ADS7279 Datasheet, PDF (16/46 Pages) Texas Instruments – LOW-POWER, 14-BIT, 1MHz, SINGLE/DUAL UNIPOLAR INPUT, ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE

ADS7279
ADS7280
SBAS436 – MAY 2008........................................................................................................................................................................................................ www.ti.com
TYPICAL CHARACTERISTICS (continued)
At –40°C to +85°C, V_REF [(REF+) – (REF–)] = 5V when +VA = +VBD = 5V or V_REF [(REF+) – (REF–)] = 2.5V when +VA =
+VBD = 3V, f_SCLK = 42MHz, or V_REF = 2.5 when +VA = +VBD = 2.7V, f_SCLK = 37.8MHz; f_i = dc for dc curves, f_i = 100kHz for ac
curves with 5V supply and f_i = 10kHz for ac curves with 3V supply, unless otherwise noted.
SIGNAL-TO-NOISE RATIO
vs INPUT FREQUENCY
90
SIGNAL-TO-NOISE AND DISTORTION
vs INPUT FREQUENCY
90
88
5V
86
88
5V
86
84
84
82
3V
80
0
20
40
60
80
100
Input Frequency (kHz)
Figure 18.
TOTAL HARMONIC DISTORTION
vs INPUT FREQUENCY
-85
3V
-90
5V
-95
82
80
0
105
3V
20
40
60
80
100
Input Frequency (kHz)
Figure 19.
SPURIOUS-FREE DYNAMIC RANGE
vs INPUT FREQUENCY
5V
100
3V
95
-100
90
-105
0
20
40
60
80
100
Input Frequency (kHz)
Figure 20.
SIGNAL-TO-NOISE RATIO
vs FULL-SCALE RANGE
86
f_IN = 10kHz
5V
82
3V
78
74
70
66
0
1
2
3
4
5
Full-Scale Range (V)
Figure 22.
85
0
20
40
60
80
100
Input Frequency (kHz)
Figure 21.
SIGNAL-TO-NOISE AND DISTORTION
vs FULL-SCALE RANGE
86
f_IN = 10kHz
5V
82
3V
78
74
70
66
0
1
2
3
4
5
Full-Scale Range (V)
Figure 23.
16
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