VFC110

SBVS021A − OCTOBER 1988 − REVISED APRIL 2007

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4

TYPICAL CHARACTERISTICS

At TA = +25°C and VS = ±15V, unless otherwise noted.

10pF

External One−Shot Capacitor

FULL−SCALE FREQUENCY

vs EXTERNAL ONE−SHOT CAPACITOR

100pF

1nF

10nF

100nF

10M

1M

100k

10k

R

IN =40kΩ

−50

Temperature (

_C)

QUIESCENT CURRENT vs TEMPERATURE

18

16

14

12

10

8

6

4

2

0

I

Q+

−25

0

25

50

75

100

125

I

Q

−

0

Output Current (mA)

REFERENCE VOLTAGE

vs REFERENCE LOAD CURRENT

5.01

5.00

4.99

4.98

4.97

4.96

2

4

6

8

10

12

14

16

18

20

22

Short−Circuit

Current Limit

10k

Full−Scale Frequency (Hz)

TYPICAL FULL−SCALE GAIN DRIFT

vs FULL−SCALE FREQUENCY

1000

100

10

100k

1M

10M

AGrade

10k

Full−Scale Frequency (Hz)

JITTER vs FULL−SCALE FREQUENCY

500

400

300

200

100

0

100k

1M

10M

Jitter is the ratio of the 1

σ value of the distribution of the period

(1/f

OUT, max) to the mean of the period.

FREQUENCY COUNT REPEATABILITY

vs COUNTER GATE TIME

1ms

Time

0 .001

0.0001

0.0002

0.0004

0.0006

0.0008

10ms

100ms

1s

17

18

19

This graph describes the low frequency stability of the VFC110:

the ratio of the 1

σ point of the distribution of 100 runs (where

each mean frequency came from 1000 readings for each gate

time) to the overall mean frequency.

f

FS = 100kHz

f

FS =1MHz