2.3 V to 5.5 V

GND

OUT

Input

Pin

TI Device

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Sample

Simplified Input Circuit of

SAR Analog-to-Digital Converter

8

TMP235, TMP236

SBOS857 – SEPTEMBER 2017

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8 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.

8.1 Application Information

The features of the TMP23x series make the series well-suited for various general temperature-sensing

applications. The TMP235 and TMP236 devices can operate down to a 2.3-V supply or a 3.1-V supply with 9-µA

power consumption, respectively. As a result, the series is well-suited for battery-powered applications. The

TMP23x series is mounted in two surface mount technology packages (SC70 and SOT-23.)

8.2 Typical Applications

8.2.1 Connection to an ADC

Figure 1. Suggested Connection to a Sampling Analog-to-Digital Converter Input Stage

8.2.1.1 Design Requirements

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

ADC charges the sampling capacitor, the capacitor requires instantaneous charge from the output of the analog

source (such as the TMP23x temperature sensor). The output impedance of the sensor can affect ADC

a 0.1-µF external capacitor for typical applications. This external capacitor reduces the sensor source impedance

and limits noise coupling. TI recommends placing the capacitor as close as possible to the ADC input for optimal

performance.

8.2.1.2 Detailed Design Procedure

requirements may vary because not all ADCs have identical input stages. Figure 1 shows a general ADC

application as an example only.