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Linear Technology Electronic Components Datasheet


LM385-2.5

Micropower Voltage Reference



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LM385-2.5 pdf
FEATURES
s 20µA to 20mA Operating Range
s Guaranteed 1% Initial Voltage Tolerance
s Guaranteed 1Dynamic Impedance
s Very Low Power Consumption
U
APPLICATIO 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Thermocouple Cold Junction Compensator
IQ 50µA
2 MERCURY
CELLS 2.6V
16k
1M
LM385-2.5
TYPE K
100k W.W.
ZERO
950
+
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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LM385-2.5 pdf
LM185-2.5/
LM285-2.5/LM385-2.5
ABSOLUTE AXI U RATI GS (Note 1)
Reverse Breakdown Current ................................ 30mA
Forward Current .................................................. 10mA
Operating Temperature Range
LM185-2.5 (OBSOLETE) ............ –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 (OBSOLETE) ............ – 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
BOTTOM VIEW
ORDER PART
NUMBER
H PACKAGE
2-LEAD TO-46 METAL CAN
TJMAX = 150°C, θJA = 440°C/W, θJC = 80°C/W
LM185H-2.5
LM285H-2.5
LM385H-2.5
LM385BH-2.5
(NOTE 3)
OBSOLETE PACKAGE
Consider the S8 or Z Packages for Alternate Source
TOP VIEW
NC 1
NC 2
8
7 NC
NC 3
6
45
S8 PACKAGE
8-LEAD PLASTIC SO
NC
(DO NOT
USE)
TJMAX = 150°C, θJA = 220°C/W
BOTTOM VIEW
Z PACKAGE
3-LEAD TO-92 PLASTIC
TJMAX = 100°C, θJA = 160°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LM285Z-2.5
LM385Z-2.5
LM385BZ-2.5
(NOTE 3)
ORDER PART
NUMBER
LM285S8-2.5
LM385S8-2.5
LM385BS8-2.5
S8 PART MARKING
2852
3852
3852B
2



Part Number LM385-2.5
Description Micropower Voltage Reference
Maker Linear Technology - Linear Technology
Total Page 8 Pages
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