LMT87

SHUTDOWN

Any logic

device output

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

±50

0

50

100

150

TEMPERATURE (

ƒC)

C001

LMT87, LMT87-Q1

www.ti.com

SNIS170C – JAN 2014 – REVISED OCTOBER 2015

Typical Applications (continued)

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 LMT87 and LMT87-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. Simple Shutdown Connection of the LMT87

9.2.2.1 Design Requirements

Since the power consumption of the LMT87 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

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

power savings is critical.

9.2.2.2 Detailed Design Procedure

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Product Folder Links: LMT87 LMT87-Q1