Datasheet
RMS Noise (
µ
V)
V
REF
(V)
16
14
12
10
8
6
4
2
0
0.5 1.5 5.52.5 3.5 4.5
DRATE[1:0] = 11
DRATE[1:0] = 10
DRATE[1:0] = 01
DRATE[1:0] = 00
RMS Noise (
µ
V)
DVDD, AVDD−AVSS (V)
20
18
16
14
12
10
8
6
4
2.5 3.0 5.53.5 4.0 4.5 5.0
DRATE[1:0] = 11
from DVDD
from AVDD−AVSS
RMS Noise (
µ
V)
Temperature (
_
C)
20
18
16
14
12
10
8
6
4
−
40
−
20 0
20 40 60 80 100
DRATE[1:0] = 11
RMS Noise (
µ
V)
Common−Mode Input Voltage (V)
20
15
10
5
0
Offset (
µ
V)
5
0
−
5
−
10
−
15
−
3
−
2 3
−
1 0 1 2
OFFSET
CHOP = 1
OFFSET
CHOP = 0
NOISE
Number of Occurrences
Offset (
µ
V)
200
180
160
140
120
100
80
60
40
20
0
−
10
−
8
−
6
−
4
−
2
0
2
4
6
8
10
311 units from one production lot.
CHOP = 1
Number of Occurrences
Offset Drift (
µ
V/
_
C)
80
60
40
20
0
−
0.10
−
0.09
−
0.08
−
0.07
−
0.06
−
0.05
−
0.04
−
0.03
−
0.02
−
0.01
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
50 units from two
production lots.
Based on 20
_
C intervals
over the range of
−
40
_
C to +105
_
C.
CHOP = 1
ADS1258-EP
SBAS445D –MARCH 2009– REVISED MARCH 2011
www.ti.com
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.
NOISE vs V
REF
NOISE vs SUPPLY VOLTAGE
Figure 10. Figure 11.
NOISE AND OFFSET vs
NOISE vs TEMPERATURE COMMON-MODE INPUT VOLTAGE
Figure 12. Figure 13.
OFFSET HISTOGRAM OFFSET DRIFT HISTOGRAM
Figure 14. Figure 15.
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