LTZ1000 Datasheet, PDF (1/8 Pages) Linear Technology – Ultra Precision Reference

FEATURES
n _{1.2μVP-P Noise}
n _{2μV/√kHr Long-Term Stability}
n _{Very Low Hysteresis}
n _{0.05ppm/°C Drift}
n _{Temperature Stabilized}
n _{400°C/W Thermal Resistance for LTZ1000A Reduces}
Insulation Requirements
n _{Specified for –55°C to 125°C Temperature Range}
n _{Offered in TO-99 package}
APPLICATIONS
n _Voltmeters
n _Calibrators
n _{Standard Cells}
n _Scales
n _{Low Noise RF Oscillators}
LTZ1000/LTZ1000A
Ultra Precision Reference
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 and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
LTZ1000
120Ω
Low Noise Reference
V_IN ≥ 10V
OUTPUT
30k
3₊ 7
LT^®1006
6
1N4148
2_–
4
0.02μF
1000 TA01
Long-Term Stability
2
0
–2
0
10
20
30
DAYS
LONG-TERM STABILITY OF A TYPICAL DEVICE FROM TIME = 0
WITH NO PRECONDITIONING OR AGING
1000 TA01b
1000afc
1