CS5581

DS796PP1

21

3/25/08

14:34

Figures 11 through 16 illustrate the performance of the CS5581 when driven by a 5.55 kHz sine wave at

various amplitudes. In each case, the captured data was windowed with a seven-term window function

that exhibits 4.3 dB of attenuation before being processed by the FFT.

Figure 14 illustrates the converter performance with an input that is 1/10,000 of full scale. This is a signal

magnitude of about 6.5 codes, peak to peak.

Figure 15 illustrates the converter performance with an input that is 1/100,000 of full scale, or about 0.65

of a code, peak to peak. These plots illustrate that this converter has excellent small-signal performance

due to the near-perfect DNL of the converter.

-160

-140

-120

-100

-80

-60

-40

-20

0

0

20k

40k

60k

80k

100k

Frequency (Hz)

5.55 kHz, 0 dB

32k Samples @ 200 kSps

-160

-140

-120

-100

-80

-60

-40

-20

0

0

20k

40k

60k

80k

100k

Frequency (Hz)

5.55 kHz, -6 dB

32k Samples @ 200 kSps

-160

-140

-120

-100

-80

-60

-40

-20

0

0

20k

40k

60k

80k

100k

Frequency (Hz)

5.55 kHz, -80 dB

32k Samples @ 200 kSps

-160

-140

-120

-100

-80

-60

-40

-20

0

0

20k

40k

60k

80k

100k

Frequency (Hz)

5.55 kHz, -12 dB

32k Samples @ 200 kSps

-160

-140

-120

-100

-80

-60

-40

-20

0

0

20k

40k

60k

80k

100k

Frequency (Hz)

5.55 kHz, -100 dB

32k Samples @ 200 kSps

Figure 11. Spectral Performance, 0 dB

Figure 12. Spectral Performance, -6 dB

Figure 13. Spectral Performance, -12 dB

Figure 14. Spectral Performance, -80 dB

Figure 15. Spectral Performance, -100 dB