Texas Instruments ADS869 Series Manual page 30

ADS8694, ADS8698
SBAS686 – JULY 2015
The AUX channel in the ADS8694 and ADS8698 offers a true 16-bit performance with no missing codes. Some
typical performance characteristics of the AUX channel are shown in
8000
6000
4000
2000
0
32763 32764 32765 32766 32767 32768 32769 32770 32771
Mean = 32767.15, sigma = 0.83
Figure 65. DC Histogram for Mid-Scale Input
(AUX Channel)
0
±20
±40
±60
±80
±100
±120
±140
±160
0 50000 100000
Input Frequency (Hz)
f = 1 kHz, SNR = 88.2 dB, SINAD = 88.1 dB, THD = –102 dB,
IN
SFDR = 102 dB, number of points = 64k
Figure 67. Typical FFT Plot
(AUX Channel)
30 Submit Documentation Feedback
Codes (LSB)
150000 200000 250000
C052
Product Folder Links:
Figure 65
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
-40 -7
Free-Air temperature (
C050
Figure 66. Offset and Gain vs Temperature
90
SNR
89
SINAD
88
87
86
-40 -7
Figure 68. SNR, SINAD, and THD vs Temperature
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ADS8694 ADS8698
www.ti.com
to Figure 68.
Offset Error
Gain Error
26 59 92 125
o
C)
AUX channel
(AUX Channel)
THD
26 59 92 125
Free-Air Temperature ( o C)
f = 1 kHz
IN
(AUX Channel)
0.5
0.4
0.3
0.2
0.1
0
C051
-100
-101
-102
-103
-104
-105
C053