Datasheet

LTC2485
29
2485fc
APPLICATIONS INFORMATION
Figure 29. Input Signal Using the Internal Oscillator Figure 30. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
Figure 31. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch Mode
Figure 32. Input Normal Mode Rejection at DC
Figure 33. Input Normal Mode Rejection at DC Figure 34. Input Normal Mode Rejection at f
s
= 256f
N
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
INPUT SIGNAL ATTENUATION (dB)
–3
–2
–1
0
4
2485 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
2485 F30
0.1
100
50Hz MODE
60Hz MODE
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0f
S
2f
S
3f
S
4f
S
5f
S
6f
S
7f
S
8f
S
9f
S
10f
S
11f
S
12f
S
INPUT NORMAL MODE REJECTION (dB)
2485 F31
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0f
S
INPUT NORMAL MODE REJECTION (dB)
2485 F32
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2f
S
3f
S
4f
S
5f
S
6f
S
7f
S
8f
S
9f
S
10f
S
INPUT SIGNAL FREQUENCY (Hz)
INPUT NORMAL MODE REJECTION (dB)
2485 F33
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
f
N
0 2f
N
3f
N
4f
N
5f
N
6f
N
7f
N
8f
N
f
N
= f
EOSC/5120
INPUT SIGNAL FREQUENCY (Hz)
250f
N
252f
N
254f
N
256f
N
258f
N
260f
N
262f
N
INPUT NORMAL MODE REJECTION (dB)
2485 F34
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120