LTC2481
28
2481fc
APPLICATIONS INFORMATION
Figure 24. Resolution
(NoiseRMS ≤ 1LSB) vs Output
Data Rate and Temperature
Figure 25. Resolution
(INLMAX ≤ 1LSB) vs Output
Data Rate and Temperature
Figure 26. Offset Error vs Output
Data Rate and Reference Voltage
Figure 27. Resolution (NoiseRMS ≤ 1LSB)
vs Output Data Rate and Reference Voltage
Figure 28. Resolution (INLMAX ≤ 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
VIN(CM) = VREF(CM)
VCC = VREF = 5V
VIN = 0V
CA0/f0 = EXT CLOCK
RES = LOG 2 (VREF/NOISERMS)
TA = 85°C
TA = 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
TA = 85°C
TA = 25°C
VIN(CM) = VREF(CM)
VCC = VREF = 5V
CA0/f0 = EXT CLOCK
RES = LOG 2 (VREF/INLMAX)
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
VCC = 5V, VREF = 2.5V
VCC = VREF = 5V
VIN(CM) = VREF(CM)
VIN = 0V
CA0/f0 = EXT CLOCK
TA = 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
VIN(CM) = VREF(CM)
VIN = 0V
CA0/f0 = EXT CLOCK
TA = 25°C
RES = LOG 2 (VREF/NOISERMS)
VCC = 5V, VREF = 2.5V
VCC = VREF = 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
VIN(CM) = VREF(CM)
VIN = 0V
CA0/f0 = EXT CLOCK
TA = 25°C
RES = LOG 2 (VREF/INLMAX)
VCC = 5V, VREF = 2.5V
VCC = VREF = 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