ltc2484 Linear Technology Corporation, ltc2484 Datasheet - Page 32

• Manufacturer Part Number: ltc2484
• Description: 24-bit Delta Sigma Adc With Easy Drive Input Current Cancellation
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
LTC2484
32
–10
Figure 23. Resolution (Noise
vs Output Data Rate and Temperature
24
18
14
10
22
20
18
16
14
10
20
15
10
–5
22
20
16
12
12
Figure 24. Resolution (INL
vs Output Data Rate and Temperature
0
5
0
0
0
Figure 25. Offset Error vs Output
Data Rate and Reference Voltage
V
V
F
RES = LOG 2 (V
V
V
F
T
V
V
V
F
RES = LOG 2 (V
O
O
IN(CM)
IN
A
IN(CM)
CC
O
IN(CM)
CC
IN
10
10
10
= EXT CLOCK
= EXT CLOCK
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
= 0V
= V
= 0V
T
= V
T
A
A
20 30
20 30
20 30
REF
V
U
= V
= 85°C
REF
= V
= 85°C
= V
CC
REF(CM)
REF(CM)
= 5V
REF(CM)
= 5V
= 5V, V
REF
REF
40
40
40
U
/INL
REF
V
/NOISE
50
50
50
CC
MAX
= 2.5V
= V
T
T
A
A
60
60
60
RMS
= 25°C
= 25°C
)
REF
70
70
70
)
= 5V
W
MAX
RMS
80
80
80
≤ 1LSB)
90 100
90 100
90 100
≤ 1LSB)
2484 F25
2484 F23
2484 F24
U
temperature. In certain circumstances, a reduction of the
differential reference voltage may be beneficial.
Input Bandwidth
The combined effect of the internal SINC
of the analog and digital autocalibration circuits deter-
mines the LTC2484 input bandwidth. When the internal
oscillator is used with the notch set at 60Hz, the 3dB input
bandwidth is 3.63Hz. When the internal oscillator is used
with the notch set at 50Hz, the 3dB input bandwidth is
3.02Hz. If an external conversion clock generator of fre-
quency f
bandwidth is 11.8 • 10
EOSC
Figure 26. Resolution (Noise
vs Output Data Rate and Reference Voltage
24
18
14
10
22
20
14
10
22
20
16
12
18
16
12
Figure 27. Resolution (INL
Output Data Rate and Reference Voltage
0
0
V
V
F
T
RES = LOG 2 (V
V
V
REF
F
T
RES = LOG 2 (V
V
V
is connected to the F
O
A
O
A
IN(CM)
IN
IN(CM)
IN
CC
CC
10
10
= EXT CLOCK
= 25°C
= EXT CLOCK
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= 0V
= 0V
–
= 5V, V
= 5V, V
= GND
20 30
20 30
= V
= V
REF(CM)
REF(CM)
REF
REF
–6
REF
= 2.5V
= 2.5V
REF
40
40
• f
/NOISE
/INL
50
50
EOSC
MAX
V
V
CC
60
60
RMS
CC
)
= V
.
= V
)
70
70
REF
RMS
MAX
REF
O
80
80
= 5V
= 5V
≤ 1LSB) vs
pin, the 3dB input
≤ 1LSB)
90 100
90 100
2484 F26
2484 F27
4
digital filter and
2484fa