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SLES100 − DECEMBER 2003
ANALOG FIR FILTER PERFORMANCE IN DSD MODE
GAIN
vs
GAIN
vs
FREQUENCY
FREQUENCY
0
−1
−2
−3
−4
−5
−6
0
−10
−20
−30
−40
−50
−60
f
= 185 kHz
c
(1)
Gain = −6.6 dB
0
50
100
150
200
0
500
1000
1500
f − Frequency − kHz
f − Frequency − kHz
Figure 45. DSD Filter-1, Low BW
Figure 46. DSD Filter-1, High BW
GAIN
vs
GAIN
vs
FREQUENCY
FREQUENCY
0
−1
−2
−3
−4
−5
−6
0
−10
−20
−30
−40
−50
−60
f
= 90 kHz
c
(1)
Gain = 0.3 dB
0
50
100
150
200
0
500
1000
1500
f − Frequency − kHz
f − Frequency − kHz
Figure 47. DSD Filter-2, Low BW
Figure 48. DSD Filter-2, High BW
(1)
This gain is in comparison to PCM 0 dB, when the DSD input signal efficiency is 50%.
All specifications at DBCK = 2.8224 MHz (44.1 kHz × 64 f ), and 50% modulation DSD data input, unless otherwise noted.
S
43
BB [ BURR-BROWN CORPORATION ]
