LMP91200

ACTIVE

Integrated AFE for Low-Power pH Sensing Applications

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Product details

Parameters

Features Current Sources (iDACs), PGA Operating temperature range (C) -40 to 125 Vs (Min) (V) 1.8 Vs (Max) (V) 6 Interface type Serial SPI Rating Catalog open-in-new Find other Signal conditioners

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 open-in-new Find other Signal conditioners

Features

  • 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
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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.

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Technical documentation

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Type Title Date
* Datasheet LMP91200 Configurable AFE for Low Power Chemical Sensing Apps datasheet (Rev. E) Feb. 29, 2016
Technical article What can we learn for IIoT from the man who invented the Web? Jan. 12, 2016
Technical article Get Connected: A new blog series Jan. 10, 2014
Application note AN-2254 MSP430 Interface to LMP91200 Code Library (Rev. A) May 01, 2013
More literature Sensor Analog Front Ends Brochure Oct. 30, 2012
More literature LMP91200 Sensor AFE Evaluation Board User's Guide (Rev. A) May 30, 2012
More literature LMP91200 Sensor AFE Evaluation Board User's Guide May 07, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
499
Description

The LMP91200 evalboard (LMP91200EVAL) can be used as stand-alone or as part of SensorAFE eval platform (refer to the SensorAFE platform page for software and required hardware). It allows configuring the LMP91200 through a 3-wire SPI interface and testing the device with real PH probe. Moreover the (...)

Features

Contents:

  • Assembled LMP91200EVAL Board
  • LMP91200 Userguide
EVALUATION BOARD Download
document-generic User guide
149
Description

The SPIO-4 Digital Controller board is used to read registers, write registers, and capture data from various TI's Sensor AFE and other signal path products. The device evaluation board (for example: LMP90100EB) should be equipped with the GPSI-16 or GPSI-32 header to connect to the SPIO-4 board (...)

Software development

DRIVER OR LIBRARY Download
SNAC044.ZIP (68 KB)
SUPPORT SOFTWARE Download
SNAC005.ZIP (31311 KB)

Design tools & simulation

SIMULATION MODEL Download
SNAM129A.ZIP (25 KB) - PSpice Model
SIMULATION MODEL Download
SNAM130.TSC (395 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNAM131A.ZIP (54 KB) - TINA-TI Spice Model

Reference designs

REFERENCE DESIGNS Download
Wireless pH Sensor Transmitter (DevPack for SensorTag) Reference Design
TIDA-00561 The TIDA-00561 shows how to build an industrial-grade wireless pH transmitter for process control.

This TI Design includes a designed pH front-end, which can be connected directly via its onboard connector to most pH probes used in process control. The performance data was tested and characterized (...)

document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options

Ordering & quality

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  • Ongoing reliability monitoring

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