LMP93601 Datasheet, PDF (1/44 Pages) Texas Instruments – Low-Noise, High Gain, 3-Channel AFE for Thermopile Sensors

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LMP93601
SNAS633A – MARCH 2014 – REVISED SEPTEMBER 2014
LMP93601 Low-Noise, High Gain, 3-Channel AFE for Thermopile Sensors
1 Features
•1 High Gain, Programmable up to 4096
• Low Gain Error Drift, <10 ppm/°C
• Low Offset Voltage and Drift; 1 uV, 50 nV/°C
• Low Input Bias Current, 1.3 nA
• Low Input Offset Current, 120 pA
• VCM Output Signal for Level Shifting, AVDD/3
• Three Differential EMI Hardened Inputs
• 16-bit Δ∑ Analog-to-Digital Converter
• Low Noise Performance, ENOB 15.3 bits
• Four Output Data Rates, up to 1.3 kSPS
• Internal Voltage Reference for ADC
• SPI Interface Transfer Rate, 20 MHz
• Brown-Out Detect
• PGA Over-Range Detect
• Separate Analog and Digital Supplies, 2.7 to 5.5 V
• Low Current Consumption, 1.1 mA
• Low Power Shutdown Mode, < 0.1µA
• Operating Temp. –25 to 85 °C
2 Applications
• Thermopile Array Measurement
• Thermopile Flow Measurements
• Bridge Sensor Interface
• Gesture Recognition
3 Description
The LMP93601 is an optimized Analog-Front-End
(AFE) for occupancy detecting thermopile arrays up
to 16 x 16 and thermopile mass flow sensors. The
AFE combines excellent noise performance, low
offset voltage, high gain, and low-power consumption
at sampling rates ideal for monitoring thermopile
sensors.
The LMP93601 is a precision, 16-bit, analog-to-digital
converter (ADC) offered in a leadless WQFN-24
package. The device features three differential EMI
hardened inputs, a low-noise, high-gain
programmable gain amplifier (PGA), a level shifting
voltage source, an internal reference, and a
programmable sampling rate. The many integrated
features and the simple control of the LMP93601
through an SPI-compatible interface ease precision
measurements of thermopile sensor signals.
PART NUMBER
LMP93601
Device Information
PACKAGE
BODY SIZE
WQFN (24)
5.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Thermopile Array System
Diagram

IR sensor
X by Y Array
X-Decoder
Vref
Analog Data
AFE
LMP93601
SPI
Digital
Data
MCU
Analog Supply Vs. Offset Voltage Plot
10
8
6
4
2
0
±2
±4
±6
±25ƒC
±8
25°C
85°C
±10
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
AVDD (V)
C001
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.