Datasheet

74
73.8
73.6
73.4
73.2
73
72.8
72.6
72.4
72.2
72
2.5
5
ReferenceVoltage(V)
Signal-to-NoiseandDistortion(dB)
3 4
AVDD=5V
f =2kHz
IN
3.5 4.5
74
73.8
73.6
73.4
73.2
73
72.8
72.6
72.4
72.2
72
0
120
Frequency(kHz)
Signal-to-NoiseandDistortion(dB)
20 6040 10080
AVDD=3V
Throughput=2MSPS
92.5
92
91.5
91
90.5
90
89.5
89
2.7
5.7
AVDD,AnalogSupplyVoltage(V)
Spurious-FreeDynamicRange(dB)
3.2 4.7
f =2kHz
IN
4.23.7 5.2
91.9
91.85
91.8
91.75
91.7
91.65
-40
125
Free-AirTemperature( C)°
Spurious-FreeDynamicRange(dB)
-25 20
AVDD=3V
f =2kHz
IN
5-10 35 50 65 80 95 110
94
93.5
93
92.5
92
91.5
91
90.5
90
0
120
InputFrequency(kHz)
Spurious-FreeDynamicRange(dB)
20 6040 100
AVDD=3V
80
90.35
90.3
90.25
90.2
90.15
90.1
90.05
90
2.5
5
MeasuredReference,V (V)
REF
Spurious-FreeDynamicRange(dB)
3 43.5 4.5
AVDD=5V
f =2kHz
IN
ADS7947
ADS7948
ADS7949
www.ti.com SLAS708 –SEPTEMBER 2010
TYPICAL CHARACTERISTICS: ADS7947 (12-Bit) (continued)
At T
A
= +25°C, DVDD = 1.8V, V
REF
= 2.5V, and f
SAMPLE
= 2MSPS, unless otherwise noted.
SINAD vs REFERENCE VOLTAGE SINAD vs INPUT FREQUENCY
Figure 24. Figure 25.
SFDR vs AVDD SFDR vs TEMPERATURE
Figure 26. Figure 27.
SFDR vs REFERENCE VOLTAGE SFDR vs INPUT FREQUENCY
Figure 28. Figure 29.
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