Datasheet

-0.5
InputCommon-ModeVoltage(V)
14
12
10
8
6
4
2
0
RMSNoise( V)m
14
12
10
8
6
4
2
0
INL(ppmofFSR)
5.50 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Linearity
Noise
-40 -20 0 20 40 60 80 100
T °emperature( C)
12
10
8
6
4
2
0
RMSNoise( V)m
120 125
High-SpeedMode
High-ResolutionMode
Low-SpeedMode
Low-PowerMode
0 0.5
V (V)
REF
12
10
8
6
4
2
0
Noise( V)m
3.51.0 1.5 2.0 2.5 3.0
See forElectricalCharacteristics V OperatingRange.
REF
Low-Power
High-Speed
Low-Speed
High-Resolution
10k 100k
CLK(Hz)
0
-20
-40
-60
-80
-100
-120
-140
THD(dB)
14
12
10
8
6
4
2
0
NoiseRMS( V)m
100M1M 10M
High-SpeedMode
f >32.768MHz:V =2.048V,DVDD=2.1V
THD:A =f /5120, 0.5dBFS
CLK REF
IN CLK
-
Noise:ShortedInput
Noise
THD
10 100 1k
InputFrequency(Hz)
0
-20
-40
-60
-80
-100
-120
Common-ModeRejection(dB)
10k 100k 1M
10 100 1k
Power-SupplyModulationFrequency(Hz)
0
-20
-40
-60
-80
-100
-120
Power-SupplyRejection(dB)
10k 100k 1M
AVDD
IOVDD
DVDD
ADS1274
ADS1278
www.ti.com SBAS367F –JUNE 2007– REVISED FEBRUARY 2011
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.
NOISE AND LINEARITY
vs INPUT COMMON-MODE VOLTAGE NOISE vs TEMPERATURE
Figure 43. Figure 44.
TOTAL HARMONIC DISTORTION AND NOISE
NOISE vs REFERENCE VOLTAGE vs CLK
Figure 45. Figure 46.
COMMON-MODE REJECTION POWER-SUPPLY REJECTION
vs INPUT FREQUENCY vs POWER-SUPPLY FREQUENCY
Figure 47. Figure 48.
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