www.ti.com
SBAS424C – JUNE 2009 – REVISED MARCH 2010
TYPICAL CHARACTERISTICS
At T
A
= +25°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = 3.3V, V
REF
= 2.5V, VREFN = AVSS, f
CLK
= 7.3728MHz, and
f
DATA
= 60SPS, unless otherwise noted.
NOISE DISTRIBUTION HISTOGRAM
200
180
160
140
Data Rate = 10SPS
Shorted Input
512 Samples
160
140
120
Data Rate = 60SPS
Shorted Input
512 Samples
NOISE DISTRIBUTION HISTOGRAM
Occurrences
Occurrences
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
120
100
80
60
40
20
0
100
80
60
40
20
0
Reading (
m
V)
Figure 2.
NOISE DISTRIBUTION HISTOGRAM
2800
2400
2000
Data Rate = 400SPS
Shorted Input
4096 Samples
1600
1400
1200
Occurrences
Occurrences
1000
800
600
400
200
0
1600
1200
800
400
0
25.0
22.5
20.0
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5
-15.0
-17.5
-20.0
-22.5
-25.0
Reading (
m
V)
Figure 4.
EFFECTIVE NUMBER OF BITS vs TEMPERATURE
25
Data Rate = 10SPS
24
23
Data Rate = 60SPS
22
21
20
Data Rate = 14.4kSPS
19
-55
-35
-15
5
25
45
65
85
105
125
Temperature (
°
C)
0
16
14
12
EFFECTIVE NUMBER OF BITS HISTOGRAM
Data Rate = 60SPS
30 Units
Occurrences
ENOB (rms)
10
8
6
4
2
22.1
23.1
22.3
22.2
22.5
23.2
23.3
22.0
22.8
22.4
22.7
22.9
23.0
Figure 6.
Figure 7.
Copyright © 2009–2010, Texas Instruments Incorporated
Product Folder Link(s):
22.6
ENOB (rms)
23.4
23.5
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
Reading (
m
V)
-5.0
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Reading (
m
V)
Figure 3.
NOISE DISTRIBUTION HISTOGRAM
Data Rate = 14.4kSPS
Shorted Input
4096 Samples
Figure 5.
7
TI [ TEXAS INSTRUMENTS ]
