LMP91050 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications
1 Features
- Programmable Gain Amplifier
- Dark Signal Offset Cancellation
- Supports External Filtering
- Common-Mode Generator and 8-Bit DAC
- Key Specifications
- Programmable Gain 167 to 7986 V/V
- Low Noise (0.1 to 10 Hz) 0.1 μVRMS
- Gain Drift 100 ppm/°C (Maximum)
- Phase Delay Drift 500 ns (Maximum)
- Power Supply Voltage Range 2.7 to 5.5 V
2 Applications
- NDIR Sensing
- Demand Control Ventilation
- Building Monitoring
- CO2 Cabin Control — Automotive
- Alcohol Detection — Automotive
- Industrial Safety and Security
- GHG and Freons Detection Platforms
3 Description
The LMP91050 device is a programmable integrated Sensor Analog Front End (AFE) optimized for thermopile sensors, as typically used in NDIR applications. It provides a complete signal path solution between a sensor and microcontroller that generates an output voltage proportional to the thermopile voltage. The programmability of the LMP91050 enables it to support multiple thermopile sensors with a single design as opposed to the multiple discrete solutions.
The LMP91050 features a programmable gain amplifier (PGA), dark phase offset cancellation, and an adjustable common-mode generator (1.15 V or 2.59 V) which increases output dynamic range. The PGA offers a low-gain range of 167 V/V to 1335 V/V plus a high-gain range of 1002 V/V to 7986 V/V which enables the user to use thermopiles with different sensitivities. The PGA is highlighted by low-gain drift (100 ppm/°C), output offset drift (1.2 mV/°C at G = 1002 V/V), phase delay drift (500 ns) and noise specifications (0.1 μVRMS 0.1 to 10Hz).
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LMP91050 | VSSOP (10) | 3.00 mm × 3.00 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Typical Application Circuit
| Configurable AFE for NDIR |
4 Revision History
Changes from D Revision (March 2013) to E Revision
- Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
Changes from C Revision (April 2012) to D Revision
- Changed layout of National Data Sheet to TI formatGo
5 Description (continued)
The offset cancellation circuitry compensates for the dark signal by adding an equal and opposite offset to the input of the second stage, thus removing the original offset from the output signal. This offset cancellation circuitry allows optimized usage of the ADC full scale and relaxes ADC resolution requirements.
The LMP91050 allows extra signal filtering (high-pass, lowpass or bandpass) 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.
