LM74

SNIS107K – MAY 2000 – REVISED MARCH 2013

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Temperature-to-Digital Converter Characteristics

Unless otherwise noted, these specifications apply for V

+ = 2.65V to 3.6V for the LM74CIBP -3, LM74CITP-3, V+ = 3.0V to

3.6V for the LM74CIM -3 and V

+ = 4.5V to 5.5V for the LM74 -5(1). Boldface limits apply for T

A = TJ = TMIN to TMAX; all other

limits TA = TJ=+25°C, unless otherwise noted.

Typical(2)

LM74-5

LM74-3

Units

Parameter

Conditions

Limits(3)

Limits(3)

(Limit)

Temperature Error(1)

TA = −10°C to +65°C

±1.25

±1.25

°C (max)

TA = −25°C to +110°C

±2.1

+2.65/

−2.15

°C (max)

TA = −40°C to +85°C

+2.65/

−1.65

±2.15

°C (max)

TA = −40°C to +110°C

+2.65/

+2.65/

−2.15

°C (max)

−2.0

TA = −55°C to +125°C

±3.0

±3.5

°C (max)

TA = −55°C to +150°C

±5.0

±5.0

°C (max)

Resolution

13

Bits

Temperature

SOIC See(4)

280

425

425

ms (max)

Conversion Time

DSBGA See(4)

611

925

925

ms (max)

Quiescent Current

SOIC Serial Bus Inactive

310

520

520

μA (max)

DSBGA

265

470

470

μA (max)

SOIC Serial Bus Active

310

μA

DSBGA

310

μA

SOIC Shutdown Mode,

7

μA

V+ = 3.3V

DSBGA

3

μA

SOIC Shutdown Mode,

8

μA

V+ = 5V

DSBGA

4

μA

(1)

All SOP (LM74CIM) parts will function over the V+ supply voltage range of 3V to 5.5V. All DSBGA (LM74SIBP and LM75CITP) parts will

function over the V+ supply voltage range of 2.65V to 5.5V. The SOP (LM74CIM) parts are tested and specified for rated temperature

error at their nominal supply voltage for temperature ranges of

−10°C to +65°C, −55°C to +125°C and −55°C to +150°C. For the SOP

(LM74CIM) parts, the temperature error specifications for temperature ranges of

−40°C to +85°C, −25°C to +110°C, and −40°C to

+110°C include error induced by power supply variation of ±5% from the nominal value. For the LM74CIM (SOP) parts, the temperature

error will increase by ±0.3°C for a power supply voltage (V+) variation of ±10% from the nominal value.For the LM74CIBP-3 and

LM74CITP-3 (DSBGA) parts all accuracies are ensured over the supply range of 2.65V to 3.6V, except for the temperature ranges of -

55°C to 125°C and

−55°C to +150°C where the accuracy applies for the nominal supply voltage of 3.3V. For the LM74CIBP-5 and

LM74CITP-5 (DSBGA) parts all accuracies are guranteed over the supply range of 4.75V to 5.25V, except for the temperature ranges of

-55°C to 125°C and

−55°C to +150°C where the accuracy applies for the nominal supply voltage of 5.0V. For the LM74CIBP and

LM74CITP over -55°C to 125°C and

−55°C to +150°C, a power supply variation of ±10% will degrade the accuracy by ±0.3°C.

(2)

Typicals are at TA = 25°C and represent most likely parametric norm.

(3)

Limits are specified to AOQL (Average Outgoing Quality Level).

(4)

This specification is provided only to indicate how often temperature data is updated. The LM74 can be read at any time without regard

to conversion state (and will yield last conversion result). A conversion in progress will not be interrupted. The output shift register will be

updated at the completion of the read and a new conversion restarted.

4

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