LM185-2.5/
LM285-2.5/LM385-2.5
Micropower Voltage
Reference
FEATURES
s
s
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DESCRIPTIO
20µA to 20mA Operating Range
Guaranteed 1% Initial Voltage Tolerance
Guaranteed 1Ω Dynamic Impedance
Very Low Power Consumption
APPLICATI
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Portable Meter References
Portable Test Instruments
Battery-Operated Systems
Panel Meters
Current Loop Instrumentation
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
1Ω, 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
I
Q
≈
50µA
16k
1M
2 MERCURY
CELLS 2.6V
LM385-2.5
950Ω
450Ω
10k ADJUST
FOR 12.17mV
AT 25°C
ACROSS 450Ω
LM185-2.5 TA01
OUTPUT VOLTAGE CHANGE (mV)
V
IN
LM334
100k W.W.
ZERO
V
–
R
SET
2k
TYPE K
+
–
METER
U
Reverse Voltage Change
16
–55°C
≤
T
A
≤
+125°C
12
8
4
0
–4
0.01
0.1
1
10
REVERSE CURRENT (mA)
100
LM185-2.5 TA02
UO
UO
1
LINER [ LINEAR TECHNOLOGY ]
