AK4642VN Datasheet, PDF (50/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
ʻεϐʔΧ࠶ੜ࣌ͷALCઃఆྫʼ
Register Name
LMTH
ZELMN
ZTM1-0
WTM1-0
REF7-0
IVL7-0,
IVR7-0
LMAT1-0
RGAIN1-0
ALC
Comment
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
fs=44.1kHz
Data
Operation
00
−2.5dBFS
0
Enable
10
11.6ms
11
23.2ms
C1H
+18dB
Gain of IVOL
91H
0dB
Limiter ATT step
00
Recovery GAIN step
00
ALC enable
1
Table 43. εϐʔΧ࠶ੜ࣌ͷALCઃఆྫ
1 step
1 step
Enable
ʻѹిεϐʔΧ࢖༻࣌ͷ஫ҙ఺ʼ
ෛՙ༰ྔ͕30pF Λ௒͑ΔѹిεϐʔΧΛ࢖༻࣌ ͸ɺFigure 33ʹࣔ͢Α͏ʹγϦʔζ఍߅(10ΩҎ্)ΛSPP pin,
SPN pinͱεϐʔΧͷؒʹૠೖ͍ͯͩ͘͠͞ɻ·ͨɺ֎෦͔Βѹྗ͕Ճ͑ΒΕͨͱ͖ѹిεϐʔΧ͕ྗిى
Λൃੜ͢ΔͷͰɺͦͷରࡦʹFigure 33ʹࣔ͢Α͏ʹεϐʔΧͱGNDؒʹπΣφʔμΠΦʔυΛૠೖͯͩ͘͠
͍͞ɻπΣφʔμΠΦʔυ͸ҎԼͷ৚݅Λຬͨ͢΋ͷΛ࢖༻͍ͯͩ͘͠͞ɻ
0.92x SVDD ≤ πΣφʔμΠΦʔυ(Figure 33ͷZD)ͷπΣφʔిѹ ≤ SVDD+0.3V
Ex) SVDD = 5.0Vͷ࣌: 4.6V ≤ ZD ≤ 5.3V
ྫ͑͹ɺπΣφʔిѹ5.1V(Min஋ 4.97V, Max஋ 5.24V)ͷπΣφʔμΠΦʔυ͕࢖༻ՄೳͰ͢ɻ
SPK-Amp
ZD
≥10Ω
SPP
SPN
≥10Ω
ZD
Figure 33. SPKग़ྗճ࿏(ѹిεϐʔΧͱ઀ଓ͢Δ৔߹)
MS0358-J-02
- 50 -
2005/04