ADS1274
ADS1278
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SBAS367–JUNE 2007
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, High-Speed mode, AVDD = +5V, DVDD = +1.8V, IOVDD = +3.3V, fCLK = 27MHz, VREFP = 2.5V, and
VREFN = 0V, unless otherwise noted.
ADS1278 REFERENCE INPUT DIFFERENTIAL
IMPEDANCE vs TEMPERATURE
ANALOG INPUT DIFFERENTIAL IMPEDANCE
vs TEMPERATURE
0.68
0.67
0.66
0.65
0.64
0.63
0.62
6.8
6.7
6.6
6.5
6.4
6.3
6.2
14.4
14.3
14.2
14.1
14.0
13.9
13.8
13.7
13.6
13.5
13.4
28.8
28.6
28.4
28.2
28.0
27.8
27.6
27.4
27.2
27.0
26.8
High-Speed and
High-Speed and
High-Resolution Modes
High-Resolution Modes
Low-Speed Mode
Low-Power Mode
-40 -20
0
20
40
60
80
100 120 125
-40 -20
0
20
40
60
80
100 120 125
Temperature (°C)
Temperature (°C)
Figure 37.
Figure 38.
ANALOG INPUT DIFFERENTIAL IMPEDANCE
vs TEMPERATURE
INTEGRAL NONLINEARITY
vs TEMPERATURE
155
10
8
Low-Speed Mode
150
145
140
135
130
125
120
115
6
4
2
0
-40 -20
0
20
40
60
80
100 120 125
-40 -20
0
20
40
60
80
100 120 125
Temperature (°C)
Temperature (°C)
Figure 39.
Figure 40.
LINEARITY ERROR
vs INPUT LEVEL
LINEARITY AND TOTAL HARMONIC DISTORTION
vs REFERENCE VOLTAGE
10
14
12
10
8
-100
THD: fIN = 1kHz, VIN = -0.5dBFS
8
6
-104
-108
-112
-116
-120
-124
-128
T = +105°C
4
T = +25°C
THD
2
0
6
-2
-4
-6
-8
-10
4
Linearity
T = -40°C
T = +125°C
2
See Electrical Characteristics for VREF Operating Range.
0
-2.5 -2.0 -1.5 -1.0 -0.5
0
0.5 1.0 1.5 2.0 2.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
VIN (V)
VREF (V)
Figure 41.
Figure 42.
16
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