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7.7 Typical Characteristics
At T
= 25°C, AVDD = 5 V, DVDD = 3 V, internal reference V
A
15
---- ± 2.5*V
---- “ 1.25*V
REF,
---- “ 0.625*V
REF,
-------“0.156 V
9
REF,
---- + 1.25*V
REF,
---- + 0.3125*V
REF
3
±3
±9
±15
±10
±6
Figure 2. Input I-V Characteristic
350
---- ± 2.5*V
---- “ 0.625*V
280
-------“0.156 V
---- + 1.25*V
210
---- + 0.3125*V
140
70
0
-70
±40
±7
Free-Air Temperature (
Figure 4. Input Impedance Variation vs Temperature
3000
2500
2000
1500
1000
500
0
2045
2046
2047
Mean = 2048, sigma = 0.0, input = 0 V,
range = ±2.5 × V
Figure 6. DC Histogram for Mid-Scale Inputs (±2.5 × V
Copyright © 2015, Texas Instruments Incorporated
REF
------“0.3125*V
REF
---- + 2.5*V
REF
---- + 0.625*V
REF
2
6
±2
Input Voltage (V)
---- “ 1.25*V
REF,
REF
------“0.3125*V
REF,
REF
---- + 2.5*V
REF,
REF
---- + 0.625*V
REF,
REF
REF
26
59
92
o
C)
2048
2049
2050
2051
Output Codes
REF
Product Folder Links:
= 4.096 V, and f
REF
SAMPLE
15
9
3
±3
±9
±15
10
±10
±6
C001
Input range = ±2.5 × V
Figure 3. Input Current vs Temperature
800
640
480
320
160
0
125
0.85 0.88 0.91 0.94 0.97
C005
Number of samples = 1160
Figure 5. Typical Distribution of Input Impedance
3000
2500
2000
1500
1000
500
0
2045
2046
C007
Mean = 2048, sigma = 0.0, input = 0 V,
)
Figure 7. DC Histogram for Mid-Scale Inputs (±1.25 × V
REF
ADS8664 ADS8668
ADS8664, ADS8668
SBAS492 – JULY 2015
= 500 kSPS, unless otherwise noted.
----- -40
----- 25
----- 125
2
6
±2
Input Voltage (V)
REF
1
1.03 1.06 1.09 1.12 1.15
Input Impedance (M
)
2047
2048
2049
2050
Output Codes
range = ±1.25 × V
REF
Submit Documentation Feedback
0
C
0
C
0
C
10
C002
C006
2051
C008
)
REF
11
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