Datasheet

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SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007
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12
TYPICAL CHARACTERISTICS (continued)
T
A
= 25°C, AVDD = 5V, DVDD = 1.8V, f
CLK
= 27MHz, VREFP = 2.5V, VREFN = 0V, unless otherwise noted.
Figure 25
REFERENCE INPUT DIFFERENTIAL IMPEDANCE
vs TEMPERATURE
−
40
−
20 0 20 40 60 80 100
Temp erature (
_
C)
4280
4260
4240
4220
4200
4180
4160
4140
4120
4100
Reference Input Impedance (
Ω
)
120125
High−Speed and
High−Resolution Modes
Figure 26
REFERENCE INPUT DIFFERENTIAL IMPEDANCE
vs TEMPERATURE
−
40
−
20 0 20 40 60 80 100
Temperature (
_
C)
8900
8800
8700
8600
8500
8400
8300
8200
Reference Input Impedance (
Ω
)
120 125
Low−Power Mode
Figure 27
ANALOG INPUT DIFFERENTIAL IMPEDANCE
vs TEMPERATURE
−
40
−
20 0 20 40 60 80 100
Temp erature (
_
C)
16550
16500
16450
16400
16350
16300
16250
16200
16150
Analog Input Impedance (
Ω
)
120125
High−Speed and
High−Resolution Modes
Figure 28
ANALOG INPUT DIFFERENTIAL IMPEDANCE
vs TEMPERATURE
−
40
−
20 0 20 40 60 80 100
Temp erature (
_
C)
33200
33000
32800
32600
32400
32200
32000
Analog Input Impedance (
Ω
)
120125
Low−Power Mode
Figure 29
INTEGRAL NONLINEARITY vs TEMPERATURE
−
40
−
20 0 20 40 60 80 100
Temperature (
_
C)
14
12
10
8
6
4
2
0
INL (ppm)
120 125
High−Resolution
High−Speed
Low−Power
Figure 30
LINEARITY ERROR vs INPUT LEVEL
−
2.5
−
2.0 2.0
−
1.5 1.5
−
1.0 1.0
−
0.5 0.50
V
IN
(V)
10
8
6
4
2
0
−
2
−
4
−
6
−
8
−
10
Linearity Error (ppm)
2.5
High−Speed Mode
T=+25
_
C
T=+125
_
C
T=+105
_
C
T=
−
40
_
C