CS5571

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DS768A5

6/25/07

14:12

introduce distortion components unless there is an appropriate amount of dither present. DITHER in the

CS5571 can be set to ON for AC signal measurement or for averaging DC signals. DITHER can be set to

OFF for improved resolution when performing a single conversion on a DC signal.

3.10 Digital Filter Characteristics

The digital filter is designed for fast settling, therefore it exhibits very little in-band attenuation. The filter

attenuation is 1.040 dB at 50 kHz when sampling at 100 kSps.

Figure 12. CS5571 Spectral Response (DC to fs/2)

Figure 13. CS5571 Spectral Response (DC to 10 kHz)

Figure 14. CS5571 Spectral Response (DC to 4fs)

-1.50

-1.25

-1.00

-0.75

-0.50

-0.25

0.00

0

10k

20k

30k

40k

50k

Frequency (Hz)

-0.0414 dB

-0.1660 dB

-0.3740 dB

-0.6660 dB

-1.040 dB

fs = 100 kSps

-0.05

-0.04

-0.03

-0.02

-0.01

0.00

0

2k4k

6k8k

10k

Frequency (Hz)

-0.001650 dB

-0.00700 dB

-0.01490 dB

-0.02643 dB

-0.04140 dB

fs = 100 kSps

-120

-100

-80

-60

-40

-20

0

0

100k

200k

300k

400k

Frequency (Hz)

fs = 100 kSps