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參數(shù)資料
| 型號： | UPD63210L |
| 廠商： | NEC Corp. |
| 英文描述： | 16-BIT D/A CONVERTER WITH BUILT-IN DIGITAL FILTER FOR AUDIO |
| 中文描述： | 16位D /一個內(nèi)置轉(zhuǎn)換器，在數(shù)字的音頻過濾器 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 141K |
| 代理商： | UPD63210L |
μ
PD63210, 63210L
11
3.4 Digital De-emphasis Function
The IIR digital filter performs de-emphasis operations. The filter can cope with three types of sampling
frequencies (32/44.1/48 KHz) by using the DEFS1 (No.10) and DEFS2 (No.11) pins.
Table 3-4. Selection of De-emphasis Filter
3.5 Soft Mute Function
The soft mute function can be realized by control of the SMUTE (No.13) pin.
When applying the mute, set the value to SMUTE = H. By this, the output level of the D/A converter is
attenuated from 0dB to negative infinity (-
∞
) in 128 steps. The time required for a complete mute is 1024/fs.
When cancelling the mute, set the value to SMUTE = L. By this, the output level of the D/A converter is
increased from negative infinity (-
∞
) to 0dB in 128 steps. Figure 3-8 shows the relationship between the control
of the SMUTE pin and the output level of the D/A converter.
When initializing by resetting the system, the mute is cancelled and the output level of the D/A converter
reaches the maximum (0dB).
Don’t input the narrower “H” pulse than 8/fs to pin 13, or analog output signal may become unstable. In this
case, the unstable condition may be kept until system reset or power off.
Figure 3-8. Operation of Soft Mute Function
De-emphasis
OFF
32 kHz
44.1 kHz
48 kHz
DEFS1
L
H
L
H
DEFS2
L
H
H
L
H
L
0 dB
-
∞
1024/fs
SMUTE
D/A converter
output level
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