參數(shù)資料
型號: AK4705
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 2ch 24bit DAC with AV SCART Switch
中文描述: 2通道24位DAC,具有影音SCART開關(guān)
文件頁數(shù): 25/50頁
文件大?。?/td> 660K
代理商: AK4705
[AK4705]
MS0451-E-01
2007/06
- 25 -
Volume Control #1 (Main Volume)
The AK4705 has main volume control (Volume #1) as shown in Table 11.
(02H: D5-D0)
L5
L4
1
0
1
0
1
0
0
1
0
0
0
0
Note: The output must not exceed 3Vrms.
L3
0
0
0
1
0
0
L2
0
0
0
1
0
0
L1
1
0
0
1
0
0
L0
0
1
0
1
1
0
Gain
+6dB
+4dB
+2dB
0dB
-60dB
Mute
(default)
Table 11. Volume #1
When the MOD bit = “1”(default), changing levels don’t have pop noise. MDT1-0 bits select the transition time (Table
12). When the new gain value 1EH(-2dB) is written to gain resistor while the actual (stable) gain is 1FH(0dB), the gain
changes to 1EH(-2dB) within the transition time selected by MDT1-0 bits. The AK4705 compares the actual gain to the
value of gain register after finishing the transition time, and re-changes the actual gain to new resister value within the
transition time if the register value is different from the actual gain. When the MOD bit = “0”, there is no transition time
and the gain changes immediately. This change may cause a click noise.
[Gain=1EH]
[Gain=1DH]
Actual Gain
Gain Register
Transition Time (256/fs to 2048/fs. pop free.)
1FH
1EH
1DH
1EH
1FH
1DH
WR
WR
[Gain=1CH]
WR
1CH
1CH
compare
compare compare
(to 1EH)
(to 1DH)
(to 1CH)
Figure 7. Volume Change Operation (MOD bit = “1”)
MDT1
0
0
1
1
MDT0
0
1
0
1
Transition Time
256/fs
512/fs
1024/fs
2048/fs
(default)
Table 12. Volume Transition Time
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