LTZ1000/LTZ1000A

1

1000afd

Typical applicaTion

FeaTures

applicaTions

DescripTion

Ultra Precision Reference

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

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.

Low Noise Reference

n

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

n

Voltmeters

n

Calibrators

n

Standard Cells

n

Scales

n

Low Noise RF Oscillators

Long-Term Stability

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.

–

+

LTZ1000

OUTPUT

1N4148

30k

3

7

4

6

2

0.02µF

120

1000 TA01

DAYS

0

–2

0

2

10

LONG-TERM STABILITY OF A TYPICAL DEVICE FROM TIME = 0

WITH NO PRECONDITIONING OR AGING

1000 TA01b

30

20