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參數(shù)資料
| 型號： | AK4665AEN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 20-Bit Stereo CODEC with MIC/HP-AMP |
| 中文描述： | 20位立體聲編解碼器麥克風(fēng)/惠普腺苷 |
| 文件頁數(shù)： | 14/52頁 |
| 文件大?。?/td> | 541K |
| 代理商： | AK4665AEN |
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ASAHI KASEI
[AK4665A]
MS0440-E-01
2006/05
- 14 -
For low sampling rates, outband noise causes S/N to degrade. S/N is improved by setting DFS bit to “1”. Table 3 shows
S/N of DAC output for both HP-Amp and Stereo-Lineout. When DFS bit is “1”, MCLK needs 512fs.
S/N (fs=8kHz, BW=20kHz, A-weighted)
DFS
fs
MCLK
Default
HP-amp
84dB
90dB
Lineout
84dB
88dB
0
1
8kHz
～
48kHz
8kHz
～
24kHz
Table 3. Relationship among fs, MCLK frequency and S/N of HP-amp and Lineout
256fs/512fs
512fs
Serial Data Interface
The AK4665A interfaces with external systems via the BICK, LRCK, SDTO and SDTI pins. Four data formats are
available and are selected by setting DIF1-0 bits (Table 4). Mode 0 of SDTI is compatible with existing 16bit DAC and
digital filters. Mode 1 of SDTI is a 20bit version of Mode 0. Mode 2 of SDTI is similar to AKM ADCs and many DSP
serial ports. Mode 3 is compatible with the I
2
S serial data protocol. In SDTI Modes 2 and 3, the following formats are also
valid: 16-bit data followed by four zeros and 18-bit data followed by two zeros. In all modes, the serial data is MSB first
and 2’s complement format.
Mode
DIF1
DIF0
SDTO
0
0
0
20bit, MSB justified
16bit, LSB justified
1
0
1
20bit, MSB justified
20bit, LSB justified
2
1
0
20bit, MSB justified
20bit, MSB justified
3
1
1
IIS (I
2
S)
IIS (I
2
S)
Table 4. Audio Data Format
LRCK
SDTI
BICK
≥
32fs
≥
40fs
≥
40fs
≥
40fs
LRCK
H/L
H/L
H/L
L/H
Default
BICK(64fs)
SDTO(o)
0
1
2
16
17
18
20
21
31
0
1
2
31
0
19
1
18
0
19
18
19
SDTI(i)
1
14
0
15
12
11
1
0
Lch Data
Rch Data
Don’t Care
Don’t Care
4
3
2
1
13
16
17
18
14
15
1
13
20
21
12 11
4
3
2
0
BICK(32fs)
SDTI(i)
0
1
2
8
9
10
15
0
1
2
0
15
1
14
7
8
12
11
14
6
5
4
13
3
2
1
0
8
9
10
15
7
8
12
11
14
6
5
4
13
3
2
1
0
15
14
15
SDTO(o)
19 18
11
12
10
9
8
7
6
5
4
19
19
18
11
12
10
9
8
7
6
5
4
19
19
Figure 8. Mode 0 Timing
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| AK4666VQ | 功能描述:IC CODEC STEREO 20BIT LQFP 制造商:akm semiconductor inc. 系列:* 零件狀態(tài):上次購買時間 標(biāo)準(zhǔn)包裝:1,000 |
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| 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 |
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