LTC6256HTS8#TRMPBF

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LTC6256HTS8#TRMPBF: Application Field and Working Principle

LTC6256HTS8#TRMPBF is a type of Linear – Instrumentation, OP Amps, Buffer Amps. It’s designed as dual-channel ultra-low-noise difference amplifier is ideal for high resolution data acquisition systems such as bridge and strain gauge conditioning, low frequency lock-in amplifiers, and open-loop transimpedance applications. The product’s features, specifications and application information are listed below.

Features:

• Low noise of 4.2 nV/√Hz
• Wide bandwidth of 6 MHz
• High CMRR of 140 dB
• Rail-to-rail outputs
• 2.7V to 5.5V operation
• High output drive: ±350 mA
• Shutdown mode reduces quiescent current to 0.5 μA
• Power dissipation of 225 mW

Specifications:

• Operating voltage range: 2.7V to 5.5V
• Supply current: 8.5 mA/ch
• Open-loop gain: 130 v/mV
• Noise current: 4.2 nV/√Hz
• Gain-bandwidth product: 6 MHz
• Common-mode rejection ratio (CMRR): 140 dB

Applications:

• High resolution data acquisition systems such as bridge and strain gauge conditioning
• Low frequency lock-in amplifiers
• Open-loop transimpedance applications, such as pH monitors and transducers

Working Principle:

The LTC6256HTS8#TRMPBF is a precision, unity-gain stable, high-performance differential amplifier. Its dual-channel architecture provides low noise of 4.2 nV/√Hz and has a wide bandwidth of 6MHz. The amplifier has a high common-mode rejection ratio (CMRR) of 140dB and several improved features, including low gain drift, supply voltage flexibility, fast settling time, and increased output drive capability. The device features a power shutdown mode that reduces the supply current to just 0.5μA.

The differential amplifier is based on two matched unity-gain amplifiers, one inverting amplifier and one non-inverting amplifier, in a common-mode configuration. The two amplifiers are matched with nearly identical voltage gains, thus the difference between their output voltages is proportional to the difference between the two input voltages. The common-mode rejection ratio (CMRR) is increased by the factor of two by having the two amplifiers operate in a common-mode configuration.

The differential amplifier can also be used as an inverting amplifier, where the input signal is applied to the inverting terminal and the output is taken from the non-inverting terminal. The gain of the amplifier is determined by the feedback resistor and can be adjusted to any desired value. The amplifier has a high input impedance, making it well suited for buffering or isolating a low-impedance sensor.

The amplifier features supply voltage flexibility, allowing it to operate on any supply rail from 2.7V to 5.5V. It also has a high current drive capability, allowing it to drive capacitive loads up to 350mA without sacrificing performance or increasing noise.

The amplifier has a high common-mode rejection ratio (CMRR) of 140dB, which ensures that the differential amplification is unaffected by any common-mode disturbances on the input signal. It also has a wide bandwidth of 6MHz, making it ideal for high-frequency signal conditioning applications.

The amplifier features a power shutdown mode that reduces the supply current to just 0.5μA, making it ideal for battery-powered applications. The amplifier has a power dissipation of 225 mW, allowing it to be used in applications requiring high power supply current.

The LTC6256HTS8#TRMPBF is a precision, unity-gain stable, high-performance differential amplifier, ideal for high resolution data acquisition systems, low frequency lock-in amplifiers, and open-loop transimpedance applications.

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