LTC2492 Linear Technology, LTC2492 Datasheet - Page 33

• Manufacturer Part Number: LTC2492
• Description: 24-Bit 2-/4-Channel ADC
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
–1500
–2500
–3500
–1000
–2000
–3000
–500
–100
–110
–120
–130
–140
Figure 29. Input Normal Mode Rejection
2x Speed Mode with and Without Running
Averaging
–10
–70
–80
–90
Figure 32.–FS Error vs Output Data Rate
and Temperature
20
–5
15
10
0
5
0
Figure 35. Offset Error vs Output Data
Rate and Reference Voltage
48
0
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
V
V
F
T
V
V
F
O
A
O
IN(CM)
IN
IN(CM)
CC
10
10
= EXT CLOCK
= 25°C
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= 0V
50
= V
20 30
20 30
V
REF
= V
= 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
= 25°C
= 5V
RUNNING
AVERAGE
WITH
80
80
60
90 100
90 100
2492 F32
2492 F35
2492 F29
62
Figure 33. Resolution (Noise
vs Output Data Rate and Temperature
–10
Figure 36. Resolution (Noise
vs Output Data Rate and Reference
Voltage
50
40
30
20
10
24
22
20
18
16
14
10
12
24
22
20
18
16
14
12
10
0
Figure 30. Offset Error vs Output Data
Rate and Temperature
0
0
0
V
V
V
F
V
V
F
T
RES = LOG 2 (V
V
V
V
V
F
RES = LOG 2 (V
O
O
A
IN(CM)
CC
IN
IN(CM)
IN
O
CC
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
= 0V
= V
= 0V
= 5V, V
= V
T
A
20
20 30
20 30
REF
= V
= 85°C
REF
= V
= V
REF(CM)
REF(CM)
= 5V
30
REF
REF(CM)
= 5V
T
= 2.5V
REF
T
REF
40
A
40
40
A
= 85°C
= 25°C
/NOISE
/NOISE
50
50
50
T
V
A
60
60
CC
60
RMS
RMS
= 25°C
= V
)
70
70
)
70
REF
RMS
RMS
80
80
80
= 5V
≤ 1LSB)
90
90 100
90 100
≤ 1LSB)
2492 F30
2492 F33
2492 F36
100
3500
3000
2500
2000
1500
1000
500
22
20
18
16
14
10
22
20
18
16
14
10
12
12
vs Output Data Rate and Reference
Voltage
Figure 37. Resolution (INL
Figure 34. Resolution (INL
vs Output Data Rate and Temperature
0
Figure 31. +FS Error vs Output Data
Rate and Temperature
0
0
0
V
V
REF
F
T
RES = LOG 2 (V
V
V
F
RES = LOG 2 (V
V
V
F
V
O
O
A
O
IN(CM)
CC
IN(CM)
IN
CC
IN(CM)
CC
10
10
10
= EXT CLOCK
= 25°C
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= 0V
–
= V
= 5V, V
= V
T
= GND
20 30
A
20 30
20 30
REF
REF
= V
= V
= V
= 85°C
REF(CM)
REF(CM)
REF(CM)
= 5V
REF
= 5V
REF
REF
= 2.5V
T
40
40
40
A
/INL
/INL
= 85°C
LTC2492
50
50
50
MAX
MAX
T
V
60
60
A
60
CC
)
)
= 25°C
= V
70
70
70
T
MAX
A
MAX
REF
= 25°C
80
80
80
33
= 5V
≤ 1LSB)
≤ 1LSB)
90 100
90 100
90 100
2492 F31
2492 F37
2492 F34
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