WM8756

Advance Information

AI Rev 1.3 October 2001

34

DSD MODE CHARACTERISTICS

The following filter responses show the DAC output frequency response in SACD or DSD mode, with and without an external 3

rd

order Lowpass filter. Table 15 gives details of the attenuation versus frequency of the two cases.

-0.25

-0.2

-0.15

-0.1

-0.05

0

0.05

0

5000

10000

15000

20000

25000

Frequency (Hz)

Chip output

Output and 3rd order Butterworth filter

Figure 26 DSD Mode Frequency Response – to 25kHz

-10

-8

-6

-4

-2

0

0

10000

20000

30000

40000

50000

60000

Frequency (Hz)

Chip output

Output and 3rd order Butterworth filter

Figure 27 DSD Mode Frequency Response – to 60kHz

-50

-40

-30

-20

-10

0

10

0

20000

40000

60000

80000

100000

120000

Frequency (Hz)

Chip output

Output and 3rd order Butterworth filter

Figure 28 DSD Mode Frequency Response - to 120kHz

-140

-120

-100

-80

-60

-40

-20

0

20

0

200000

400000

600000

800000

1e+06

Frequency (Hz)

Chip output

Output and 3rd order Butterworth filter

Figure 29 DSD Mode Frequency Response – to 1MHz