TMP61 datasheet(17/29 Pages) TI1

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Temperature (qC)

-60

-40

-20

100 120 140 160

0.8

1.6

2.4

3.2

4.8

5.6

d011

VTemp (IBIAS= 200 PA)

VTemp (VBIAS = 2 V)

Error (qC) (IBIAS = 200 PA)

Error (qC) (VBIAS = 2 V)

Temperature (qC)

100

125

150

D014

TMP61

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Typical Application (continued)

Figure 20. Thermal Foldback Voltage Output Curve

9.2.1.3 Application Curve

The TMP61 accuracy varies depending on the selected biasing circuit. This variation can be seen in Figure 21.

VTEMP is shown with either VBIAS at 2 V in a resistor divider circuit (RBIAS = 10 kΩ ±1%) or IBIAS at 200 µA. Supply

sources used are assumed to be ideal. The best accuracy is achieved using a direct current bias method.

Figure 21. TMP61 Voltage Output and Temperature Error Based on the Bias Method

10 Power Supply Recommendations

The maximum recommended operating voltage of the TMP61 is 5.5 V (VSns), and the maximum current through

the device is 400 µA (ISns).

11 Layout

11.1 Layout Guidelines

The layout of the TMP61 is similar to that of a passive component. If the device is biased with a current source,

the positive pin 2 will be connected to the source, while the negative pin 1 will be connected to ground. If the

circuit is biased with a voltage source, and the device is placed on the lower side of the resistor divider, V– will

be connected to ground and V+ will be connected to the output, VTEMP. If the device is placed on the upper side

of the divider, V+ is connected to the voltage source and V– is connected to the output voltage, VTEMP. Device

layout is as shown in Figure 22.

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