LT1021
Precision Reference
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DESCRIPTIO
FEATURES
The LT®1021 is a precision 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. Three
voltages are available: 5V, 7V and 10V. The 7V and 10V
unitscanbeusedasshuntregulators(two-terminalzeners)
with the same precision characteristics as the three-
terminal connection. Special care has been taken to mini-
mize thermal regulation effects and temperature
induced hysteresis.
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Ultralow Drift: 5ppm/°C Max Slope
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Very Low Noise: <1ppm P-P (0.1Hz to 10Hz)
100% Noise Tested
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Pin Compatible with Most Bandgap Reference
Applications, Including Ref 01, Ref 02, LM368,
MC1400 and MC1404 with Greatly Improved
Stability, Noise and Drift
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Trimmed Output Voltage
Operates in Series or Shunt Mode
Output Sinks and Sources in Series Mode
>100dB Ripple Rejection
TheLT1021referencesarebasedonaburiedzenerdiode
structure that 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 bandgap references.
Minimum Input/Output Differential of 1V
Available in 5-Lead Can, N8 and S8 Packages
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APPLICATIO S
Unique circuit design makes the LT1021 the first IC
reference to offer ultralow drift without the use of high
power on-chip heaters.
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A/D and D/A Converters
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Precision Regulators
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Digital Voltmeters
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Inertial Navigation Systems
The LT1021-7 uses no resistive divider to set output
voltage,andthereforeexhibitsthebestlongtermstability
and temperature hysteresis. The LT1021-5 and LT1021-
10areintendedforsystemsrequiringaprecise5Vor10V
reference with an initial tolerance as low as ±0.05%.
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Precision Scales
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Portable Reference Standard
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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TYPICAL APPLICATIO
Typical Distribution of Temperature Drift
24
Basic Positive and Negative Connections
DISTRIBUTION
OF THREE RUNS
21
18
15
12
9
LT1021
LT1021
GND
(7 AND 10 ONLY)
V
IN
IN
V
OUT
IN
OUT
NC
OUT
GND
–V
OUT
–
V
OUT
– (V )
R1 =
6
R1
–15V
I
+ 1.5mA
LOAD
3
–
(V
)
1021 TA01
– 0
–5 –4 –3 –2 –1
0
1
2
3
4
5
OUTPUT DRIFT (ppm/°C)
1021 TA01
1021fc
1