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LMP91200MTX データシート(PDF) 1 Page - Texas Instruments |
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LMP91200MTX データシート(HTML) 1 Page - Texas Instruments |
1 / 24 page LMP91200 + ± pH BUFFER VCM BUFFER VDD VDD GND GND MCU VOUT ADC VOCM VREF GND VCMHI NC NC GUARD1 GUARD2 INP VCM GND pH Electrode Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LMP91200 SNAS571E – JANUARY 2012 – REVISED FEBRUARY 2016 LMP91200 Configurable AFE for Low-Power Chemical-Sensing Applications 1 1 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 Sensor Platforms 3 Description 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 extremely low input bias current it is optimized for use with pH sensors. Also, in absence of supply voltage the very low input bias current reduces degradation of the pH probe when connected to the LMP91200. Two guard pins provide support for high parasitic impedance wiring. Depending on the configuration, total current consumption for the device is 50 µA while measuring pH. Available in a 16-pin TSSOP package, the LMP91200 operates from –40°C to +125°C. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LMP91200 TSSOP (16) 5.00 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application |
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同様の説明 - LMP91200MTX |
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