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The LT1997IDF-3 combines a precision operational amplifier with highly matched resistors to form a single-chip solution for accurate voltage amplification. The LT1997-3 is particularly well suited for use as a differential amplifier, with excellent resistor matching resulting in a common-mode rejection ratio of greater than 91 dB. The amplifier has a maximum input offset voltage of 60 μV and a -3 dB bandwidth of 1.1 MHz (gain = 1).

The LT1997IDF-3 can operate from any supply voltage from 3.3V to 50V with a supply current of only 350μA. Output fluctuations are typically within 100mV of either supply rail.

The resistors maintain excellent matching performance over temperature; the temperature coefficient of match is guaranteed to be less than 1ppm/°C. Resistor-to-voltage linearity is extremely high, with gain nonlinearity of less than 2ppm.

LT1997IDF-3 Features

Pin configurable as a differential, inverting, or in-phase amplifier

91dB minimum DC CMRR (gain = 1)

65dB AC CMRR (at 100kHz, gain = 1)

0.006% (60ppm) Maximum Gain Error (Gain = 1)

1ppm/°C Maximum Gain Error Drift

2ppm Maximum gain non-linearity

±160V common mode voltage range

Wide supply voltage range: 3.3V to 50V

Rail-to-rail output

350µA supply current

60µV Maximum op amp offset voltage

1.1MHz -3dB bandwidth (gain = 1)

Low-power shutdown mode: 20µA

Applications

HV or LV side current sensing

Bi-directional wide common-mode range current detection

High-voltage to low-voltage level conversion

Industrial data acquisition front-ends

Replacement isolation circuits

Differential to single-ended conversion

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