Maxim Integrated Products MAX44251 dual sensor op amp: Precision dual sensor op amp features high voltage, low noise
EDN Staff - November 16, 2011
The MAX44251 dual device operates from a 2.7 to 27 V supply, and includes initial offset below 6 μV (maximum) along with a proprietary autocorrelating, autozero calibration approach which keeps drift below 19 nV/°C (maximum) over the -40 to +125°C range. Gain bandwidth is 10 MHz, while power dissipation is 1.15 mA per channel. Input-referred noise is 5.9 nV/√H̅z̅, which the vendor claims is the lowest available for a high-voltage, autozeroing component. Other critical specifications include PSRR (power supply-rejection ratio), CMRR (common-mode rejection ratio), and AVOL (large-signal voltage gain) at 135 dB each, (+25°C). In addition, the IC offers additional RF immunity, critical where so many industrial and medical installations are in RF-heavy environments. The MAX44251 is available in 8-lead SOT23 and μMAX packages, and is priced at $1.48 (1000); it is available now.
Maxim Integrated Products, www.maxim-ic.com