1 Features

• 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.

1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Simplified Thermopile Array System Diagram

Analog Supply Vs. Offset Voltage Plot