LMP91200 - Texas Instruments

LMP91200 Configurable AFE

The LMP91200 device is a sensor AFE for use in low-power, analytical-sensing applications. The LMP91200 is designed for 2-electrode sensors. This device provides all of the functionality needed to detect changes based on a delta voltage at the sensor. Optimized for low-power applications, the LMP91200 works over a voltage range of 1.8 V to 5.5 V. With its ex.

Features

•1 Active Guarding
• Key Specifications Unless otherwise noted, typical values at TA = 25°C, VS = (VDD-GND) = 3.3 V
  – pH Buffer Input Bias Current (0 < VINP < 3.3 V)
  – Maximum at 25°C: ±125 fA
  – Maximum at 85°C: ±445 fA
  – pH Buffer Input Bias Current (
  –500 mV < VINP
  – VCM < 500 mV), VS = (VDD
  – GND) = 0 V
  – Maximum at 25°C: ±600 fA
  – Maximum at 85°C: ±6.5 pA
  – pH Buffer Input Offset Voltage: ±200 µV
  – pH Buffer Input Offset Voltage Drift: ±2.5 μV/°C
  – Supply Current: 50 μA
  – Supply Voltage: 1.8 V to 5.5 V
  – Operating Temperature Range:
  –40°C to 125°C
  – Package: 16-Pin TSSOP 2 Applications
• pH.