參數資料
型號: AK4683
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Asynchronous Multi-Channel Audio CODEC with DIR/T
中文描述: 異步多聲道音頻編解碼器署長/噸
文件頁數: 39/82頁
文件大?。?/td> 1257K
代理商: AK4683
ASAHI KASEI
[AK4683]
MS0427-E-01
2005/11
- 39 -
Input Selector, Input Attenuator
The AK4683 includes 6ch stereo input selectors (Figure 21). The input selector is 6 to 1 selector. The AIN2-0 bits set
the input channel (Table 39).
AIN2 bit
AIN1 bit
AIN0 bit
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Input Selector
LIN1 / RIN1
LIN2 / RIN2
LIN3 / RIN3
LIN4 / RIN4
LIN5 / RIN5
LIN5 / RIN5
None
None
0
1
0
1
0
1
0
1
Default
Table 39. Input Selector
The input ATTs are constructed by adding the input resistor (Ri) for LIN1-6/RIN1-6 pins and the feedback resistor (Rf)
between LOPIN (ROPIN) pin and LOUT (ROUT) pin (Figure 21). The voltage range of the LISEL(RISEL) pin should
be less than typ. 0.62 x AVDD1 (Vpp). If the input voltage of the input selector exceeds typ. 0.62 x AVDD, the input
voltage of the LISEL(RISEL) pins must be attenuated to typ. 0.62 x AVDD1 (Vpp) by the input ATTs. The Table 40
shows the example of Ri and Rf.
LIN 1
LIN 2
LIN 3
LIN 4
LIN 5
R IN 1
R IN 2
R IN 3
R IN 4
R IN 5
R O P IN
R IS E L
LO P IN
LIS E L
P re-A m p
P re-A m p
T o A D C
T o A D C
R i
R i
R i
R i
R i
R i
R i
R i
R i
R i
R f
R f
R IN 6
LIN 6
R i
R i
Figure 21. Input ATT
Input Range
Ri [k
]
Rf [k
]
ATT Gain [dB]
LISEL/R pin
1.02Vrms
(2.88Vpp)
1.02Vrms
(2.88Vpp)
1Vrms
(2.82Vpp)
4Vrms
47
12
11.86
2Vrms
47
24
5.84
1Vrms
47
47
0
Note: Input range of internal ADC is 0.62 x AVDD1 (5V) = 3.1Vpp typ.
Table 40. Input ATT example
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