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ADI LT1997IDF-3 Precision Wide Voltage Range Gain Selectable Amplifier

Shenzhen Mingjiada Electronics Co., Ltd, as a world-renowned authorised independent distributor of electronic components, is a long-term supplier of ADI LT1997IDF-3 high-precision, wide-voltage range gain-selective amplifiers. LT1997IDF-3, with its excellent accuracy, flexible gain configuration and wide operating voltage range, has demonstrated its strong technological competitiveness in the fields of industrial automation, test and measurement and medical equipment.

Product Overview Of LT1997IDF-3

LT1997IDF-3 combines a precision operational amplifier with highly-matched resistors to form a one-chip solution for accurately amplifying voltages. Gains from –13 to +14 with accuracy of 0.006% (60ppm) can be achieved using no external components. The LT1997IDF-3 is particularly well suited for use as a difference amplifier, where the excellent resistor matching results in a common mode rejection ratio of greater than 91dB.

The amplifier features a 60μV maximum input offset voltage and a -3dB bandwidth of 1.1MHz (Gain = 1). The LT1997IDF-3 operates from any supply voltage from 3.3V to 50V and draws only 350μA supply current. The output typically swings to within 100mV of either supply rail.

The resistors maintain their excellent matching over temperature; the matching temperature coefficient is guaranteed less than 1ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 2ppm.

The LT1997IDF-3 is fully specified at 5V and ±15V supplies and from –40°C to 125°C. The device is available in space saving 16-lead MSOP and 4mm × 4mm DFN14 packages.

Core Parameters Of LT1997IDF-3

Operating voltage range: ±2.5V to ±18V (5V to 36V from a single supply), this wide voltage range allows it to adapt to a variety of power supply environments from portable devices to industrial systems

Gain options: Configurable to 1, 2, 5, 10, 20, 50, or 100x gain via external pins for precise gain settings without complex external resistor networks

Input offset voltage: 150μV max (25°C) to ensure high precision signal amplification requirements

Input bias current: Typically only 10nA, dramatically reducing the impact on the signal source

Bandwidth: Variable bandwidth characteristics from 1MHz (G=1) to 50kHz (G=100).

Package: Compact 16-pin DFN (3mm x 3mm) package for space-constrained applications.

The LT1997IDF-3 offers a number of differentiating advantages over similar products. Its unique gain selection architecture is achieved through an internal precision resistor network, avoiding the accuracy drift and temperature coefficient matching problems associated with external resistors in traditional variable gain amplifiers. The integrated laser trimming resistor network ensures high accuracy and excellent temperature stability at all gain levels, with typical gain errors as low as 0.02% and temperature coefficients as low as 5 ppm/°C. This design not only simplifies the board layout, but also dramatically improves long-term system stability, making it particularly suitable for demanding industrial environments.

Application flexibility is another highlight of the LT1997IDF-3. The device supports single- and dual-supply modes of operation, with output voltage swings up to 1.3V on the supply rails, enabling it to directly drive standard ADC inputs. The input common-mode range extends to 100mV below the negative power rail and 1V above the positive power rail, providing great convenience for sensor interface design. In addition, the device's internal integrated EMI filter circuitry effectively suppresses high-frequency interference and maintains signal integrity in complex electromagnetic environments.

Typical Application Of LT1997IDF-3

Industrial automation and process control

In the field of industrial sensor signal conditioning, LT1997IDF-3 plays a key role. Various types of sensors in industrial environments (e.g., pressure transmitters, thermocouples, RTD temperature sensors, strain gages, etc.) often output weak millivolt signals and operate in harsh environments with temperature fluctuations, EMI, etc. The LT1997IDF-3's wide range of operating voltages (±2.5V to ±18V) allows it to be used directly with industry-standard ±15V or ±12V power supplies, while its high-accuracy and low-drift operation enables it to be used directly with industry standard ±15V or ±12V power supplies. Its high accuracy and low drift characteristics ensure accurate signal conditioning.

Test and Measurement Equipment

The LT1997IDF-3's ultra-low noise and low distortion characteristics make it an ideal choice for precision measurement equipment where the accuracy and stability of the signal chain is critical. The LT1997IDF-3 is often used as a preamplifier or programmable gain amplifier (PGA) in equipment such as digital multimeters, data acquisition systems, and spectrum analysers.

Medical Electronic Devices

Medical equipment requires high levels of safety and reliability in signal conditioning circuits, and the LT1997IDF-3's low power consumption and low noise characteristics make it ideal for portable medical equipment, while the wide supply voltage range meets the needs of bench-top medical equipment.

Automotive Electronic Systems

As the degree of automotive electronics increases, the LT1997IDF-3 is increasingly widely used in automotive sensing systems. Its wide voltage range accommodates fluctuations in automotive power supplies, while its strong EMI immunity addresses the electromagnetic challenges of the automotive environment.