Rev. 10/30/00

SPX431L

*CALCULATING AVERAGE TEMPERATURE COEFFICEINT (TC)

TEST CIRCUITS

I

K

I

REF

V

IN

V

V

IN

V

KA

I

K

R

1

R

2

(V

TEST CIRCUIT 2

TEST CIRCUIT 1

V

IN

V

KA

I

K (OFF)

TEST CIRCUIT 3

I

REF

1G-38

1G-39

1G-40

∆T

∆V

REF

0

153045607590

105

-10

0.5

5000

0

0

0

0.07 mV/°C

0.003 %/°C

27 ppm/°C

TC in mV/°C =

TC in mV/°C =

∆V

∆T

A

∆T

A

∆V

∆V

REF

x 100

()

TC in ppm/°C =

∆T

A

∆V

∆V

REF

()