National Semiconductor Introduces Micropower Precision Amplifiers with Lowest Guaranteed Voltage Offset Drift over Temperature

PowerWise LMP223x family consumes less than 16 uW per channel with TCVOS as low as +/- 0.4 uV per degrees Celsius.

National Semiconductor introduces a family of Micropower precision amplifiers that provides guaranteed maximum offset voltage drift over temperature (TCVOS) as low as +/- 0.4 microvolts per degree Celsius (uV/C).

These 16 uW per channel operational amplifiers (op amps) feature the industry’s lowest TCVOS, along with low offset voltage, quiescent current and bias current to enable a high level of system accuracy, extended battery life and long term stability in portable systems and battery-powered sensor interface products.

The LMP2231 single and LMP2232 dual feature CMOS inputs, 1.6V to 5.5V operation, 10 uA of supply current per channel, low offset voltage of 150 uV and a wide temperature range of -40 degrees C to 125 degrees C. The op amps have ultra-low power consumption of less than 16 uW per channel, while providing 130 kHz of usable bandwidth, which places them among National’s PowerWise® family of energy efficient products.

The new LMP® precision op amps are built on National’s proprietary VIP50 BiCMOS process technology. The VIP50 process allows National to design higher-performance precision op amps, along with the most power-efficient, low-voltage amplifiers on the market.

Key Features of LMP2231/32 Precision Op Amps

The LMP2231 single Micropower, precision amplifier provides 1.6V to 5.5V guaranteed operating supply voltage range and quiescent power consumption of only 16 uW. The device features a maximum offset of 150 uV, along with a maximum offset voltage drift of 0.4 uV/C and low bias current of +/- 20 femtoamperes (fA). Its rail-to-rail output swings 15 mV from the supply voltage to increase system dynamic range. The LMP2231’s common-mode input voltage range extends 200 mV below the negative supply, making the device well-suited for use in single-supply applications with ground sensing. The LMP2231 is offered in 5-pin SOT23 and 8-pin SOIC packages.

The LMP2232 dual Micropower, precision amplifier provides 1.6V to 5.5V guaranteed operating supply voltage range and quiescent power consumption of only 13 uW per channel. The device has a maximum offset voltage of 150 uV, along with a maximum offset voltage drift of 0.5 uV/C and low bias current of +/- 20 fA. The LMP2232 is offered in 8-pin SOIC or 8-pin MSOP packages.

About National’s PowerWise Brand

National’s PowerWise brand reflects the company’s energy-efficient product portfolio. It signifies products with outstanding performance-to-power at the component level, as well as products that provide an outstanding, energy-efficient solution when coupled with other National parts. National’s PowerWise family of products features energy-efficient power management, operational amplifiers, interface, and data conversion products. For more information about National’s PowerWise brand, visit: www.national.com/powerwise.

Features & benefits:

• 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

Product information table: