Datasheet

28
LTC2420
33a. Digitized Waveform
33b. Output FFT
Figure 33. Transient Signal Acquisiton
34a. Digitized Waveform with 2V DC Offset 34b. FFT Waveform with 2V DC Offset
34c. Digitized Waveform with No Offset
Figure 34. Using the LTC2420’s High Accuracy Wide Dynamic Range to Digitize
a 300mV
P-P
15Hz Waveform with a Large DC Offset (V
CC
= 5V, V
REF
= 5V)
34d. FFT Waveform with No Offset
APPLICATIO S I FOR ATIO
WUU
U
TIME
ADC OUTPUT (NORMALIZED TO VOLTS)
0
0.05
0.10
–0.05
–0.10
–0.20
–0.15
0.20
500ms
0.15
f
IN
= 2Hz
2420 F33a
FREQUENCY (Hz)
MAGNITUDE (dB)
–60
–40
–20
0
–80
–100
–120
2Hz
100sps
0V OFFSET
2420 F33b
TIME
ADC OUTPUT (NORMALIZED TO VOLTS)
2.00
2.05
2.10
2420 F34a
1.95
1.90
1.80
1.85
2.20
2.15
V
IN
= 300mV
P-P
+ 2V DC
FREQUENCY (Hz)
MAGNITUDE (dB)
–60
–40
–20
0
2420 F34b
–80
–100
–120
15Hz
100sps
2V OFFSET
TIME
ADC OUTPUT (NORMALIZED TO VOLTS)
0.00
0.05
0.10
2420 F34c
–0.05
–0.10
–0.20
–0.15
0.20
0.15
V
IN
= 300mV
P-P
+ 0V DC
FREQUENCY (Hz)
MAGNITUDE (dB)
–60
–40
–20
0
2420 F34d
–80
–100
–120
15Hz
100sps
0V OFFSET