Rainbow-electronics LM93 Manual do Utilizador descarregar pdf (Página 90)

Symbol Pin # D1 D2 D4 D5 D6 SNP R1

AD_IN1 23 UUUUU

AD_IN2 24 UUUUU

AD_IN3 25 UUUUU

AD_IN4 26 UUUUU

AD_IN5 27 UUUUU

AD_IN6 28 UUUUU

AD_IN7 29 UUUUU

AD_IN8 30 UUUUU

AD_IN9 31 UUUUU

AD_IN10 32 UUUUU

AD_IN11 33 UUUUU

AD_IN12 34 UUUUU

AD_IN13 35 UUUUU

AD_IN14 36 UUUUU

AD_IN15 37 UUUUU

ADDR_SEL 38 UU

AD_IN16/V

(V+)

39 UUU U

GND 40 Internally shorted to AGND.

PWM1 41 UUU50 Ω

PWM2 42 UUU50 Ω

P1_VID0 43 UU

P1_VID1 44 UU

P1_VID2 45 UU

P1_VID3 46 UU

P1_VID4 47 UU

P1_VID5 48 UU

P1_PROCHOT

49 UUU50 Ω

P2_PROCHOT

50 UUU50 Ω

P2_VID0 51 UU

P2_VID1 52 UU

P2_VID2 53 UU

P2_VID3 54 UU

P2_VID4 55 UU

P2_VID5 56 UU

Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Machine model, 200 pF discharged directly into each pin.

Note 5: Reflow temperature profiles are different for lead-free and non lead-free packages.

Note 6: The maximum power dissipation must be de-rated at elevated temperatures and is dictated by T

JMAX

, θ

and the ambient temperature, T

. The maximum

allowable power dissipation at any temperature is PD = (T

JMAX

−T

)/θ

. The θ

for the LM93 when mounted to 1 oz. copper foil PCB the θ

with different air

flow is listed in the following table.

Air Flow Junction to Ambient Thermal Resistance, θ

0 m/s 79 ˚C/W

1.14 m/s (225 LFPM) 62 ˚C/W

2.54 m/s (500 LFPM) 52 ˚C/W

Note 7: See the URL "http://www.national.com/packaging/" for other recommendations and methods of soldering surface mount devices.

Note 8: When measuring an MMBT3904 transistor, 4 ˚C should be subracted from all temperature readings.

Note 9: Typical parameters are at T

= 25 ˚C and represent most likely parametric norm.

Note 10: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 11: TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC.

Note 12: Total Monitoring Cycle Time includes all temperature and voltage conversions.

Note 13: Leakage current approximately doubles every 20 ˚C.

Note 14: A total digital I/O current of 40mA can cause 6mV of offset in Vref.

LM93

www.national.com 90

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