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參數(shù)資料
| 型號： | AK4620A |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 24 BIT 192KHZ AUDIO CODEC WITH IPGA |
| 中文描述： | 24位192kHz的音頻編解碼器單親遺傳算法 |
| 文件頁數(shù)： | 23/42頁 |
| 文件大?。?/td> | 395K |
| 代理商： | AK4620A |
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ASAHI KASEI
[AK4620A]
MS0368-E-00
2004/12
- 23 -
Input Volume
The AK4620A includes two channel-independent analog volumes (IPGA), each with 32 levels in 0.5dB increments.
These are located in front of the ADC while digital volume controls (IATT) with 128 levels (including MUTE) are
located after the ADC. Control of both of these volume settings is handled by the same register address. When the MSB of
the register is “1”, the IPGA changes and when the MSB = “0” the IATT changes.
The IPGA is an analog volume control that improves the S/N ratio compared with digital volume controls (Table 11).
Level changes only occur during zero-crossings to minimize switching noise. Channel independent zero-crossing
detection is used. If there are no zero-crossings, then the level will change after a time-out. The time-out period scales
with fs. The periods of 256/fs, 512/fs, 1024/fs and 2048/fs are selected by ZTM1-0 bits in normal speed mode. If a new
value is written to the IPGA register before the IPGA changes at the zero crossing or time-out, the previous value
becomes invalid. The timer (channel independent) for time-out is reset and the timer restarts for the new IPGA value.
ZCEI bits in the control register enable zero-crossing detection.
The IATT is a log volume that is linear-interpolated internally. When changing the level, the transition between ATT
values has 29 levels and is done by soft changes, eliminating any switching noise.
Input Gain Setting
+6dB
108dB
0dB
110dB
+18dB
101dB
fs=44.1kHz, A-weight
Table 11. IPGA+ADC S/N (typ.)
ZTM0
Normal speed
0
256/fs
1
512/fs
0
1024/fs
1
2048/fs
Table 12. LRCK cycles for timeout period
ZTM1
0
0
1
1
Double speed
512/fs
1024/fs
2048/fs
4096/fs
Quad speed
1024/fs
2048/fs
4096/fs
8192/fs
Default
Output Volume
The AK4620A includes channel independent digital output volumes (ATT) with 256 levels at linear steps including
MUTE. These volumes are in front of the DAC and can attenuate the input data from 0dB to
48dB and mute. When
changing levels, transitions are executed via soft changes, eliminating any switching noise. The transition time of 1 level
and all 256 levels is shown in Table 13.
Transition Time
1 Level
4LRCK
8LRCK
16LRCK
Table 13. ATT Transition Time
Sampling Speed
255 to 0
1020LRCK
2040LRCK
4080LRCK
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AK4620AVF | 24 BIT 192KHZ AUDIO CODEC WITH IPGA |
| AK4620B | 24-Bit 192kHz Audio CODEC with IPGA |
| AK4620BVF | 24-Bit 192kHz Audio CODEC with IPGA |
| AK4626A | High Performance Multi-channel Audio CODEC |
| AK4626AVQ | High Performance Multi-channel Audio CODEC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AK4620AVF | 制造商:AKM 制造商全稱:AKM 功能描述:24 BIT 192KHZ AUDIO CODEC WITH IPGA |
| AK4620AVFP-E2 | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: |
| AK4620B | 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 192kHz Audio CODEC with IPGA |
| AK4620BVF | 制造商:AKM 制造商全稱:AKM 功能描述:24-Bit 192kHz Audio CODEC with IPGA |
| AK4620BVFPE2 | 制造商:Asahi Kasei Microsystems Co Ltd 功能描述: |
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