+1.8V to +5.5V

GND

OUT

Input

Pin

LMT85

Reset

Sample

Simplified Input Circuit of

SAR Analog-to-Digital Converter

LMT85, LMT85-Q1

www.ti.com

SNIS168C – MARCH 2013 – REVISED OCTOBER 2015

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LMT85/LMT85-Q1 features make it suitable for many general temperature sensing applications. It can

operate down to 1.8V supply with 5.4 uA power consumption making it ideal for battery powered devices.

Package options including through-hole TO-92 package allows the LMT85 to be mounted on-board, off-board, to

a heat sink, or on multiple unique locations in the same application.

9.2 Typical Applications

9.2.1 Connection to an ADC

Figure 12. Suggested Connection to a Sampling Analog-to-digital Converter Input Stage

9.2.1.1 Design Requirements

Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When

the ADC charges the sampling cap, it requires instantaneous charge from the output of the analog source such

as the LMT85/LMT85-Q1 temperature sensor and many op amps. This requirement is easily accommodated by

9.2.1.2 Detailed Design Procedure

ADCs have identical input stages, the charge requirements will vary.

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