Datasheet
ELECTRICAL CHARACTERISTICS
Maximum V
Z
Minimum V
Z
V at I = 1 mA
Z(dev) Z
DT
A
DT
A
× 10
6
V
Z(dev)
V at 25°C
Z
=
| V |a
Z
ppm
°C
70°C
× 10
6
4 mV
2500 mV
| V | =a
Z
ppm
°C
» 23
LT1009
SLVS013N – MAY 1987 – REVISED MAY 2009 .................................................................................................................................................................
www.ti.com
at specified free-air temperature
LT1009C LT1009I
PARAMETER TEST CONDITIONS T
A
(1)
UNIT
MIN TYP MAX MIN TYP MAX
D/PW package 2.49 2.5 2.51 2.49 2.5 2.51
25 ° C
LP package 2.495 2.5 2.505 2.495 2.5 2.505
V
Z
Reference voltage I
Z
= 1 mA V
D/PW package 2.485 2.515 2.475 2.525
Full range
LP package 2.491 2.509 2.48 2.52
V
F
Forward voltage I
F
= 2 mA 25 ° C 0.4 1 0.4 1 V
I
Z
= 1 mA,
125 125
V
ADJ
= GND to V
Z
Adjustment range 25 ° C mV
I
Z
= 1 mA,
45 45
V
ADJ
= 0.6 V to V
Z
– 0.6 V
Change in reference D/PW package 5 15
Δ V
Z(temp)
voltage with Full range mV
LP package 4 15
temperature
Average temperature 0 ° C to 70 ° C 15 25 15 25
ppm/
α V
Z
coefficient of I
Z
= 1 mA, V
ADJ
= open
° C
– 40 ° C to 85 ° C 20 35
reference voltage
(2)
25 ° C 2.6 10 2.6 6
Change in reference
Δ V
Z
I
Z
= 400 µ A to 10 mA mV
voltage with current
Full range 12 10
Long-term change in ppm/
Δ V
Z
/ Δ t I
Z
= 1 mA 25 ° C 20 20
reference voltage khr
25 ° C 0.3 1 0.3 1
Z
Z
Reference impedance I
Z
= 1 mA Ω
Full range 1.4 1.4
(1) Full range is 0 ° C to 70 ° C for the LT1009C and – 40 ° C to 85 ° C for the LT1009I.
(2) The deviation parameter V
Z(dev)
is defined as the difference between the maximum and minimum values obtained over the
recommended operating temperature range, measured at I
Z
= 1 mA. The average full-range temperature coefficient of the reference
voltage ( α V
Z
) is defined as:
α V
Z
can be positive or negative, depending upon whether the minimum V
Z
or maximum V
Z
, respectively, occurs at the lower
temperature.
For example, at I
Z
= 1 mA, maximum V
Z
= 2501 mV at 30 ° C, minimum V
Z
= 2497 mV at 0 ° C, V
Z
= 2500 mV at 25 ° C, Δ T
A
= 70 ° C for
LT1009C:
Because minimum V
Z
occurs at the lower temperature, the coefficient in this example is positive.
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