Rainbow-electronics LM40 Manual do Utilizador descarregar pdf (Página 7)

Name

Circuit

All Input Structure Circuits

1NC A

Circuit A

Circuit C

Circuit B

Circuit D

2 GND B

V+/

3.3V SB

4 SWD A

5 ADD A

6 +1.2V C

7 +2.5V C

8 D1- D

9 D1+ E

10 D2- D

11 D2+ E

Circuit E

12 +5V C

13 +12V C

14 NC A

Note 4: Thermal resistance junction-to-ambient in still air when attached to a printed circuit board with 1 oz. foil is 148 ˚C/W.

Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.

Note 6: Reflow temperature profiles are different for lead-free and non lead-free packages.

Note 7: “Typicals” are at T

= 25˚C and represent most likely parametric norm. They are to be used as general reference values not for critical design calculations.

Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 9: The supply current will not increase substantially with a SensorPath transaction.

Note 10: Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the internal power

dissipation of the LM40 and the thermal resistance. See (Note 4) for the thermal resistance to be used in the self-heating calculation.

Note 11: TUE , total unadjusted error, includes ADC gain, offset, linearity and reference errors. TUE is defined as the "actual Vin" to achieve a given code transition

minus the "theoretical Vin" for the same code. Therefore, a positive error indicates that the input voltage is greater than the theoretical input voltage for a given code.

If the theoretical input voltage was applied to an LM40 that has positive error, the LM40’s reading would be less than the theoretical.

Note 12: The accuracy of the LM40CIMT is guaranteed when using the thermal diode of an Intel 90 nm Pentium 4 processor or any thermal diode with a non-ideality

factor of 1.011 and series resistance of 3.33Ω. When using a MMBT3904 type transistor as a thermal diode the error band will be typically shifted by -4.5 ˚C.

Note 13: This specification is provided only to indicate how often temperature and voltage data are updated.

Note 14: The output fall time is measured from (V

IH min

)to(V

IL max

Note 15: The output rise time is measured from (V

IL max

)to(V

IH min

Note 16: The rise and fall times are not tested but guaranteed by design.

LM40

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