Datasheet

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SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007
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14
TYPICAL CHARACTERISTICS (continued)
T
A
= 25°C, AVDD = 5V, DVDD = 1.8V, f
CLK
= 27MHz, VREFP = 2.5V, VREFN = 0V, unless otherwise noted.
Figure 37
OFFSET AND GAIN ERROR vs V
REF
0.5
100
75
50
25
0
−
25
−
50
400
300
200
100
0
−
100
−
200
1.0 1.5 2.0
V
REF
(V)
Normalized Offset (
µ
V)
Normalized Gain Error (ppm)
2.5 3.0
See Electrical Characteristics for V
REF
Operating Range
Offset
Gain Error
Figure 38
NOISE vs V
REF
0.5
12
10
8
6
4
2
0
1.0 1.5
V
REF
and Common−Mode Input Voltage (V)
RMS Noise (
µ
V)
2.0 2.5 3.0
High−Speed
Low−Power
High−Resolution
See Electrical Characteristics for V
REF
Operating Range
Figure 39
INTEGRAL NONLINEARITY vs V
REF
0.5
12
10
8
6
4
2
0
1.0 1.5
V
REF
(V)
INL (ppm)
2.0 2.5 3.0
See Electrical Characteristics for V
REF
Operating Range
Figure 40
TOTAL HARMONIC DISTORTION vs V
REF
0.5
−
100
−
105
−
110
−
115
−
120
1.51.0
V
REF
(V)
THD (dB)
2.0 2.5
High−Speed Mode
f
IN
=1kHz,
−
0.5dBFS
See Electrical Characteristics for V
REF
Operating Range
Figure 41
COMMON−MODE REJECTION RATIO
vs FREQUENCY
10 100 1k
Common−Mode Signal Frequency (Hz)
0
−
20
−
40
−
60
−
80
−
100
−
120
−
140
CMRR (dB)
10k 1M100k
High−Speed Mode
Figure 42
NOISE AND OFFSET
vs COMMON−MODE INPUT VOLTAGE
−
0.5 0.50
20
18
16
14
12
10
8
6
4
2
0
1.0 1.5
Common−Mode Input Voltage (V)
RMS Noise (
µ
V)
70
50
30
10
−
10
−
30
−
50
−
70
−
90
−
110
−
130
Normalized Offset (
µ
V)
2.0 2.5 3.5 4.5 5.03.0 4.0
High−Speed Mode
Offset
Noise