參數(shù)資料
型號： AK4671
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： Stereo CODEC with MIC/RCV/HP-AMP
中文描述： 立體聲編解碼器麥克風(fēng)/垃圾車/惠普腺苷
文件頁數(shù)： 50/164頁
文件大?。?/td> 1792K
代理商： AK4671
[AK4671]
MS0666-E-00
2007/10
- 50 -
■
EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)
The AK4671 becomes EXT Master Mode by setting PMPLL bit = “0” and M/S bit = “1”. Master clock is input from the
MCKI pin, the internal PLL circuit is not operated. The clock required to operate is MCKI (256fs, 384fs, 512fs, 768fs or
1024fs). The input frequency of MCKI is selected by FS2-0 bits (
Table 13
).
Mode
FS3 bit
FS2 bit
FS1 bit
FS0 bit
MCKI Input
Frequency
256fs
1024fs
384fs
768fs
512fs
256fs
N/A
(x: Don’t care, N/A: Not available)
Sampling Frequency
Range
8kHz
～
48kHz
8kHz
～
13kHz
8kHz
～
48kHz
8kHz
～
26kHz
8kHz
～
26kHz
8kHz
～
48kHz
N/A
0
1
4
5
6
7
x
x
x
x
x
x
0
0
1
1
1
1
0
0
0
0
1
1
0
1
0
1
0
1
(default)
Others
Others
Table 13. MCKI Frequency at EXT Master Mode (PMPLL bit = “0”, M/S bit = “1”)
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 reduced 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, 384fs
512fs, 768fs
1024fs
Table 14. Relationship between MCKI and S/N of LOUT1/ROUT1 pins
MCKI should always be present whenever the ADC or DAC is in operation (PMADL bit = “1”, PMADR bit = “1”,
PMDAL bit = “1” or PMDAR bit = “1”). If MCKI is not provided, the AK4671 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=PMDAL=PMDAR bits = “0”).
AK4671
DSP or
μ
P
MCKI
BICK
LRCK
SDTO
SDTI
BCLK
LRCK
SDTI
SDTO
MCKO
1fs
32fs or 64fs
MCLK
256fs, 384fs, 512fs,
768fs or 1024fs
Figure 44. 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
AK4671EG Stereo CODEC with MIC/RCV/HP-AMP
AK4673 Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4673EG Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4682 Multi-channel CODEC with 2Vrms Stereo Selector
AK4682EQ Multi-channel CODEC with 2Vrms Stereo Selector
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4671_10 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP-AMP
AK4671EG 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP-AMP
AK4673 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4673EG 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP and Touch Screen Controller
AK4675 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/RCV/HP/SPK-AMP
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