9

LTC2420

APPLICATIO S I FOR ATIO

8a. Digitized Waveform

8b. Output FFT

Figure 8. Transient Signal Acquisiton

9a. Digitized Waveform with 2V DC Offset

9b. FFT Waveform with 2V DC Offset

As shown in Figure 8, the LTC2420 can capture transient

signal at 2Hz). The exceptional DC performance of the

LTC2420 enables signals to be digitized independent of a

TIME

0

0.05

0.10

2420 F08a

–0.05

–0.10

–0.20

–0.15

0.20

500ms

0.15

FREQUENCY (Hz)

–60

–40

–20

0

–80

–100

–120

2Hz

100sps

0V OFFSET

2420 F08b

TIME

2.00

2.05

2.10

2420 F09a

1.95

1.90

1.80

1.85

2.20

2.15

FREQUENCY (Hz)

–60

–40

–20

0

2420 F09b

–80

–100

–120

15Hz

100sps

2V OFFSET

TIME

0.00

0.05

0.10

2420 F09c

–0.05

–0.10

–0.20

–0.15

0.20

0.15

9c. Digitized Waveform with No Offset

Figure 9. Using the LTC2420’s High Accuracy Wide Dynamic Range to Digitize

9d. FFT Waveform with No Offset

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.

FREQUENCY (Hz)

–60

–40

–20

0

2420 F09d

–80

–100

–120

15Hz

100sps

0V OFFSET