Datasheet

"#$$%
SBVS021A − OCTOBER 1988 − REVISED APRIL 2007
www.ti.com
4
TYPICAL CHARACTERISTICS
At T
A
= +25°C and V
S
= ±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
Full−Scale Frequency (Hz)
R
IN
=40k
Ω
−
50
Temperature (
_
C)
QUIESCENT CURRENT vs TEMPERATURE
18
16
14
12
10
8
6
4
2
0
Quiescent Current (mA)
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
V
REF
(V)
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
Full−Scale Frequency (ppm/
_
C)
100k 1M 10M
AGrade
10k
Full−Scale Frequency (Hz)
JITTER vs FULL−SCALE FREQUENCY
500
400
300
200
100
0
Jitter (ppm)
100k 1M 10M
Jitter is the ratioofthe1
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
Frequency Repeatability (%)
0.0001
0.0002
0.0004
0.0006
0.0008
10ms 100ms 1s
17
Repeatability (Bits)
18
19
This graph describes the low frequency stability of the VFC110:
the ratio of the 1σ 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