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參數(shù)資料
| 型號： | AK4555VT |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | Low Power & Small Package 20bit ツヒ CODEC |
| 中文描述： | 低功耗 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 200K |
| 代理商： | AK4555VT |
ASAHI KASEI
[AK4555]
MS0363-E-01
2005/08
- 9 -
OPERATION OVERVIEW
System Clock Input
The AK4555 can be input MCLK=256fs, 384fs, 512fs, 768fs or 1024fs (fs is equal to or lower than 25kHz when MCLK
is 1024fs). The input clock applied to the MCLK pin as internal master clock is divided into 256fs automatically. When
MCLK is 1024fs, oversampling rate of D/A converter is automatically changed from 128fs to 256fs. The relationship
between the external clock applied to the MCLK input and the desired sample rate is defined in Table 1. The LRCK clock
input should be synchronized with MCLK.
The phase between these clocks does not matter. *fs is sampling frequency.
When the synchronization is out of phase by changing the clock frequencies during normal operation, the AK4555 may
occur click noise. In case of DAC, click noise is avoided by setting the inputs to “0”.
All external clocks(MCLK, SCLK and LRCK) must be present unless PWADN=PWDAN= “L”. If these clocks are not
provided, the AK4555 may draw excess current and may not possibly operate properly because the device utilizes
dynamic refreshed logic internally.
fs
MCLK
256fs
384fs
512fs
8.0kHz
2.0480MHz
3.0720MHz
4.0960MHz
16.0kHz
4.0960MHz
6.1440MHz
8.1920MHz
32.0kHz
8.1920MHz
12.2880MHz
16.3840MHz
44.1kHz
16.9344MHz
22.5792MHz
48.0kHz
12.2880MHz
18.4320MHz
24.5760MHz
Table 1. System Clock Example
For low sampling rates, outband noise causes S/N of DAC to degrade. S/N is improved by setting MCLK to 1024fs. Table
2 shows S/N of DAC output.
fs
MCLK
8kHz
～
50kHz
256fs/384fs/512fs/768fs
8kHz
～
25kHz
1024fs
Table 2. Relationship among fs, MCLK frequency and S/N of DAC
SCLK
768fs
1024fs
8.1920MHz
16.3840MHz
N/A
N/A
N/A
32fs
64fs
6.1440MHz
12.2880MHz
24.5760MHz
33.8688MHz
36.8640MHz
0.2560MHz
0.5120MHz
1.0240MHz
1.4112MHz
1.5360MHz
0.512MHz
1.024MHz
2.048MHz
2.822MHz
3.072MHz
S/N(fs=8kHz, A-weighted)
84dB
90dB
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AK4555VTP-E2 | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: |
| AK4556 | 制造商:AKM 制造商全稱:AKM 功能描述:3V 192kHz 24Bit ツヒ CODEC |
| AK4556VT | 制造商:AKM 制造商全稱:AKM 功能描述:3V 192kHz 24Bit ツヒ CODEC |
| AK4556VTP-E2 | 功能描述:IC STEREO CODEC 24BIT 20TSSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:PCM 數(shù)據(jù)接口:PCM 音頻接口 分辨率（位）:15 b ADC / DAC 數(shù)量:1 / 1 三角積分調變:是 S/N 比，標準 ADC / DAC (db):- 動態(tài)范圍，標準 ADC / DAC (db):- 電壓 - 電源，模擬:2.7 V ~ 3.3 V 電壓 - 電源，數(shù)字:2.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-VFBGA 供應商設備封裝:80-BGA MICROSTAR JUNIOR（5x5） 包裝:帶卷 (TR) 其它名稱:296-21257-2 |
| AK4558EN | 功能描述:Audio Interface 32 b Serial 28-QFN (5x5) 制造商:akm semiconductor inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:音頻 數(shù)據(jù)接口:串行 分辨率（位）:32 b ADC/DAC 數(shù):1 / 1 三角積分:是 信噪比，ADC/DAC（db）（典型值）:92 / 100 動態(tài)范圍，ADC/DAC（db）（典型值）:108 / 108 電壓 - 電源，模擬:2.4 V ~ 3.6 V 電壓 - 電源，數(shù)字:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:28-WFQFN 裸露焊盤 供應商器件封裝:28-QFN（5x5） 標準包裝:1 |
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