Elektor Team

Zero Drift, Self Calibrating Instrumentation Amp

December 10, 2013 | 14:37
Zero Drift, Self Calibrating Instrumentation Amp
Zero Drift, Self Calibrating Instrumentation Amp

The LTC2057 Instrumentation amplifier from Linear Technology features zero-drift, self-calibrating circuitry and provides high DC precision over a wide supply range of 4.75 V to 36 V (4.75 V to 60 V for the high voltage LTC2057HV version). Offset voltage and 1/f noise are suppressed, giving this amp an offset voltage of 4 μV and a DC to 10 Hz input noise voltage of 200 nVP-P (typ).

 

The LTC2057’s self-calibrating circuitry results in low offset voltage drift with temperature, 0.015 μV/°C (max), and zero-drift over time. The amplifier also features an excellent power supply rejection ratio (PSRR) of 160 dB and a common mode rejection ratio (CMRR) of 150 dB (typ).

 

The LTC2057 provides rail-to-rail output swing and an input common mode range that includes the V– rail (V– – 0.1 V to V+ – 1.5 V). In addition to low offset and noise, the amplifier features a 1.5 MHz (typ) gain-bandwidth product (GBP) and a slew rate of 0.45 V/μs (typ).

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