LMT86

SHUTDOWN

Any logic

device output

0.0

0.5

1.0

1.5

2.0

2.5

3.0

±50

0

50

100

150

TEMPERATURE (

ƒC)

C001

+2.2V to +5.5V

GND

OUT

Input

Pin

LMT86

Reset

Sample

Simplified Input Circuit of

SAR Analog-to-Digital Converter

LMT86, LMT86-Q1

SNIS169C – MARCH 2013 – REVISED OCTOBER 2015

www.ti.com

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 LMT86 and LMT86-Q1 temperature sensor and many op amps. This requirement is easily accommodated

9.2.1.2 Detailed Design Procedure

ADCs have identical input stages, the charge requirements will vary. This general ADC application is shown as

an example only.

9.2.1.3 Application Curves

Figure 13. Analog Output Transfer Function

9.2.2 Conserving Power Dissipation with Shutdown

Figure 14. Conserving Power Dissipation with Shutdown

9.2.2.1 Design Requirements

Since the power consumption of the LMT86 is less than 9 µA it can simply be powered directly from any logic

gate output, thus not requiring a specific shutdown pin. The device can even be powered directly from a micro

controller GPIO. In this way it can easily be turned off for cases such as battery powered systems where power

savings is critical.

14

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