GAI and GAO) with a potentiometer that is connected to the total available voltage at the output swing. The gain is then set by adjusting the setting pins to the desired gain.

Finally, the output stage buffers the output of the amplifier, providing a low output impedance that is useful for driving long cables and loads. The output buffer translates the amplified signal from the amplifier to the output, combining high linearity and excellent load drive capability.

LTC2051IDD Working Principle

The LTC2051IDD works on the principle of a differential amplifier, which is a combination of a voltage divider network and an operational amplifier. The differential amplifier amplifies the difference between two input signals and then applies the amplified signal to the output buffer. As the input signal changes, the differential amplifier modifies the difference between the two input signals and generates an amplified output signal.

The gain of the differential amplifier is determined by the feedback loop between the operational amplifier, the resistance of the resistor network, and the gain-setting pins. As the gain setting pins are adjusted, the differential amplifier adjusts the gain in order to generate an amplified output signal. The gain of the amplifier varies depending on the gain settings. As the gain is increased, the signal is amplified to a greater degree.

Finally, the output buffer amplifies the difference between the two input signals in order to generate a low output impedance that can be used for driving long cables and loads. The output buffer also translates the amplified signal from the amplifier to the output, combining high linearity and excellent load drive capability.

Conclusion

The LTC2051IDD family is a low power, high linearity, low noise and wide temperature range single/dual instrumentation amplifiers. They are designed to meet the performance requirements for a variety of Linear-Amplifiers-Instrumentation, OP Amps, Buffer Amps applications with features such as low input offset voltage, low input noise voltage, wide gain range, wide dynamic range, and high DC precision. The LTC2051IDD is an ideal solution for a wide range of sensing applications such as thermometers, AC/DC voltmeters, bridge amplifiers, and displacement, flow, and force transducers.

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