LM385-2.5_15 Datasheet, PDF (1/8 Pages) Linear Technology – Micropower Voltage Reference

FEATURES
s _{20µA to 20mA Operating Range}
s _{Guaranteed 1% Initial Voltage Tolerance}
s _{Guaranteed 1Ω Dynamic 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
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Thermocouple Cold Junction Compensator
I_Q ≈ 50µA
2 MERCURY
CELLS 2.6V
16k
1M
LM385-2.5
TYPE K
100k W.W.
ZERO
950Ω
+
–
METER
V_IN
LM334
R_SET
V^–
2k
450Ω
10k ADJUST
FOR 12.17mV
AT 25°C
ACROSS 450Ω
LM185-2.5 TA01
Reverse Voltage Change
16
–55°C ≤ T_A ≤ +125°C
12
8
4
0
–4
0.01
0.1
1
10
100
REVERSE CURRENT (mA)
LM185-2.5 TA02
1