3

2

1

0

-1

-2

-3

Capacitance (nF)

0

0.5

1

1.5

2

2.5

3

TMP401

SBOS371B – AUGUST 2006 – REVISED OCTOBER 2014

www.ti.com

Typical Application (continued)

8.2.3.2 Differential Input Capacitance

The TMP401 tolerates differential input capacitance of up to 1000 pF with minimal change in temperature error.

The effect of capacitance on sensed remote temperature error is illustrated in Figure 27.

Figure 27. Remote Temperature Error vs Differential Capacitance

9 Power-Supply Recommendations

The TMP401 device operates with power supply in the range of 3.0 V to 5.5 V. The device is optimized for

operation at a 5-V supply but can measure temperature accurately in the full supply range. Refer to the TELOCAL

and TEREMOTE versus supply parameter in the Electrical Characteristics table for more information about the

power supply affect on the accuracy of the device.

A power-supply bypass capacitor is required for proper operation. Place this capacitor as close as possible to the

supply and ground pins of the device. A typical value for this supply bypass capacitor is 0.1

μF. Applications with

noisy or high-impedance power supplies may require additional decoupling capacitors to reject power-supply

noise.

30

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