LT1021_15 Datasheet, PDF (1/16 Pages) Linear Technology – Precision Reference

LT1021
Precision Reference
FEATURES
■ _{Ultralow Drift: 5ppm/°C Max Slope}
■ _{Very Low Noise: <1ppm P-P (0.1Hz to 10Hz)}
■ _{100% Noise Tested}
■ _{Pin Compatible with Most Bandgap Reference}
Applications, Including Ref 01, Ref 02, LM368,
MC1400 and MC1404 with Greatly Improved
Stability, Noise and Drift
■ _{Trimmed Output Voltage}
■ _{Operates in Series or Shunt Mode}
■ _{Output Sinks and Sources in Series Mode}
■ _{>100dB Ripple Rejection}
■ _{Minimum Input/Output Differential of 1V}
■ _{Available in 5-Lead Can, N8 and S8 Packages}
U
APPLICATIO S
■ _{A/D and D/A Converters}
■ _{Precision Regulators}
■ _{Digital Voltmeters}
■ _{Inertial Navigation Systems}
■ _{Precision Scales}
■ _{Portable Reference Standard}
TYPICAL APPLICATIO
Basic Positive and Negative Connections
LT1021
V_IN
IN
OUT
V_OUT
GND
LT1021
(7 AND 10 ONLY)
NC IN
OUT
GND
R1 =
V_OUT – (V ^– )
I_LOAD + 1.5mA
–V_OUT
R1
–15V
(V ^–)
1021 TA01
DESCRIPTIO
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
units can be used as shunt regulators (two-terminal zeners)
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.
The LT1021 references are based on a buried zener diode
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.
Unique circuit design makes the LT1021 the first IC
reference to offer ultralow drift without the use of high
power on-chip heaters.
The LT1021-7 uses no resistive divider to set output
voltage, and therefore exhibits the best long term stability
and temperature hysteresis. The LT1021-5 and LT1021-
10 are intended for systems requiring a precise 5V or 10V
reference with an initial tolerance as low as ±0.05%.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical Distribution of Temperature Drift
24
DISTRIBUTION
21
OF THREE RUNS
18
15
12
9
6
3
–0
–5 –4 –3 –2 –1 0 1 2 3 4 5
OUTPUT DRIFT (ppm/°C)
1021 TA01
1021fc
1