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Linear Technology Electronic Components Datasheet


LM285S8-2.5

Micropower Voltage Reference


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LM285S8-2.5 pdf
FEATURES
s 20µA to 20mA Operating Range
s Guaranteed 1% Initial Voltage Tolerance
s Guaranteed 1Dynamic Impedance
s Very Low Power Consumption
APPLICATI S
s Portable Meter References
s Portable Test Instruments
s Battery-Operated Systems
s Panel Meters
s Current Loop Instrumentation
LM185-2.5/
LM285-2.5/LM385-2.5
Micropower Voltage
Reference
DESCRIPTIO
The LM185-2.5 is a two-terminal band gap reference
diode that has been designed for applications which
require precision performance with micropower opera-
tion. The device provides guaranteed operation specifica-
tions at currents as low as 20µA. The nominal voltage is
2.5V with both 1% and 2% tolerances available. Some
additional features are: maximum dynamic impedance of
1, low noise and excellent stability over time and tem-
perature. The advanced design, processing and testing
techniques make Linear’s LM185-2.5 a superior choice
over previous designs. A circuit for cold junction compen-
sation of a thermocouple is shown below.
For applications requiring guaranteed temperature drift,
see the LT1034 data sheet.
TYPICAL APPLICATI
Thermocouple Cold Junction Compensator
IQ 50µA
2 MERCURY
CELLS 2.6V
16k
1M
LM385-2.5
100k W.W.
ZERO
950
TYPE K
+
METER
VIN
LM334
RSET
V
2k
450
10k ADJUST
FOR 12.17mV
AT 25°C
ACROSS 450
LM185-2.5 TA01
Reverse Voltage Change
16
–55°C TA +125°C
12
8
4
0
–4
0.01
0.1 1
10
REVERSE CURRENT (mA)
100
LM185-2.5 TA02
1



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LM285S8-2.5 pdf
LM185-2.5/
LM285-2.5/LM385-2.5
ABSOLUTE AXI U RATI GS
Reverse Breakdown Current ................................ 30mA
Forward Current................................................... 10mA
Operating Temperature Range
LM185-2.5 ..................................... –55°C to 125°C
LM285-2.5 ...................................... – 40°C to 85°C
LM385-2.5 ........................................... 0°C to 70°C
Storage Temperature Range
LM185-2.5 .................................... – 65°C to 150°C
LM285-2.5 .................................... – 65°C to 150°C
LM385-2.5 .................................... – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC 1
NC 2
NC 3
8
7 NC
6
ORDER PART
NUMBER
LM285S8-2.5
LM385S8-2.5
LM385BS8-2.5
BOTTOM VIEW
12
4 5 NC PART MARKING
(DO NOT
S8 PACKAGE
USE)
8-LEAD PLASTIC SO
LM185-2.5 PO03
2852
3852
3852B
H PACKAGE
2-LEAD TO-46 METAL CAN
LM185-2.5 PO01
ORDER PART
NUMBER
LM185H-2.5
LM285H-2.5
LM385H-2.5
LM385BH-2.5
(NOTE 2)
BOTTOM VIEW
321
Z PACKAGE
3-LEAD TO-92 PLASTIC
LM185-2.5 PO02
ORDER PART
NUMBER
LM285Z-2.5
LM385Z-2.5
LM385BZ-2.5
(NOTE 2)
ELECTRICAL CHARACTERISTICS (See Note 1)
SYMBOL PARAMETER
VZ Reverse Breakdown Voltage
VZ
Temp
IMIN
VZ
IR
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage
Change With Current
rZ Reverse Dynamic Impedance
en
VZ
Time
Wide Band Noise (RMS)
Long Term Stability
CONDITIONS
TA = 25°C, 20µA IR 20mA
LM185-2.5/285-2.5
LM385-2.5
LM385B-2.5 (Note 2)
20µA IR 20mA (Note 2)
LM185-2.5/285-2.5
MIN TYP MAX
2.462 2.500 2.538
20
TMIN TA TMAX
20µA IR 1mA
TA = 25°C
TMIN TA TMAX
1mA IR 20mA
TA = 25°C
TMIN TA TMAX
IR = 100µA (Note 3)
TA = 25°C
TMIN TA TMAX
10Hz f 10kHz, IR = 100µA
TA = 25°C ± 0.1°C, IR = 100µA
q
q
q
q
8 20
1.0
1.5
10
20
0.2 0.6
1.5
120
20
LM385-2.5/385B-2.5
MIN TYP MAX
UNITS
2.425
2.462
2.500 2.575
2.500 2.538
20
V
V
V
ppm/°C
8 20
µA
2.0 mV
2.5 mV
20 mV
25 mV
0.4 1.0
1.5
120
20
µV
ppm/kHr
The q denotes specifications which apply over the operating temperature
range.
Note 1: All specifications are for TA = 25°C unless otherwise noted. For
the LM185-2.5 TMIN = – 55°C and TMAX = 125°C. For LM285-2.5, TMIN =
– 40°C and TMAX = 85°C. For LM385-2.5, TMIN = 0°C and TMAX = 70°C.
Note 2: For very low initial tolerance, consult LT1004 data sheet. The
LT1004 is a low cost, pin for pin substitution device. For guaranteed
temperature coefficient consult the LT1034-2.5 data sheet.
Note 3: Guaranteed but not tested.
2



Part Number LM285S8-2.5
Description Micropower Voltage Reference
Maker Linear Technology - Linear Technology
Total Page 4 Pages
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