National Semiconductor’s New Precision OP Amplifiers

Single/Dual/Quad Micropower, 1.6V, Precision Operational Amplifier with CMOS Inputs.

The LMP223x is single/Dual/Quad micropower precision amplifier designed for battery powered applications. The 1.6V to 5.5V operating supply voltage range and quiescent power consumption of only 16 μW extend the battery life in portable battery operated systems.

The LMP223x is part of the LMP® precision amplifier family. The high impedance CMOS input makes it ideal for instrumentation and other sensor interface applications.

The LMP223x has a maximum offset of 150 μV and maximum offset voltage drift of only 0.4 μV/°C along with low bias current of only ±20fA. These precise specifications make the LMP2231 a great choice for maintaining system accuracy and long term stability.

The LMP223x has a rail-to-rail output that swings 15 mV from the supply voltage, which increases system dynamic range. The common mode input voltage range extends 200 mV below the negative supply, thus the LMP2231 is ideal for use in single supply applications with ground sensing.

Features & benefits:

(For VS = 5V, Typical unless otherwise noted)

• Supply current 10 μA
• Operating voltage range 1.6V to 5.5V
• Low TCVOS ±0.4 μV/°C (max)
• VOS ±150 μV (max)
• Input bias current 20 fA
• PSRR 120 dB
• CMRR 97 dB
• Open loop gain 120 dB
• Gain bandwidth product 130 kHz
• Slew rate 58 V/ms
• Input voltage noise, f = 1 kHz 60 nV/√Hz
• Temperature range –40°C to 125°C

Application information:

• Precision instrumentation amplifiers
• Battery powered medical instrumentation
• High impedance sensors
• Strain gauge bridge amplifier
• Thermocouple amplifiers

Product information table: