LMP91200

TSSOP (PW)

16

22 mm² 5 x 4.4

Active Guarding
Key Specifications
Unless otherwise noted, typical values at
T_A = 25°C, V_S = (VDD-GND) = 3.3 V

pH Buffer Input Bias Current (0 < V_INP < 3.3 V)
- Maximum at 25°C: ±125 fA
- Maximum at 85°C: ±445 fA
pH Buffer Input Bias Current
(–500 mV < V_INP– V_CM < 500 mV),
V_S = (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

Active Guarding
Key Specifications
Unless otherwise noted, typical values at
T_A = 25°C, V_S = (VDD-GND) = 3.3 V

pH Buffer Input Bias Current (0 < V_INP < 3.3 V)
- Maximum at 25°C: ±125 fA
- Maximum at 85°C: ±445 fA
pH Buffer Input Bias Current
(–500 mV < V_INP– V_CM < 500 mV),
V_S = (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

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

Design & development

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

Evaluation board

LMP91200EVAL — LMP91200 AFE pH sensor evaluation module

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 (...)

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Driver or library

Associated Files for Application Note MSP430 Interface to LMP91200 Code Library

SNAC044.ZIP (68 KB)

Support software

LMP91200 Sensor AFE Software Download

SNAC005.ZIP (31311 KB)

Simulation model

LMP91200 PSpice Transient Model (Rev. A)

SNAM129A.ZIP (25 KB) - PSpice Model

Simulation model

LMP91200 TINA-TI Reference Design

SNAM130.TSC (395 KB) - TINA-TI Reference Design

Simulation model

LMP91200 TINA-TI Transient Spice Model (Rev. A)

SNAM131A.ZIP (54 KB) - TINA-TI Spice Model