參數(shù)資料
型號: AK4642EN
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): 50/83頁
文件大小: 670K
代理商: AK4642EN
ASAHI KASEI
[AK4642EN]
MS0420-E-00
2005/09
- 50 -
<ALC Operation Example of Speaker Playback>
fs=44.1kHz
Operation
2.5dBFS
Enable
11.6ms
Register Name
Comment
Data
00
0
10
LMTH
ZELMN
ZTM1-0
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM1-0 bits should be the same data
as ZTM1-0 bits
Maximum gain at recovery operation
WTM1-0
11
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 43. ALC Operation Example of Speaker Playback
00
00
1
1 step
1 step
Enable
<Caution for using Piezo Speaker>
When a piezo speaker (load capacitance > 30pF) is used, resistances more than 10
should be inserted between SPP/SPN
pins and speaker in series, respectively, as shown in Figure 33. Zener diodes should be inserted between speaker and
GND as shown in Figure 33, in order to protect SPK-Amp of AK4642 from the power that the piezo speaker outputs when
the speaker is pressured. Zener diodes of the following zener voltage should be used.
0.92 x HVDD
Zener voltage of zener diodo (ZD in Figure 33)
HVDD+0.3V
Ex) In case of HVDD = 5.0V: 4.6V
ZD
5.3V
For example, zener diode which zener voltage is 5.1V(Min: 4.97V, Max: 5.24V) can be used.
SPP
SPK-Amp
SPN
10
10
ZD
ZD
Figure 33. Speaker Output Circuit (Load Capacitance > 30pF)
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