Datasheet
ADS1255
ADS1256
SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
www.ti.com
9
TYPICAL CHARACTERISTICS (continued)
T
A
= +25°C, AVDD = 5V, DVDD = 1.8V, f
CLKIN
= 7.68MHz, PGA = 1, and V
REF
= 2.5V, unless otherwise noted.
NOISE HISTOGRAM
PGA = 1
Data Rate = 2.5SPS
Buffer = Off
256 Readings
Output Code (LSB)
100
80
60
40
20
0
Percent of Population
−
5
−
4
−
3
−
2
−
10 1 2 3 4 5
NOISE HISTOGRAM
Output Code (LSB)
25
20
15
10
5
0
Percent of Population
−
20
−
18
−
16
−
14
−
12
−
10
−
8
−
6
−
4
−
2
0
2
4
6
8
10
12
14
16
18
20
Buffer = Off
256 Readings
PGA = 64
Data Rate = 2.5SPS
NOISE HISTOGRAM
Output Code (LSB)
25
20
15
10
5
0
Percent of Population
−
20
−
18
−
16
−
14
−
12
−
10
−
8
−
6
−
4
−
2
0
2
4
6
8
10
12
14
16
18
20
Buffer = Off
4096 Readings
PGA = 1
Data Rate = 1kSPS
NOISE HISTOGRAM
Output Code (LSB)
25
20
15
10
5
0
Percent of Population
−
150
−
135
−
120
−
105
−
90
−
75
−
60
−
45
−
30
−
15
0
15
30
45
60
75
90
105
120
135
150
Buffer = Off
4096 Readings
PGA = 64
Data Rate = 1kSPS
NOISE HISTOGRAM
Output Code (LSB)
25
20
15
10
5
0
Percent of Population
−
100
−
90
−
80
−
70
−
60
−
50
−
40
−
30
−
20
−
10
0
10
20
30
40
50
60
70
80
90
100
Buffer = Off
4096 Readings
PGA = 1
Data Rate = 30kSPS
NOISE HISTOGRAM
Output Code (LSB)
25
20
15
10
5
0
Percent of Population
−
600
−
540
−
480
−
420
−
360
−
300
−
240
−
180
−
120
−
60
0
60
120
180
240
300
360
420
480
540
600
Buffer = Off
4096 Readings
PGA = 64
Data Rate = 30kSPS