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參數(shù)資料
| 型號(hào)： | AK4646 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Stereo CODEC with MIC/SPK-AMP |
| 中文描述： | 立體聲編解碼器麥克風(fēng)/胰腎聯(lián)合移植腺苷 |
| 文件頁(yè)數(shù)： | 26/79頁(yè) |
| 文件大小： | 789K |
| 代理商： | AK4646 |
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[AK4646]
MS0557-E-02
2007/05
- 26 -
■
EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)
The AK4646 becomes EXT Master Mode by setting PMPLL bit = “0” and M/S bit = “1”. Master clock is input from
MCKI pin, the internal PLL circuit is not operated. The clock required to operate is MCKI (256fs, 512fs or 1024fs). The
input frequency of MCKI is selected by FS1-0 bits (Table 13).
Mode
FS3-2 bits
FS1 bit
FS0 bit
MCKI Input
Frequency
256fs
1024fs
256fs
512fs
Sampling Frequency
Range
7.35kHz
～
48kHz
7.35kHz
～
13kHz
7.35kHz
～
48kHz
7.35kHz
～
26kHz
0
1
2
3
Don’t care
Don’t care
Don’t care
Don’t care
Table 13. MCKI Frequency at EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)
0
0
1
1
0
1
0
1
(default)
The S/N of the DAC at low sampling frequencies is worse than at high sampling frequencies due to out-of-band noise.
The out-of-band noise can be improved by using higher frequency of the master clock. The S/N of the DAC output
through LOUT/ROUT pins at fs=8kHz is shown in Table 14.
MCKI
S/N
(fs=8kHz, 20kHzLPF + A-weighted)
83dB
93dB
93dB
256fs
512fs
1024fs
Table 14. Relationship between MCKI and S/N of LOUT/ROUT pins
MCKI should always be present whenever the ADC or DAC is in operation (PMADL bit = “1”, PMADR bit = “1” or
PMDAC bit = “1”). If MCKI is not provided, the AK4646 may draw excess current and it is not possible to operate
properly because utilizes dynamic refreshed logic internally. If MCKI is not present, the ADC and DAC should be in the
power-down mode (PMADL=PMADR=PMDAC bits = “0”).
AK4646
DSP or
μ
P
MCKI
BICK
LRCK
SDTO
SDTI
BCLK
LRCK
SDTI
SDTO
MCKO
1fs
32fs or 64fs
MCLK
256fs, 512fs or 1024fs
Figure 17. EXT Master Mode
BCKO bit
BICK Output
Frequency
32fs
64fs
0
1
(default)
Table 15. BICK Output Frequency at Master Mode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4646EN | Stereo CODEC with MIC/SPK-AMP |
| AK4647 | Stereo CODEC with MIC/HP-AMP |
| AK4647VN | Stereo CODEC with MIC/HP-AMP |
| AK4648 | Stereo CODEC with MIC/HP/SPK-AMP |
| AK4648EC | Stereo CODEC with MIC/HP/SPK-AMP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4646_11 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4646EN | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4646ENP-L | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述:STEREO CODEC+SPK |
| AK4646EZ | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/SPK-AMP |
| AK4647 | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP |
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