LM2851.2, LM3851.2, LM385B1.2

MICROPOWER VOLTAGE REFERENCES

SLVS075H − APRIL 1989 − REVISED FEBRUARY 2005

6

POST OFFICE BOX 655303

Figure 5

REFERENCE IMPEDANCE

vs

REFERENCE CURRENT

IZ − Reference Current − mA

TA = −55°C to 125°C

f = 25 Hz

100

10

1

0.1

100

10

1

0.1

0.01

Figure 6

NOISE VOLTAGE

vs

FREQUENCY

f − Frequency − Hz

700

600

500

400

300

200

100

0

10

100

1 k

10 k

100 k

IZ = 100 µA

TA = 25°C

f − Cutoff Frequency − kHz

100

10

1

0.1

70

60

50

40

30

20

10

0

IZ = 100 µA

TA = 25°C

OUTPUT NOISE VOLTAGE

vs

CUTOFF FREQUENCY

RC Low Pass

C

R

100

µA

Figure 7

Figure 8

Input

VI

t − Time −

µs

0

100

500

600

0

5

0

0.5

1

1.5

VO

36 k

Ω

TRANSIENT RESPONSE

Output

† Data at high and low temperatures are applicable only within the rated operating free-air temperature ranges of the various devices.