AK4641 Datasheet, PDF (28/51 Pages) Asahi Kasei Microsystems – 16 BIT CODEC WITH BLUETOOTH INTERFACE

ASAHI KASEI
[AK4641]
„ 5 Band Equalizer
The AK4641 has 5 Band Equalizer before DAC of Stereo CODEC as shown in Figure 25.
The center frequencies and cut/boost amount are the followings.
• Center frequency: 100Hz, 250Hz, 1kHz, 3.5kHz, 10kHz (Note 25, Note 26)
• Cut/Boost amount: Minimum –10.5dB, Maximum +12dB, Step 1.5dB
Note 25: These are the frequencies when the sampling frequency is 44.1kHz. These frequencies are proportional to the
sampling frequency.
Note 26: 100Hz is not center frequency but the frequency component lower than 100Hz is controlled.
Note 27: 10kHz is not center frequency but the frequency component higher than 10kHz is controlled.
EQ5 bit controls ON/OFF of this Equalizer and these Boost amount are set by EQx3-0 bit as shown in Table 14.
EQA3-0: Select the boost level of 100Hz
EQB3-0: Select the boost level of 250Hz
EQC3-0: Select the boost level of 1kHz
EQD3-0: Select the boost level of 3.5kHz
EQE3-0: Select the boost level of 10kHz
EQx3-0
Boost amount
0H
+12.0dB
1H
+10.5dB
2H
+9.0dB
3H
+7.5dB
:
:
8H
0dB
Default
:
:
DH
−7.5dB
EH
−9.0dB
FH
−10.5dB
Table 14. Boost amount of 5 Band Equalizer
MS0301-E-00
- 28 -
2004/05