Datasheet

LTC2481
32
2481fc
APPLICATIONS INFORMATION
Figure 40. Input Normal Mode Rejection 2x Speed Mode Figure 41. Input Normal Mode Rejection 2x Speed Mode
Figure 42. Input Normal Mode Rejection vs Input
Frequency, 2x Speed Mode and 50Hz/60Hz Mode
Figure 43. Input Normal Mode Rejection 2x Speed Mode
Figure 44. Calibration Setup
INPUT SIGNAL FREQUENCY (f
N
)
INPUT NORMAL REJECTION (dB)
2481 F40
0
–20
–40
–60
–80
–100
–120
0
f
N
2f
N
3f
N
4f
N
5f
N
6f
N
7f
N
8f
N
INPUT SIGNAL FREQUENCY (f
N
)
INPUT NORMAL REJECTION (dB)
2481 F41
0
–20
–40
–60
–80
–100
–120
250248 252 254 256 258 260 262 264
INPUT FREQUENCY (Hz)
0
NORMAL MODE REJECTION (dB)
50
100
125 225
2481 F42
25 75
150
175
200
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
INCM
= 2.5V
V
IN(P-P)
= 5V
T
A
= 25°C
MEASURED DATA
CALCULATED DATA
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
48
–70
–80
–90
–100
–110
–120
–130
–140
54 58
2481 F43
50 52
56 60 62
NORMAL MODE REJECTION (dB)
NO AVERAGE
WITH
RUNNING
AVERAGE
SCL
SDA
CA1
CA0/f
0
6
7
9
10
V
CC
5V
LTC2481
REF
+
GND
IN
IN
+
1
ISOTHERMAL
2
C7
0.1µF
1.7k
C8
F
4
R2
2k
R7
8k
62
5
4
R8
1k
5
2481 F44
26.3C
TYPE K
THERMOCOUPLE
JACK
(OMEGA MPJ-K-F)
83
REF
IN OUT
G1
NC1M4V0
TRIM
GND
LT1236
+
1.7k