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LMP91050
IN
10 nF
Thermopile
10 µF
160 k
160 k
6.8 nF
OUT
û ADC
10 µF 10 nF
CSB
SDIO
1 kO
1 µF
SCLK
10 nF
A0 A1
GND
VDD
VDD
CMOUT
CMOUT
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LMP91050
SNAS517E –NOVEMBER 2011–REVISED SEPTEMBER 2015
LMP91050 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications
1 Features 3 Description
The LMP91050 device is a programmable integrated
1
• Programmable Gain Amplifier
Sensor Analog Front End (AFE) optimized for
• Dark Signal Offset Cancellation
thermopile sensors, as typically used in NDIR
• Supports External Filtering
applications. It provides a complete signal path
solution between a sensor and microcontroller that
• Common-Mode Generator and 8-Bit DAC
generates an output voltage proportional to the
• Key Specifications
thermopile voltage. The programmability of the
– Programmable Gain 167 to 7986 V/V
LMP91050 enables it to support multiple thermopile
sensors with a single design as opposed to the
– Low Noise (0.1 to 10 Hz) 0.1 μVRMS
multiple discrete solutions.
– Gain Drift 100 ppm/°C (Maximum)
The LMP91050 features a programmable gain
– Phase Delay Drift 500 ns (Maximum)
amplifier (PGA), dark phase offset cancellation, and
– Power Supply Voltage Range 2.7 to 5.5 V
an adjustable common-mode generator (1.15 V or
2.59 V) which increases output dynamic range. The
2 Applications
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
• NDIR Sensing
enables the user to use thermopiles with different
• Demand Control Ventilation
sensitivities. The PGA is highlighted by low-gain drift
• Building Monitoring
(100 ppm/°C), output offset drift (1.2 mV/° C at G =
• CO2 Cabin Control — Automotive
1002 V/V), phase delay drift (500 ns) and noise
specifications (0.1 μV
RMS
0.1 to 10Hz).
• Alcohol Detection — Automotive
• Industrial Safety and Security
Device Information
(1)
• GHG and Freons Detection Platforms
PART NUMBER PACKAGE BODY SIZE (NOM)
LMP91050 VSSOP (10) 3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
Configurable AFE for NDIR
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 3
- ・ Abmessungen des Paketumrisses on Seite 23 Seite 25 Seite 26
- ・ Markierungsinformationen on Seite 23
- ・ Blockdiagramm on Seite 12
- ・ Typisches Anwendungsschaltbild on Seite 1 Seite 18 Seite 19 Seite 20
- ・ Technische Daten on Seite 1 Seite 3 Seite 4 Seite 6
- ・ Anwendungsbereich on Seite 1 Seite 28
- ・ Elektrische Spezifikation on Seite 4 Seite 5 Seite 6
