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