ltc2493 Linear Technology Corporation, ltc2493 Datasheet - Page 29

• Manufacturer Part Number: ltc2493
• Description: 24-bit 2-/4-channel Delta Sigma Adc With Easy Drive Input Current Cancellation And I2c Interface
• Manufacturer: Linear Technology Corporation

applicaTions inForMaTion
–1000
–1500
–2000
–2500
–3500
–3000
–100
–110
–120
–130
–140
–500
–10
–70
–80
–90
20
15
10
–5
0
5
0
48
0
Figure 28. Input Normal Mode
Rejection 2x Speed Mode with and
Without Running Averaging
Figure 31.–FS Error vs Output Data
Rate and Temperature
Figure 34. Offset Error vs Output
Data Rate and Temperature
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
V
V
F
T
V
V
F
O
IN(CM)
IN
A
O
IN(CM)
CC
10
10
= EXT CLOCK
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
= 0V
50
= V
20 30
20 30
V
= V
REF
= V
CC
52
REF(CM)
REF(CM)
= 5V
= 5V, V
T
A
40
40
54
= 85°C
REF
V
50
CC
50
NO AVERAGE
= 2.5V
56
= V
60
60
REF
T
A
58
70
70
= 5V
RUNNING
AVERAGE
= 25°C
WITH
80
80
60
90 100
90 100
2493 F28
2493 F34
2493 F31
62
–10
24
22
18
14
10
24
22
20
18
16
14
10
50
40
30
20
10
20
16
12
12
0
Figure 29. Offset Error vs Output Data
Rate and Temperature
0
0
0
Figure 32. Resolution (Noise
vs Output Data Rate and Temperature
Figure 35. Resolution (Noise
vs Output Data Rate and Temperature
V
V
F
T
RES = LOG 2 (V
V
V
V
V
F
V
V
V
F
RES = LOG 2 (V
O
A
IN(CM)
IN
O
CC
IN(CM)
CC
IN
O
IN(CM)
CC
IN
10
10
10
= EXT CLOCK
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
= 0V
= 0V
= 0V
= 5V, V
= V
= V
T
A
20 30
20 30
20
REF
= V
= 85°C
REF
= V
= V
REF(CM)
REF
REF(CM)
= 5V
30
REF(CM)
= 5V
= 2.5V
REF
T
T
REF
40
40
A
40
A
= 85°C
/NOISE
= 25°C
/NOISE
50
50
50
T
V
A
CC
60
60
RMS
60
RMS
= 25°C
= V
)
70
70
70
)
REF
80
80
80
= 5V
RMS
RMS
90 100
90
90 100
2493 F35
2493 F32
2493 F29
100
≤ 1LSB)
≤ 1LSB)
3500
3000
2000
1000
2500
1500
500
22
14
10
22
20
18
16
14
12
10
20
18
16
12
0
0
Figure 33. Resolution (INL
vs Output Data Rate and Temperature
0
Figure 36. Resolution (INL
vs Output Data Rate and Temperature
0
Figure 30. +FS Error vs Output Data
Rate and Temperature
V
V
F
RES = LOG 2 (V
V
V
REF
F
T
RES = LOG 2 (V
V
V
V
F
O
O
A
IN(CM)
CC
IN(CM)
IN
O
CC
IN(CM)
CC
10
10
10
= EXT CLOCK
= EXT CLOCK
= 25°C
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
= 0V
–
= V
= 5V, V
= V
T
= GND
A
20 30
20 30
20 30
REF
REF
= V
= V
= 85°C
= V
REF(CM)
REF(CM)
= 5V
REF
REF(CM)
= 5V
REF
= 2.5V
REF
40
T
40
40
A
/INL
/INL
= 85°C
50
50
50
MAX
MAX
LTC2493
T
V
A
60
60
60
CC
)
)
= 25°C
= V
70
70
70
T
A
REF
= 25°C
80
MAX
80
MAX
80
= 5V

90 100
90 100
90 100
≤ 1LSB)
≤ 1LSB)
2493 F30
2493 F33
2493 F36
2493fa