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SNAS633A – MARCH 2014 – REVISED SEPTEMBER 2014 LMP93601 Low-Noise, High Gain, 3-Channel AFE for Thermopile Sensors
1 Features 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. High Gain, Programmable up to 4096
Low Gain Error Drift, 10 * RSx). 34 Submit Documentation Feedback Copyright В© 2014, Texas Instruments Incorporated Product Folder Links: LMP93601 LMP93601
www.ti.com SNAS633A – MARCH 2014 – REVISED SEPTEMBER 2014 Typical Applications (continued)
The bias current of the sensor and the leakage current of the sensor’s MUX should be considered as well. In
Figure 31 R1 and R2 need to be matched closely to avoid introduction of differential offset error voltage in the
signal path due to mismatched current flow through these resistors. Moreover, Ios through RSx needs to be
calibrated out over temperature. To simplify the circuit in Figure 31 the MUX inside the AFE is not shown. Figure 31. Submit Documentation Feedback Copyright В© 2014, Texas Instruments Incorporated Product Folder Links: LMP93601 35 LMP93601
SNAS633A – MARCH 2014 – REVISED SEPTEMBER 2014 www.ti.com 10 Power Supply Recommendations
The LMP93601 requires two sources of power, AVDD and IOVDD. These pins can be supplied from the
same supply rail as the MCU, from separate regulators or from a battery source. However, it is recommend …