LT1031/LH0070
Precision 10V Reference
FEATURES
■ Pin Compatible with LH0070 and AD581*
■ Ultralow Drift—5ppm/°C Max Slope
■ Trimmed Output Voltage
■ Operates in Series or Shunt Mode
■ Output Sinks and Sources in Series Mode
■ Very Low Noise < 1ppmP-P 0.1Hz to 10Hz
■ > 100dB Ripple Rejection
■ Minimum Input Voltage of 11V
U
APPLICATIO S
■ A-to-D and D-to-A Converters
■ Precision Regulators
■ Digital Voltmeters
■ lnertial Navigation Systems
■ Precision Scales
■ Portable Reference Standard
DESCRIPTIO
The LT®1031 is a precision 10V reference with ultralow
drift and noise, extremely good long term stability, and
almost total immunity to input voltage variations. The
reference output will both source and sink up to 10mA and
can be used as a shunt regulator (two terminal Zener) with
the same precision characteristics as the three terminal
connection. Special care has been taken to minimize
thermal regulation effects and temperature induced
hysteresis.
The LT1031 reference is based on a buried Zener diode
structure which eliminates noise and stability problems
associated with surface breakdown devices. Further, a
subsurface Zener exhibits better temperature drift and
time stability than even the best band-gap references.
Unique circuit design makes the LT1031 the first three
terminal IC reference to offer ultralow drift without the
use of high power on-chip heaters. Output voltage is
pretrimmed to 0.05% accuracy.
The LT1031 can be used as a plug-in replacement for
the AD581 and LH0070,* with improved electrical and
thermal performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*See LH0070 Electrical Characteristics table and AD581 cross reference guide.
TYPICAL APPLICATIO
Basic Positive and
Negative Connections
LT1031
VIN IN
OUT VOUT
GND
LT1031
OUT
GND
– VOUT
R1 = VIN – VOUT
ILOAD + 1.5mA
R1
– VIN
LT1031 • TA01
Distribution of Output Accuracy
40
TA = 25°C
35 DISTRIBUTION
FROM 5 RUNS
30
25
20
15
10
5
0
–0.10 –0.06 –0.02 0 0.02 0.06 0.10
OUTPUT ACCURACY (%)
LT1031 TA02
1031fb
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