LTC2485 LINER [Linear Technology], LTC2485 Datasheet - Page 29

• Manufacturer Part Number: LTC2485
• Description: 24-Bit ?? ADC with Easy Drive Input Current Cancellation and I2C Interface
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
Figure 29. Input Signal Using the Internal Oscillator
Figure 33. Input Normal Mode Rejection at DC
Figure 31. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch Mode
–100
–110
–120
–100
–110
–120
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
–5
–1
–2
–3
–4
–6
0
0
0
0
0 f
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
U
S
f
N
2f
INPUT SIGNAL FREQUENCY (Hz)
S
1
2f
3f
N
S
U
4f
50Hz MODE
3f
S
N
5f
2
S
4f
6f
N
S
7f
W
5f
3
S
N
8f
f
N
50Hz AND
60Hz MODE
S
6f
= f
9f
60Hz MODE
N
S
EOSC/5120
10f
4
7f
S
11f
N
2485 F33
2485 F31
2485 F29
S
12f
U
8f
5
N
S
Figure 34. Input Normal Mode Rejection at f
Figure 30. Input Refered Noise Equivalent Bandwidth
of an Input Connected White Noise Source
Figure 32. Input Normal Mode Rejection at DC
–100
–110
–120
–100
–110
–120
–10
–20
–30
–40
–50
–60
–70
–80
–90
100
0.1
10
–10
–20
–30
–40
–50
–60
–70
–80
–90
1
0
250f
0.1
0
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
N
INPUT NOISE SOURCE SINGLE POLE
f
252f
S
1
INPUT SIGNAL FREQUENCY (Hz)
EQUIVALENT BANDWIDTH (Hz)
2f
N
S
10
254f
3f
S
N
100
4f
60Hz MODE
50Hz MODE
S
256f
5f
S
N
1k
6f
258f
S
10k 100k
7f
N
S
260f
8f
LTC2485
S
N
2485 F30
2485 F34
9f
2485 F32
S
262f
s
1M
10f
= 256f
N
S
29
N
2485fa