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參數(shù)資料
| 型號： | SM5877 |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | 3rd-order , 2-channel D/A Converter |
| 中文描述： | 第三階，2通道D / A轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 140K |
| 代理商： | SM5877 |
SM5877AM
NIPPON PRECISION CIRCUITS—14
Deemphasis Filter (DEEM)
The built-in digital deemphasis filter is designed to
operate at 44.1 kHz. Deemphasis is ON when DEEM
is HIGH, and OFF when DEEM is LOW.
Attenuation (MDT, MCK, MLEN)
The digital attenuation mode is selected when
MODE is LOW. The attenuator operates by multi-
plying the internal 6-bit up/down counter’s output
data with the signal data.
The direction of the 6-bit up/down counter is con-
trolled by the level on MUTE (down when MUTE is
HIGH, and up when MUTE is LOW). The count is
advanced on the rising edge of ATCK.
When the count reaches 0 (down) or 63 (up), the
counter automatically stops.
The gain is set by the counter contents DATT as fol-
lows.
Upon system initialization or when MODE changes
state, DATT is set to 63, which corresponds to the
maximum gain of 0 dB as shown in table 2.
Gain
20
63
DATT
log
×
[dB]
=
Soft Mute (SMUTE)
Table 2. Attenuator gain
DATT
Gain (dB)
DATT
Gain (dB)
DATT
Gain (dB)
DATT
Gain (dB)
63
0.0
47
2.545
31
6.160
15
12.465
62
0.139
46
2.732
30
6.444
14
13.064
61
0.280
45
2.923
29
6.739
13
13.708
60
0.424
44
3.118
28
7.044
12
14.403
59
0.570
43
3.317
27
7.360
11
15.159
58
0.718
42
3.522
26
7.687
10
15.987
57
0.869
41
3.731
25
8.028
9
16.902
56
1.023
40
3.946
24
8.383
8
17.925
55
1.180
39
4.166
23
8.752
7
19.085
54
1.339
38
4.391
22
9.138
6
20.424
53
1.501
37
4.623
21
9.542
5
22.007
52
1.667
36
4.861
20
9.966
4
23.946
51
1.835
35
5.105
19
10.412
3
26.444
50
2.007
34
5.357
18
10.881
2
29.966
49
2.183
33
5.617
17
11.378
1
35.987
48
2.362
32
5.884
16
11.904
0
∞
Soft mute mode is selected when MODE is HIGH.
The up/down counter is switched to internal clock
drive, and soft mute operation is controlled by
MUTE only.
When MUTE goes HIGH, the up/down counter
counts down. The total time to go from 0 to maxi-
mum mute is 1024/fs. This corresponds to approxi-
mately 23.2 ms at fs = 44.1 kHz.
When MUTE is LOW, soft mute is released. The
attenuation counter output counts up, increasing the
gain. The time taken to return to 0 dB is also 1024/fs.
Soft mute operation is shown in figure 2.
Upon system initialization or when MODE changes
state, mute is released, which corresponds to the
maximum gain of 0 dB.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SM5877AM | 3rd-order , 2-channel D/A Converter |
| SM5878 | 3rd-order , 2-channel D/A converter |
| SM5878AM | 3rd-order , 2-channel D/A converter |
| SM5878AV | 3rd-order , 2-channel D/A converter |
| SM5879 | 3rd-order , 2-channel D/A Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SM5877AM | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3rd-order , 2-channel D/A Converter |
| SM5878 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3rd-order , 2-channel D/A converter |
| SM5878AM | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3rd-order , 2-channel D/A converter |
| SM5878AV | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3rd-order , 2-channel D/A converter |
| SM5879 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:3rd-order , 2-channel D/A Converter |
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