Datasheet
LTC2481
28
2481fc
APPLICATIONS INFORMATION
Figure 24. Resolution
(Noise
RMS
≤ 1LSB) vs Output
Data Rate and Temperature
Figure 25. Resolution
(INL
MAX
≤ 1LSB) vs Output
Data Rate and Temperature
Figure 26. Offset Error vs Output
Data Rate and Reference Voltage
Figure 27. Resolution (Noise
RMS
≤ 1LSB)
vs Output Data Rate and Reference Voltage
Figure 28. Resolution (INL
MAX
≤ 1LSB)
vs Output Data Rate and Reference Voltage
OUTPUT DATA RATE (READINGS/SEC)
0
10
RESOLUTION (BITS)
12
16
18
20
24
10
50
70
2481 F24
14
22
40
90
100
20
30
60 80
V
IN(CM)
= V
REF(CM)
V
CC
= V
REF
= 5V
V
IN
= 0V
CA0/f
0
= EXT CLOCK
RES = LOG 2 (V
REF
/NOISE
RMS
)
T
A
= 85°C
T
A
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
0
10
RESOLUTION (BITS)
12
16
18
22
10
50
70
2481 F25
14
20
40
90
100
20
30
60 80
T
A
= 85°C
T
A
= 25°C
V
IN(CM)
= V
REF(CM)
V
CC
= V
REF
= 5V
CA0/f
0
= EXT CLOCK
RES = LOG 2 (V
REF
/INL
MAX
)
OUTPUT DATA RATE (READINGS/SEC)
0
–10
OFFSET ERROR (ppm OF V
REF
)
–5
5
10
20
10
50
70
2481 F26
0
15
40
90
100
20
30
60 80
V
CC
= 5V, V
REF
= 2.5V
V
CC
= V
REF
= 5V
V
IN(CM)
= V
REF(CM)
V
IN
= 0V
CA0/f
0
= EXT CLOCK
T
A
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
0
10
RESOLUTION (BITS)
12
16
18
20
24
10
50
70
2481 F27
14
22
40
90
100
20
30
60 80
V
IN(CM)
= V
REF(CM)
V
IN
= 0V
CA0/f
0
= EXT CLOCK
T
A
= 25°C
RES = LOG 2 (V
REF
/NOISE
RMS
)
V
CC
= 5V, V
REF
= 2.5V
V
CC
= V
REF
= 5V
OUTPUT DATA RATE (READINGS/SEC)
0
10
RESOLUTION (BITS)
12
16
18
22
10
50
70
2481 F28
14
20
40
90
100
20
30
60 80
V
IN(CM)
= V
REF(CM)
V
IN
= 0V
CA0/f
0
= EXT CLOCK
T
A
= 25°C
RES = LOG 2 (V
REF
/INL
MAX
)
V
CC
= 5V, V
REF
= 2.5V
V
CC
= V
REF
= 5V
Figure 29. Input Signal Using
the Internal Oscillator
Figure 30. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
INPUT SIGNAL ATTENUATION (dB)
–3
–2
–1
0
4
2481 F29
–4
–5
–6
1
2
3
5
50Hz MODE 60Hz MODE
50Hz AND
60Hz MODE
INPUT NOISE SOURCE SINGLE POLE
EQUIVALENT BANDWIDTH (Hz)
1
INPUT REFERRED NOISE
EQUIVALENT BANDWIDTH (Hz)
10
0.1 1 10 100 1k 10k 100k 1M
2481 F30
0.1
100
50Hz MODE
60Hz MODE