參數(shù)資料
型號: AK4648EC
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP/SPK-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 77/119頁
文件大小: 1272K
代理商: AK4648EC
[AK4648]
MS0625-E-01
2007/06
- 77 -
SPK-Amp Output (DAC Input = 0dBFS)
ALC bit = “0”
(LMTH1-0 bits = “00”; -2.5dBFS)
3.30Vpp
4.15Vpp
5.2Vpp (Note 64)
5.2Vpp (Note 64)
3.30Vpp
4.15Vpp
6.75Vpp
7.0Vpp (Note 64)
AVDD
HVDD
SPKG2-0 bits
ALC bit = “1”
000
001
010
011
000
001
010
011
3.11Vpp
3.92Vpp
5.2Vpp (Note 64)
5.2Vpp (Note 64)
3.11Vpp
3.92Vpp
6.37Vpp
7.0Vpp (Note 64)
3.6V
3.3V
4.5V
Note 64. The output level is calculated assuming that output signal is not clipped. In actual case, output signal may be
clipped when DAC outputs 0dBFS signal. DAC output level should be set to lower level by setting digital
volume so that Speaker-Amp output level is 5.2Vpp (HVDD=3.6V) or 7.0Vpp (HVDD=4.5V) or less and output
signal is not clipped.
Table 66. SPK-Amp Output Level
<ALC Operation Example of Speaker Playback>
fs=44.1kHz
Operation
2.5dBFS
Enable
11.6ms
Register Name
Comment
Data
00
0
10
LMTH1-0
ZELMN
ZTM1-0
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM2-0 bits should be the same data
as ZTM1-0 bits
Maximum gain at recovery operation
WTM2-0
011
23.2ms
REF7-0
IVL7-0,
IVR7-0
LMAT1-0
RGAIN1-0
ALC
C1H
+18dB
Gain of IVOL
91H
0dB
Limiter ATT step
Recovery GAIN step
ALC enable
Table 67. ALC Opeation Example of Speaker Playback
00
00
1
1 step
1 step
Enable
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