Integrated AFE for Low-Power pH Sensing Applications
Product details
Parameters
Package | Pins | Size
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
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.
Technical documentation
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
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
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
Design tools & simulation
Reference designs
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 (...)
Design files
-
download TIDA-00561 BOM.pdf (84KB) -
download TIDA-00561 Assembly Drawing.pdf (116KB) -
download TIDA-00561 PCB.pdf (630KB) -
download TIDA-00561 CAD Files.zip (504KB) -
download TIDA-00561 Gerber.zip (208KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
TSSOP (PW) | 16 | View options |
Ordering & quality
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Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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