LTC2420I LINER [Linear Technology], LTC2420I Datasheet - Page 9

• Manufacturer Part Number: LTC2420I
• Description: 20-Bit uPower No Latency ADC in SO-8
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
As shown in Figure 8, the LTC2420 can capture transient
data with 90dB of dynamic range (with a 300mV
signal at 2Hz). The exceptional DC performance of the
LTC2420 enables signals to be digitized independent of a
–0.05
–0.10
–0.15
–0.20
9a. Digitized Waveform with 2V DC Offset
0.20
0.15
0.10
0.05
0.00
–0.05
–0.10
–0.15
–0.20
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
0.20
0.15
0.10
0.05
9c. Digitized Waveform with No Offset
0
V
V
IN
IN
= 300mV
= 300mV
8a. Digitized Waveform
500ms
U
P-P
P-P
+ 0V DC
+ 2V DC
Figure 9. Using the LTC2420’s High Accuracy Wide Dynamic Range to Digitize
a 300mV
U
TIME
TIME
TIME
P-P
W
15Hz Waveform with a Large DC Offset (V
f
IN
2420 F09c
2420 F09a
2420 F08a
= 2Hz
Figure 8. Transient Signal Acquisiton
U
P-P
input
large DC offset. Figures 9a and 9b show the dynamic
performance with a 15Hz signal superimposed on a 2V DC
level. The same signal with no DC level is shown in Figures
9c and 9d.
–100
–120
–100
–120
–20
–40
–60
–80
–100
–120
CC
–20
–40
–80
–60
–20
–40
–60
–80
0
9b. FFT Waveform with 2V DC Offset
0
0
= 5V, V
9d. FFT Waveform with No Offset
REF
8b. Output FFT
FREQUENCY (Hz)
= 5V)
FREQUENCY (Hz)
FREQUENCY (Hz)
2Hz
100sps
0V OFFSET
15Hz
100sps
2V OFFSET
15Hz
100sps
0V OFFSET
2420 F08b
2420 F09b
2420 F09d
LTC2420
9