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LMP91050MM Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza LMP91050MM
Descripción Electrónicos  LMP91050 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications
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LMP91050MM Datasheet(HTML) 1 Page - Texas Instruments

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LMP91050
www.ti.com
SNAS517D – NOVEMBER 2011 – REVISED MARCH 2013
LMP91050 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications
Check for Samples: LMP91050
1
FEATURES
DESCRIPTION
The LMP91050 is a programmable integrated Sensor
2
Programmable Gain Amplifier
Analog Front End (AFE) optimized for thermopile
“Dark Signal” Offset Cancellation
sensors, as typically used in NDIR applications. It
Supports External Filtering
provides a complete signal path solution between a
sensor and microcontroller that generates an output
Common Mode Generator and 8 bit DAC
voltage proportional to the thermopile voltage. The
LMP91050's programmability enables it to support
APPLICATIONS
multiple thermopile sensors with a single design as
NDIR Sensing
opposed to the multiple discrete solutions.
Demand Control Ventilation
The
LMP91050
features
a
programmable
gain
Building Monitoring
amplifier (PGA), “dark phase” offset cancellation, and
an adjustable common mode generator (1.15V or
CO2 Cabin Control — Automotive
2.59V) which increases output dynamic range. The
Alcohol Detection — Automotive
PGA offers a low gain range of 167V/V to 1335V/V
Industrial Safety and Security
plus a high gain range of 1002V/V to 7986V/V which
enables the user to utilize thermopiles with different
GHG & Freons Detection Platforms
sensitivities. The PGA is highlighted by low gain drift
(100 ppm/°C), output offset drift (1.2mV/°C at G =
KEY SPECIFICATIONS
1002 V/V), phase delay drift (500ns) and noise
Programmable gain 167 to 7986 V/V
specifications (0.1
μVRMS 0.1 to 10Hz) . The offset
cancellation circuitry compensates for the “dark
Low noise (0.1 to 10 Hz) 0.1
μVRMS
signal” by adding an equal and opposite offset to the
Gain Drift 100 ppm/°C (max)
input of the second stage, thus removing the original
Phase Delay Drift 500 ns (max)
offset from the output signal. This offset cancellation
circuitry allows optimized usage of the ADC full scale
Power supply voltage range 2.7 to 5.5 V
and relaxes ADC resolution requirements.
The LMP91050 allows extra signal filtering (high
pass, low pass or band pass) through dedicated pins
A0 and A1, in order to remove out of band noise. The
user can program through the on board SPI interface.
Available in a small form factor 10–pin package, the
LMP91050 operates from -40 to +105°C.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2011–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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