LT1997HMS-2#PBF

Instrumentation, Op Amps, Buffer Amps Overview

The LT1997HMS-2#PBF is a precision, wide voltage range, gain selectable funnel amplifier manufactured by Analog Devices Inc. It integrates a precision operational amplifier with highly matched internal resistors to attenuate and level shift large differential signals into low voltage ranges compatible with analog-to-digital converters (ADCs). The device features three standard pin-selectable gain options of 0.1, 0.2, and 0.25, which can be combined for gains ranging from 0.0455 to 0.55. It operates across a supply voltage range of 3.3V to 50V and supports an input common-mode voltage range up to ±255V. The component is housed in a space-saving 16-lead MSOP package and is specified for operation from –40°C to 125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Integrates a precision operational amplifier with highly matched internal resistors to form a one-chip solution for accurate attenuation and level shifting without external components.
• Provides three standard pin-selectable gain options (0.1, 0.2, and 0.25) that can be combined to achieve gains from 0.0455 to 0.55 with high accuracy.
• Supports a very wide input common-mode voltage range of ±255V, enabling robust operation in demanding industrial environments.
• Features excellent resistor matching resulting in a common mode rejection ratio greater than 105dB and extremely linear resistors with gain nonlinearity less than 2ppm.

Instrumentation, Op Amps, Buffer Amps Applications

• High voltage to low voltage level translation
• ADC driver applications
• Bidirectional wide common mode range voltage and current sensing
• Industrial data-acquisition front-ends
• Differential to single-ended conversion

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific H-grade temperature rating (-40°C to 125°C) and the MSOP-16 package configuration against design requirements. Confirm RoHS compliance via the #PBF suffix. Ensure input common-mode voltages remain within the ±270V absolute maximum limit to prevent damage. Check datasheet for Over-The-Top operation performance degradation if biasing near or above the positive supply rail.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when precise attenuation of large differential signals is required without external resistor networks. The H-grade variant is suitable for harsh industrial environments requiring extended temperature operation. Consider the pin-selectable gain options for flexibility in circuit design. Evaluate the ±255V common-mode range capability against system signal levels. Verify power dissipation limits for the MSOP package under expected load conditions.

Instrumentation, Op Amps, Buffer Amps Part Context

The LT1997HMS-2#PBF belongs to the LT1997 family of funnel amplifiers designed for high-voltage signal conditioning. It replaces complex discrete resistor networks and isolation circuits with a compact integrated solution. The 'H' designation indicates the extended temperature grade, while 'MS' denotes the 16-lead MSOP package. This part is engineered for applications demanding high accuracy and wide dynamic range in noisy or high-voltage industrial settings.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

LT1997IMS-2#PBF: Same electrical specifications but rated for -40°C to 85°C operating temperature.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the LT1997-2 handle input common-mode voltages exceeding the positive supply rail?

The device can operate in an Over-The-Top (OTT) region where the internal op amp's common-mode voltage is biased near or above V+. In this state, it supports input voltages up to 76V above V-, though performance metrics like input bias current and offset voltage may degrade compared to normal operation.

What determines the available gain combinations for the LT1997-2?

The device offers three standard pin-selectable gains of 0.1, 0.2, and 0.25. These can be combined internally to create effective gains ranging from 0.0455 to 0.55, allowing for attenuation factors between 1.82 and 22.