參數(shù)資料
型號: AK4371
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: DAC with built-in PLL & HP-AMP
中文描述: DAC,帶有內(nèi)置的鎖相環(huán)
文件頁數(shù): 37/62頁
文件大小: 842K
代理商: AK4371
[AK4371]
MS0596-E-00
2007/04
- 37 -
Mono Hands-free Output (MOUT pin)
The common voltage is 0.475 x AVDD. The load resistance is 600
Ω
(min). When the PMMO bit is “1”, the mono
Hands-free output is powered-up. DALM, DARM, LIN1M, RIN1M, LIN2M, RIN2M, LIN3M and RIN3M bits control
each path switch. When MOG bit = “0”(R
DM
=100k) and ATTM3-0 bits = “0FH”(0dB), the mixing gain is
6dB(typ) for
all paths. When MOG bit = “1”(R
DM
=50k) and ATTM3-0 bits = “0FH”(0dB), the mixing gain of output signal is 0dB.
When LDIF=LDIFM=LIN1L=RIN1R bits = “1”, LIN1 and RIN1 pins become IN
and IN+ pins respectively. IN
and
IN+ pins can be used as full-differential mono line input for analog mixing of MOUT pin. In this case, LIN1M and
RIN1M bits should be “0”.
If the path is OFF and the signal is input to the input pin, the input pin should be biased to a voltage equivalent to VCOM
voltage (= 0.475 x AVDD) externally. Figure 46 shows the external bias circuit example.
Figure 27
LDIFM bit
+
MOUT pin
RIN3 pin
R
M
R
DM
100k(typ)
RIN3M bit
DALM bit
DARM bit
Figure 28. Summation circuit for Mono Hands-free output
+
50k(typ)
R
M
DAC Rch
R
DM
RIN2 pin
LIN3 pin
100k(typ)
100k(typ)
RIN2M bit
LIN3M bit
LIN2 pin
100k(typ)
LIN2M bit
DAC Lch
RIN1 pin
100k(typ)
RIN1M bit
LIN1 pin
100k(typ)
LIN1M bit
100k(typ)
Mono Hands-free Output (MOUT pin) Volume
MOUT volume is controlled by ATTM3-0 bit when MMUTE bit = “0” (+6dB
24dB or 0dB
30dB, 2dB step, Table
27). Pop noise occurs when ATTM3-0 bits are changed.
MOG bit = “1”
(DAC Only)
FH
+6dB
EH
+4dB
DH
+2dB
CH
0dB
:
:
1H
22dB
0H
24dB
1
x
MUTE
Table 27. MOUT Volume ATT values (x: Don’t care)
MMUTE
ATTM3-0
MOG bit = “0”
0dB
2dB
4dB
6dB
:
:
28dB
30dB
MUTE
(default)
:
:
0
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