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參數(shù)資料
| 型號： | SM5866AS |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | D/A Converter for DSD and PCM |
| 中文描述： | D / A轉(zhuǎn)換為渠務署以及PCM |
| 文件頁數(shù)： | 15/23頁 |
| 文件大小： | 586K |
| 代理商： | SM5866AS |
SM5866AS
NIPPON PRECISION CIRCUITS INC.—15
PCM Mode Theoretical Quantization Noise
During PCM operation (D-Mode), residual quantization noise in the audio signal band to the high-frequency
band, caused by the operation of the 3rd-order 23-level quantizer noise shaper, is greatly reduced. Figure 6
shows the theoretical quantization noise component for 16fs to 96fs operation.
PCM Mode Oversampling Operation
The SM5866AS receives signal output from either a 8-times or 4-times oversampling digital
fi
lter. Internally,
this data is further oversampled up to the noise shaper operating rate. The internal oversampling ratio is deter-
mined automatically by the system clock frequency and the input sampling frequency. This internal oversam-
pling ratio must be an integer, and therefore must satisfy the conditions shown in table 2.
Figure 6. Quantization noise level
Table 2. Internal oversampling conditions
f
WCKI
and f
CKI
conditions
1
1. f
WCKI
= word clock frequency, f
CKI
= input system clock frequency, n = internal oversampling ratio
where n = 1, 2, 3, ...
Noise shaper operating frequency
0.5
1
1.5
2
2.5
3
3.5
4
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
Frequency (fs)
Q
16fs
24fs
32fs
48fs
64fs
96fs
0 dB sine wave equivalent white noise level
16-bit, fs quantization noise level
20-bit, fs quantization noise level
24-bit, fs quantization noise level
f
CKI
f
WCKI
8
×
n
×
=
f
ns
f
WCKI
n
f
8
----------
=
×
=
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