參數(shù)資料
型號: AK4538VN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 16Bit DS CODEC with MIC/HP/SPK-AMP
中文描述: 16位副編解碼器麥克風/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 26/70頁
文件大?。?/td> 485K
代理商: AK4538VN
ASAHI KASEI
[AK4538]
MS0198-E-01
2003/5
- 26 -
n
MIC Gain Amplifier
AK4538 has a Gain Amplifier for Microphone input. This gain is 0dB or +20dB, selected by the MGAIN bit. The typical
input impedance is 30k
.
MGAIN bit
Input Gain
0
1
+20dB
Table 16. Input Gain
n
MIC Power
The MPI and MPE pins supply power for the Microphone. These output voltages are 0.75 x AVDD (typ) and the maximum
output current is 1.25mA. MPWRI/MPWRE bit can control output from MPI and MPE pin.
MPE
Default
0dB
INT
EXT
MPI
“DTMIC” bit
MDT
0.075 x AVDD
“MPWRE” bit
“MPWRI” bit
500k
Figure 20. Microphone Power Supply
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MIC Detection Function
The AK4538 includes the detection function of microphone.
Example of the detection of external microphone.
(1) MPWRE= “1”.
(2) MPE drives external microphone.
(3) DTMIC bit is set by Table 17.
Input Level of DTM
0.075 x AVDD
< 0.050 x AVDD
DTMIC
1
0
External microphone
Connect
Disconnect
Table 17. Microphone detection result
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