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參數(shù)資料
| 型號(hào)： | LC78857V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Digital Audio D/A Converter IC with On-Chip Digital Filters |
| 中文描述： | 數(shù)字音頻D / A轉(zhuǎn)換器IC與在片上數(shù)字濾波器 |
| 文件頁(yè)數(shù)： | 7/11頁(yè) |
| 文件大小： | 199K |
| 代理商： | LC78857V |
Attenuator data
The signal can be attenuated by inputting attenuation data (A2 to A9).
The attenuation specified by the attenuation data is given by the following formula:
Note: The attenuation is 0 dB when the data value is 7F (hexadecimal).
However, if A9 (the MSB) is 1, the A2 to A data is ignored and the prior attenuation setting is retained.
If the attenuation level is changed from 0 dB to –
∞
dB, the IC performs a soft muting operation. The soft muting time is
1/Fs
×
1024. Also, the time required to change the attenuation follows the slope of the soft muting function.
If new attenuation data is input while the attenuation is changing, the attenuation level starts to change from the current
level to the newly specified level at that point.
Note: If the IC is initialized when the MODE pin is low, the IC is initialized with serial data values of A0 = A1 = A9 =
low, and A2 to A8 = high.
However, the LAT/ND must be held high during this initialization.
When MODE is high: parallel input mode
In this mode, the speed (normal/double), deemphasis, and soft muting settings are specified with the LAT/ND,
SH/EMP, and DAT/MT pins. It is not possible to set the attenuation data in this mode.
· Normal speed/double speed setting
· Deemphasis setting
The deemphasis function supports operation at fs = 44.1 kHz.
· Soft muting setting
The LC78857V uses the digital attenuator to implement a
soft muting function. If the input level applied to the
DAT/MT pin is changed from low to high, the
attenuation changes from 0 dB to –
∞
dB. Inversely, if the
DAT/MT pin is changed from high to low, the
attenuation changes from –
∞
dB to 0 dB.
The time required for the change is 1/fs
×
1024.
No. 5537-7/11
LC78857V
Attenuation data
———————— (dB)
128
20 log
Attenuation data
MSB
LSB
Attenuation level (dB)
A9
A8
A7
A6
A5
A4
A3
A2
0
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
–0.137
0
0
0
0
0
0
0
1
–42.14
–
∞
0
0
0
0
0
0
0
0
LAT/ND
Normal/double speed
L
Normal speed
H
Double speed
DAT/MT
Soft muting
L
Off
H
On
SH/EMP
Deemphasis
L
Off
H
On
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| LC7886M | 18-Bit A/D Converter for Digital Audio Applications |
相關(guān)代理商/技術(shù)參數(shù) |
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| LC78858V | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述: |
| LC7886 | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:18-Bit A/D Converter for Digital Audio Applications |
| LC78865 | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:16-bit A/D Converter |
| LC78865M | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:16-bit A/D Converter |
| LC78866V | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:16-bit A/D Converter |
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