Zero Drift Operational Amplifiers

National features a rich portfolio of near zero input offset voltage drift op amps. National's zero-drift amplifiers use a breakthrough noise-shaping technology that employs continuous-correction circuitry to auto zero the input offset error voltage. This enables uninterrupted accuracy over time and temperature, with high common-mode rejection ratio (CMRR) and high power-supply rejection ratio (PSRR). These features are enabled through chopper amplifier technology that continuously corrects offset error while maintaining a high bandwidth and integrating the capacitors.

These products in the LMP precision amplifier family feature:

• Near zero input offset voltage drift
• Ultra low input offset voltage
• Very low input voltage noise with no 1/f noise component
• Very high open loop gain

Zero drift op amps are ideal for applications including:

• Precision instrumentation amplifiers
• Battery powered instrumentation
• Thermocouple / thermopile sensors
• Bridge sensor interface
• Industrial precision weigh scales
• Precision data acquisition systems
• Medical equipment
• Scientific Instrumentation

Featured Products: LMP2021/22

• 11nV/√Hz input voltage noise density at a gain of 1000V/V
• 0.004uV/ºC input offset voltage drift
• 0.4uV input offset voltage
• 5 MHz gain bandwidth
• 160dB open loop gain
• 25pA input bias current
• 139dB CMRR
• 130dB PSRR
• 79dB EMI rejection ratio (EMIRR)