Datasheet

  
  
SLVS075I − APRIL 1989 − REVISED DECEMBER 2005
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics at specified free-air temperature
PARAMETER
TEST
T
A
†
LM285-1.2 LM385-1.2 LM385B-1.2
UNIT
PARAMETER
TEST
CONDITIONS
T
A
†
MIN TYP MAX MIN TYP MAX MIN TYP MAX
UNIT
V
Z
Reference
voltage
I
Z
= I(min)
to 20 mA
‡
25°C 1.223 1.235 1.247 1.21 1.235 1.26 1.223 1.235 1.247 V
α
VZ
Average
temperature
coefficient of
reference
voltage
§
I
Z
= I(min)
to 20 mA
‡
Full range ±20 ±20 ±20 ppm/°C
Change in
I
Z
= I(min)
25°C 1 1 1
∆V
Z
Change in
reference
I
Z
= I(min)
to 1 mA
‡
Full range 1.5 1.5 1.5
mV
∆V
Z
reference
voltage with
current
I
Z
= 1 mA
25°C 12 20 20
mV
voltage with
current
I
Z
= 1 mA
to 20 mA
Full range 30 30 30
∆V
Z
/∆t
Long-term
change in
reference
voltage
I
Z
= 100 µA 25°C ±20 ±20 ±20 ppm/khr
I
Z
(min)
Minimum
reference
current
Full range 8 10 8 15 8 15 µA
z
z
Reference
I
Z
= 100 µA,
25°C 0.2 0.6 0.4 1 0.4 1
Ω
z
z
Reference
impedance
I
Z
= 100 µA,
f = 25 Hz
Full range 1.5 1.5 1.5
Ω
V
n
Broadband
noise voltage
I
Z
= 100 µA,
f = 10 Hz to
10 kHz
25°C 60 60 60 µV
†
Full range is −40°C to 85°C for the LM285-1.2 and 0°C to 70°C for the LM385-1.2 and LM385B-1.2.
‡
I(min) = 10 µA for the LM285-1.2 and 15 µA for the LM385-1.2 and LM385B-1.2
§
The average temperature coefficient of reference voltage is defined as the total change in reference voltage divided by the specified temperature
range.