AKD4645A-A Datasheet, PDF (21/53 Pages) Asahi Kasei Microsystems – Evaluation board Rev.1 for AK4645A

ASAHI KASEI
8. [Filter Dialog]
This dialog can easily set the AK4645A’s programmable filter.
[AKD4645A-A]
Figure 13 . [Filter] window
8-1. Value input columns on left side
[Sampling Rate]
[Cut Off Frequency of FIL1]
[Cut Off Frequency of FIL3]
[Pole Frequency of EQ]
[Zero Frequency of EQ]
[FIL3 GAIN]
[EQ GAIN]
Æ Input value of sampling frequency [unit : Hz] <default : 44100>
Æ Input value of cut off frequency of FIL1 [unit : Hz] <default : 150>
Æ Input value of cut off frequency of FIL3 [unit : Hz] <default : 4000>
Æ Input value of pole frequency of EQ [unit : Hz]
Æ Input value of zero frequency of EQ [unit : Hz]
Æ Input value of gain of FIL3 (0~−10dB) [unit : dB]
Æ Input value of gain of EQ (+12~0dB) [unit : dB]
8-2. Check box on left side
Check Box
FIL1
FIL3
EQ
LPF of FIL1
LPF of FIL3
Check
FIL1 bit =“1”
FIL3 bit =“1”
EQ bit =“1”
F1AS bit =“1”(LPF)
F3AS bit =“1”(LPF)
Check off
FIL1 bit =“0”
FIL3 bit =“0”
EQ bit =“0”
F1AS bit =“0”(HPF)
F3AS bit =“0”(HPF)
8-2. [Register Setting] panel and [Register Setting] button on right side
Click [Register setting] button, then filter coefficient set by 8-1 and 8-2 is written on [Register setting] panel.
(It is also written to the actual control register of the AK4645A.)
< KM094901>
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2009/10