Datasheet

-40 -20 0 20 40 60 80 100
Temperature(°C)
0.68
0.67
0.66
0.65
0.64
0.63
0.62
ReferenceInputImpedance(k )W
6.8
6.7
6.6
6.5
6.4
6.3
6.2
ReferenceInputImpedance(k )W
120 125
High-Speedand
High-ResolutionModes
Low-SpeedMode
-40 -20 0 20 40 60 80 100
Temperature(°C)
14.4
14.3
14.2
14.1
14.0
13.9
13.8
13.7
13.6
13.5
13.4
AnalogInputImpedance(k )W
28.8
28.6
28.4
28.2
28.0
27.8
27.6
27.4
27.2
27.0
26.8
AnalogInputImpedance(k )W
120 125
Low-PowerMode
High-Speedand
High-ResolutionModes
-40 -20 0 20 40 60 80 100
Temperature(°C)
155
150
145
140
135
130
125
120
115
AnalogInputImpedance(k )W
120 125
Low-SpeedMode
-40 -20 0 20 40 60 80 100
Temperature( C)°
10
8
6
4
2
0
INL(ppmofFSR)
120 125
-2.0-2.5
V (V)
IN
10
8
6
4
2
0
-2
-4
-6
-8
-10
LinearityError(ppm)
2.5-1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0
T= 40 C- °
T=+25 C°
T=+125 C°
T=+105 C°
0
V (V)
REF
14
12
10
8
6
4
2
0
Linearity(ppm)
-100
-104
-108
-112
-116
-120
-124
-128
THD(dB)
3.5
THD
0.5 1.0 1.5 2.0 2.5 3.0
Linearity
THD:f =1kHz,V = 0.5dBFS
IN IN
-
See forElectricalCharacteristics V OperatingRange.
REF
ADS1274
ADS1278
SBAS367F –JUNE 2007–REVISED FEBRUARY 2011 www.ti.com
TYPICAL CHARACTERISTICS (continued)
At T
A
= +25°C, High-Speed mode, AVDD = +5V, DVDD = +1.8V, IOVDD = +3.3V, f
CLK
= 27MHz, VREFP = 2.5V, and
VREFN = 0V, unless otherwise noted.
ADS1278 REFERENCE INPUT DIFFERENTIAL ANALOG INPUT DIFFERENTIAL IMPEDANCE
IMPEDANCE vs TEMPERATURE vs TEMPERATURE
Figure 37. Figure 38.
ANALOG INPUT DIFFERENTIAL IMPEDANCE INTEGRAL NONLINEARITY
vs TEMPERATURE vs TEMPERATURE
Figure 39. Figure 40.
LINEARITY ERROR LINEARITY AND TOTAL HARMONIC DISTORTION
vs INPUT LEVEL vs REFERENCE VOLTAGE
Figure 41. Figure 42.
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