參數資料
型號: AK4343
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: Stereo DAC with HP/RCV/SPK-AMP
中文描述: 立體聲DAC惠普/垃圾車/胰腎聯合移植腺苷
文件頁數: 61/98頁
文件大?。?/td> 851K
代理商: AK4343
ASAHI KASEI
[AK4343]
MS0478-E-01
2006/10
- 61 -
<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 or
longer data as ZTM1-0 bits
Maximum gain at recovery operation
WTM2-0
11
23.2ms
REF7-0
AVL7-0,
AVR7-0
LMAT1-0
RGAIN1-0
ALC
C1H
+18dB
Gain of AVOL
91H
0dB
Limiter ATT step
Recovery GAIN step
ALC enable
Table 55. ALC Operation Example of Speaker Playback
00
00
1
1 step
1 step
Enable
<Caution for using Piezo Speaker>
When a piezo speaker is used, resistances more than 10
should be inserted between SPP/SPN pins and speaker in series,
respectively, as shown in Figure 58. Zener diodes should be inserted between speaker and GND as shown in Figure 58, in
order to protect SPK-Amp of AK4343 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 58)
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 58. Speaker Output Circuit (Load Capacitance > 30pF)
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