AL Tech 8CH Instrukcja Użytkownika Pobierz pdf (Strona 18)

LTC2424/LTC2428

APPLICATIONS INFORMATION

WUU

Figure 12. Using the LTC2424/LTC2428’s High Accuracy Wide Dynamic Range

to Digitize a 300mV

P-P

15Hz Waveform with a Large DC Offset (V

= 5V, V

REF

= 5V)

1.5 2 2.50.501

TIME (SEC)

ADC OUTPUT (NORMALIZED TO VOLTS)

2.00

2.05

2.10

24248 F12a

1.95

1.90

1.80

1.85

2.20

2.15

= 300mV

P-P

+ 2V DC

25 500

FREQUENCY (Hz)

MAGNITUDE (dB)

–60

–40

–20

24248 F12b

–80

–100

–120

15Hz

100sps

2V OFFSET

1.5 2 2.510.50

TIME (SEC)

ADC OUTPUT (NORMALIZED TO VOLTS)

0.00

0.05

0.10

24248 F12c

–0.05

–0.10

–0.20

–0.15

0.20

0.15

= 300mV

P-P

+ 0V DC

25 500

FREQUENCY (Hz)

MAGNITUDE (dB)

–60

–40

–20

24248 F12d

–80

–100

–120

15Hz

100sps

0V OFFSET

Figure 12b. FFT Waveform with 2V DC OffsetFigure 12a. Digitized Waveform with 2V DC Offset

Figure 12d. FFT Waveform with No OffsetFigure 12c. Digitized Waveform with No Offset

0.50 1 1.5 2 2.5

TIME (SEC)

ADC OUTPUT (NORMALIZED TO VOLTS)

0.05

0.10

24248 F11a

–0.05

–0.10

–0.20

–0.15

0.20

500ms

0.15

= 2Hz

MAGNITUDE (dB)

–60

–40

–20

–80

–100

–120

2Hz

100sps

0V OFFSET

24248 F11b

FREQUENCY (Hz)

25 500

Figure 11b. Output FFTFigure 11a. Digitized Waveform

Figure 11. Transient Signal Acquisition

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 35 36

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