LTZ1000/LTZ1000A

6

1000afd

Adjusting Temperature Coefficient in Unstabilized Applications

Typical applicaTions

–

+

7

5

4

3

2

3

120

LT1006

4

6

2

1

70k

15V

1N4148

0.022µF

R1

200*

HEATER

1N4148

1 MIN

1 MIN

OFF

ON

*

* PULSE HEATER ON AND OFF TO HEAT AND COOL THE REFERENCE. ADJUST

R1 FOR MINIMUM VOLTAGE CHANGE THROUGH A TEMPERATURE CYCLE.

1000 TA05

Averaging Reference Voltage for Lower Noise and Better Stability

Improving Supply Rejection

1.6k

0.01%

OUTPUT

1.6k

30*

30*

150

150

*R = kT

1000 TA03

15V

1.5k

150

SUPPLY REJECTION AT

SUPPLY REJECTION

50

1000 TA04

7V Positive Reference Circuit

–

+

–

+

2N3904

1N4148

1N4148

A2

LT1013

A1

LT1013

1M

1

1

7

5

3

3

4

4

8

8

5

7

6

1k

2

2

0.1µF

0.002µF

0.1µF

400k*

10k

R4

13k

R1

120

R3

70k

R2

70k

R5

1k

ZENER – SENSE

ZENER + SENSE

GROUND

ZENER – FORCE

HEATER RETURN

(TIED TO GROUND)

*PROVIDES TC COMPENSATION, DELETE FOR LTZ1000A

APPROXIMATE CHANGE IN REFERENCE VOLTAGE FOR A 100ppm (0.01%) CHANGE IN RESISTOR VALUES:

R1

R2

R3

R4/R5 RATIO

∆R()

0.012

7

7

∆R = 0.01%

1ppm

0.3ppm

0.2ppm

1ppm

BOTH A1 AND A2 CONTRIBUTE LESS THAN 2µV OF OUTPUT DRIFT OVER A 50°C RANGE

1000 TA06