Datasheet

ADS1255
ADS1256
SBAS288K JUNE 2003 REVISED SEPTEMBER 2013
www.ti.com
10
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.
EFFECTIVE NUMBER OF BITS
vs INPUT VOLTAGE
Input Voltage, V
IN
(V)
2.50 0.5 1.0 1.5 2.0 3.0 3.5 4.0 4.5 5.0
23
22
21
20
19
18
ENOB (rms)
Data Rate = 1kSPS
Data Rate = 30kSPS
PGA = 1
23
22
21
20
19
18
EFFECTIVE NUMBER OF BITS
vs TEMPERATURE
Temperature (
_
C)
ENOB (rms)
30
50
10 10 30 90 1107050
Data Rate = 1kSPS
Data Rate = 30kSPS
PGA = 1
0.0006
0.0004
0.0002
0
0.0002
0.0004
0.0006
INTEGRAL NONLINEARITY vs INPUT SIGNAL
Input Voltage, V
IN
(V)
INL (% of FSR)
4
3
5
2
1345210
40
_
C
PGA = 1
+25
_
C+85
_
C
+125
_
C
0.0009
0.0008
0.0007
0.0006
0.0005
0.0004
0.0003
0.0002
0.0001
0
INL
(% of FSR)
PGA Setting
2148 643216
INTEGRAL NONLINEARITY vs PGA
Buffer On
Buffer Off
50
45
40
35
30
25
20
15
10
5
0
ANALOG SUPPLY CURRENT vs TEMPERATURE
Temperature (
_
C)
Analog Current (mA)
30
50
10 10 30 90 1107050
PGA = 1, Buffer Off
PGA = 1, Buffer On
PGA = 64, Buffer Off
PGA = 64, Buffer On
40
35
30
25
20
15
10
5
0
ANALOG SUPPLY CURRENT vs PGA
PGA Setting
Analog Current (mA)
2148 643216
Buffer Off
Buffer On