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AK7755EN データシート(PDF) 31 Page - Asahi Kasei Microsystems

部品番号 AK7755EN
部品情報  DSP with Mono ADC Stereo CODEC Mic/Lineout Amp
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メーカー  AKM [Asahi Kasei Microsystems]
ホームページ  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK7755EN データシート(HTML) 31 Page - Asahi Kasei Microsystems

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[AK7755]
014006643-E-00
2014/10
- 31 -
CONT00: Clock Setting 1, Analog Input Setting
Write during clock reset.
W
R
Name
D7
D6
D5
D4
D3
D2
D1
D0
Default
C0h
40h
CONT00
0
CKM[2]
CKM[1]
CKM[0]
AINE
DFS[2]
DFS[1]
DFS[0]
00h
D6, D5, D4: CKM[2:0]
Clock Mode Setting
CKM
mode
CKM
[2:0]
Master
Slave
Main Clock
fs
System Clock
0
000
Master
XTI=12.288MHz fixed
fs=8~96kHz
XTI
(default)
1
001
Master
XTI=18.432MHz fixed
fs=8~96kHz
XTI
2
010
Slave
XTI=12.288MHz fixed
fs=8~96kHz
XTI, BICK, LRCK
3
011
Slave
BICK
fs=8~96kHz
BICK, LRCK
5
101
Slave
BICK
fs=16kHz
BICK,
LRCK(fs=8kHz)
TDM256 bit (CONT02: D7) = “1” cannot be used in CKM mode5.
D3: AINE Analog Input Setting (IN1/INP1, IN2/INN1, IN3/INP2, IN4/INN2 pin)
0: Not Using Analog Input (default)
1: Using Analog Input
Set AINE bit to “1” first before other control register settings when using the IN1/INP1, IN2/INN1,
IN3/INP2 and IN4/INN2 pins as analog inputs. The AK7755 starts charging to a capacitor connected
to each pin by this setting.
Set AINE bit to “0” when using digital microphones (DMIC1 or DMIC2 bit (CONT1E: D7, D4)=
“1”).
D2, D1, D0: DFS[2:0]
Sampling Frequency
DFS mode
DFS[2:0]
fs
0
000
8kHz
(default)
1
001
12kHz
2
010
16kHz
3
011
24kHz
4
100
32kHz
5
101
48kHz
6
110
96kHz
7
111
N/A
Multiply 44.1/48 to calculate the values for multiple sampling frequencies of 44.1kHz.
Write “0” into the “0” registers.


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