ADS8661 Datasheet, PDF (16/71 Pages) Texas Instruments – 12-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges

ADS8661, ADS8665
SBAS780 – DECEMBER 2016
www.ti.com
Typical Characteristics (continued)
at T_A = 25°C, AVDD = 5 V, DVDD = 3 V, V_REF = 4.096 V (internal), and maximum throughput (unless otherwise noted)
0.5
1
Maximum
Minimum
± 12.288 V
± 5.12 V
0-10.24 V
0.75
± 10.24 V
± 2.56 V
0-6.144 V
± 6.144 V
0-12.288 V
0-5.12 V
0.25
0.5
0.25
0
0
-0.25
-0.25
-0.5
-0.75
-0.5
-40
-7
26
59
92
Free-Air Temperature (qC)
125
D015
-1
-40
-7
26
59
92
Free-Air Temperature (⁰C)
125
D036
Figure 27. INL vs Temperature (All Unipolar Ranges)
12.5
10
0.025
0.015
Figure 28. Offset Error vs
Temperature Across Input Ranges
± 12.288 V
± 10.24 V
± 6.144 V
± 5.12 V
± 2.56 V
0-12.288 V
0-10.24 V
0-6.144 V
0-5.12 V
7.5
0.005
5
-0.005
2.5
-0.015
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3
Offset Drift (ppm/ºC)
D037
-0.025
-40
-7
26
59
92
Free-Air Temperature (⁰C)
125
D038
Figure 29. Typical Histogram for Offset Drift
25
20
15
10
5
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Gain Drift (ppm/ºC)
D039
Figure 30. Gain Error vs Temperature Across Input Ranges
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
0
± 12.288 V
± 10.24 V
± 6.144 V
± 5.12 V
± 2.56 V
0-12.288 V
0-10.24 V
0-6.144 V
0-5.12 V
2000
4000
6000
Source Resistance (:)
8000
10000
D040
Figure 31. Typical Histogram for Gain Error Drift
Figure 32. Gain Error vs External Resistance (R_EXT)
16
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