LTZ1000/LTZ1000A
Ultra Precision Reference
FeaTures
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DescripTion
The LTZ1000 and LTZ1000A are ultra-stable temperature
controllable references. They are designed to provide 7V
outputs with temperature drifts of 0.05ppm/°C, about
1.2µV
P-P
of noise and long-term stability of 2µV/√kHr.
Included on the chip is a subsurface zener reference, a
heater resistor for temperature stabilization, and a tem-
perature sensing transistor. External circuitry is used to
set operating currents and to temperature stabilize the
reference. This allows maximum flexibility and best long-
term stability and noise.
The LTZ1000 and LTZ1000A references can provide su-
perior performance to older devices such as the LM199,
provided that the user implements the heater control and
properly manages the thermal layout. To simplify thermal
insulation, the LTZ1000A uses a proprietary die attach
method to provide significantly higher thermal resistance
than the LTZ1000.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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1.2µV
P-P
Noise
2µV/√kHr Long-Term Stability
Very Low Hysteresis
0.05ppm/°C Drift
Temperature Stabilized
400°C/W Thermal Resistance for LTZ1000A Reduces
Insulation Requirements
Specified for –55°C to 125°C Temperature Range
Offered in TO-99 package
applicaTions
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Voltmeters
Calibrators
Standard Cells
Scales
Low Noise RF Oscillators
Typical applicaTion
Low Noise Reference
LTZ1000
V
IN
≥ 10V
OUTPUT
30k
3
7
6
1N4148
(ppm)
0
2
Long-Term Stability
+
–
LT
®
1006
2
4
120
0.02µF
–2
1000 TA01
0
10
DAYS
20
30
LONG-TERM STABILITY OF A TYPICAL DEVICE FROM TIME = 0
WITH NO PRECONDITIONING OR AGING
1000 TA01b
1000afd
1
LINER [ LINEAR TECHNOLOGY ]
