參數(shù)資料
型號： AK4642EN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： Stereo CODEC with MIC/HP/SPK-AMP
中文描述： 立體聲編解碼器麥克風/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù)： 29/83頁
文件大?。?/td> 670K
代理商： AK4642EN
ASAHI KASEI
[AK4642EN]
MS0420-E-00
2005/09
- 29 -
System Reset
Upon power-up, the AK4642 should be reset by bringing the PDN pin = “L”. This ensures that all internal registers reset
to their initial values.
The ADC enters an initialization cycle that starts when the PMADL or PMADR bit is changed from “0” to “1” at PMDAC
bits is “0”. The initialization cycle time is 1059/fs=24ms@fs=44.1kHz. During the initialization cycle, the ADC digital
data outputs of both channels are forced to a 2's compliment, “0”. The ADC output reflects the analog input signal after
the initialization cycle is complete. When PMDAC bit is “1”, the ADC does not require an initialization cycle.
The DAC enters an initialization cycle that starts when the PMDAC bit is changed from “0” to “1” at PMADL and
PMADR bits are “0”. The initialization cycle time is 1059/fs=24ms@fs=44.1kHz. During the initialization cycle, the
DAC input digital data of both channels are internally forced to a 2's compliment, “0”. The DAC output reflects the digital
input data after the initialization cycle is complete. When PMADC or PMADR bit is “1”, the DAC does not require an
initialization cycle.
Audio Interface Format
Three types of data formats are available and are selected by setting the DIF1-0 bits (seeTable 13). In all modes, the serial
data is MSB first, 2’s complement format. Audio interface formats can be used in both master and slave modes. LRCK
and BICK are output from the AK4642 in master mode, but must be input to the AK4642 in slave mode. The SDTO is
clocked out on the falling edge (“
↓
”) of BICK and the SDTI is latched on the rising edge (“
↑
”).
Mode
DIF1 bit
DIF0 bit
SDTO (ADC)
0
0
0
N/A
1
0
1
MSB justified
2
1
0
MSB justified
3
1
1
I
2
S compatible
Table 13. Audio Interface Format
If 16-bit data that ADC outputs is converted to 8-bit data by removing LSB 8-bit, “
1” at 16bit data is converted to “
1”
at 8-bit data. And when the DAC playbacks this 8-bit data, “
1” at 8-bit data will be converted to “
256” at 16-bit data
and this is a large offset. This offset can be removed by adding the offset of “128” to 16-bit data before converting to 8-bit
data.
LRCK
SDTI (DAC)
N/A
LSB justified
MSB justified
I
2
S compatible
BICK
N/A
≥
32fs
≥
32fs
≥
32fs
Figure
-
Figure 17
Figure 18 Default
Figure 19
BICK(32fs)
SDTO(o)
SDTI(i)
0
15 14
15 14
1
10
13
13
2 3
7
7 6 5 4 3 2
1 0
6 5 4 3
1 0
2
9
11 12 13 14 15 0
1 2 3
15 14 13
1
0
15
15
7 6
5 4 3 2
1 0
10
9
11 12 13 14 15
BICK(64fs)
0 1
16
2 3
17 18
31 0
1 2 3
1
0
16 17 18
31
SDTO(o)
SDTI(i)
15 14 13
Don't Care
1 0
1
15
15
2
1 0
15
0
15 14
15
14
Don't Care
15:MSB, 0:LSB
Lch Data
Rch Data
15 14 13
7 6 5 4 3
1 0
2
15 14 13
1 0
Figure 17. Mode 1 Timing
相關PDF資料
PDF描述
AK4643EN Stereo CODEC with MIC/HP/RCV/SPK-AMP
AK4645EZ Stereo CODEC with MIC/HP-AMP
AK4645 Stereo CODEC with MIC/HP-AMP
AK4646EZ Stereo CODEC with MIC/SPK-AMP
AK4646 Stereo CODEC with MIC/SPK-AMP
相關代理商/技術參數(shù)
參數(shù)描述
AK4642VN 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ???￡ Stereo CODEC with MIC/HP/SPK-AMP
AK4643 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with built-in MIC/HP/RCV/SPK amplifier
AK4643EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/RCV/SPK-AMP
AK4644 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with built-in MIC/HP/RCV amplifier
AK4644EN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/RCV-AMP
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