Datasheet

Normalized Offset (
µ
V)
Temperature (
_
C)
20
0
−
20
−
40
−
60
−
40
−
20 1000 20 806040
CHOP = 1
CHOP = 1, No Buffer
CHOP = 0, No Buffer
50 units from two production lots.
Normalized Offset (
µ
V)
V
REF
(V)
0.5 1.0
10
8
6
4
2
0
−
2
−
4
−
6
−
8
−
10
5.51.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Normalized Offset (
µ
V)
Time After Power−On (s)
10
8
6
4
2
0
−
2
−
4
−
6
−
8
−
10
0 10 6020 30 40 50
Free−Air
Number of Occurrences
Absolute Gain Error (ppm)
80
60
40
20
0
100 300 500 700 900
1100 1300 1500 1700 1900
320 units from one production lot.
Normalized Gain Error (ppm)
Temperature (
_
C)
30
20
10
0
−
10
−
40
−
20 100
0 20 806040
Number of Occurrences
Gain Drift (ppm/
_
C)
80
60
40
20
0
−
1.8
−
1.6
−
1.4
−
1.2
−
1.0
−
0.8
−
0.6
−
0.4
−
0.2
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
50 units from two production lots.
Based on 20
_
C intervals over the
range of
−
40
_
C to +105
_
C.
ADS1258-EP
www.ti.com SBAS445D –MARCH 2009– REVISED MARCH 2011
TYPICAL CHARACTERISTICS (continued)
At T
A
= +25°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = +3.3V, f
CLK
= 16MHz (external clock) or f
CLK
= 15.729MHz (internal
clock), OPA227 buffer between MUX outputs and ADC inputs, VREFP = +2.048V, and VREFN = –2.048V, unless otherwise
noted.
OFFSET vs TEMPERATURE OFFSET vs V
REF
Figure 16. Figure 17.
OFFSET POWER-ON WARMUP GAIN ERROR HISTOGRAM
Figure 18. Figure 19.
GAIN DRIFT HISTOGRAM GAIN ERROR vs TEMPERATURE
Figure 20. Figure 21.
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