ADS7950_15 Datasheet, PDF (20/70 Pages) Texas Instruments – Single-Ended, MicroPower, Serial Interface ADCs

ADS7950, ADS7951, ADS7952, ADS7953, ADS7954, ADS7955
ADS7956, ADS7957, ADS7958, ADS7959, ADS7960, ADS7961
SLAS605B – JUNE 2008 – REVISED JULY 2015
www.ti.com
Typical Characteristics (12-Bit Devices Only) (continued)
Variations for 10-bit and 8-bit devices are too small to be illustrated through the characteristic curves
1
+VBD = 1.8 V,
0.8
f_S = 1 MSPS,
0.6 ^TA ^{= 25°C}
1
0.8
+VA = 5.5 V,
f_S = 1 MSPS,
0.6 ^TA ^{= 25°C}
0.4
0.4
0.2
0.2
0
0
-0.2
-0.4
-0.6
-0.8
-1
2.7
3.4
4.1
4.8
5.5
+VA - Supply Voltage - V
-0.2
-0.4
-0.6
-0.8
-1
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 5.5
+VBD - Interace Supply - V
Figure 17. Gain Error vs Supply Voltage
2
+VA = 5.5 V,
1.8 _{+VBD = 1.8 V,}
1.6 ^{fS = 1 MSPS}
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-40
15
70
125
T_A - Free-Air Temperature - °C
Figure 19. Offset Error vs Free-Air Temperature
72
71.5
71
70.5
70
69.5
69
2.7
+VBD = 3 V,
f_S = 1 MSPS,
f_IN = 100 kHz
T_A = 25°C
3.4
4.1
4.8
5.5
+VA - Supply Voltage - V
Figure 18. Gain Error vs Interface Supply Voltage
1
0.9
+VA = 5.5 V,
+VBD = 1.8 V,
0.8 ^{fS = 1 MSPS}
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
15
70
125
T_A - Free-Air Temperature - °C
Figure 20. Gain Error vs Free-Air Temperature
72
71.5
71
70.5
70
69.5
69
2.7
+VBD = 3 V,
f_S = 1 MSPS,
f_IN = 100 kHz
T_A = 25°C
3.4
4.1
4.8
5.5
+VA - Supply Voltage - V
Figure 21. Signal-to-Noise Ratio vs Supply Voltage
Figure 22. Signal-to-Noise + Distortion vs Supply Voltage
20
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