AK4951AEN Datasheet, PDF (48/105 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4951A]
Note 37. [Translation the filter coefficient calculated by the equations above from real number to binary
code (2’s complement)]
X = (Real number of filter coefficient calculated by the equations above) x 2¹³
X should be rounded to integer, and then should be translated to binary code (2’s complement).
MSB of each filter coefficient setting register is sine bit.
IN
OUT
EQ2
EQC2 bit = “0”
EQ3
EQC2 bit = “1”
EQ2 Gain (EQ2G5-0 bits)
EQC3 bit = “0”
EQ4
EQC3 bit = “1”
EQ3 Gain (EQ3G5-0 bits)
EQC4 bit = “0”
EQ5
EQC4 bit = “1”
EQ4 Gain (EQ4G5-0 bits)
EQC5 bit = “0”
EQC5 bit = “1”
EQ5 Gain (EQ5G5-0 bits)
Figure 36. 4-Band EQ Structure
Table 32. EQn Gain Setting (n=2, 3, 4, 5)
EQnG5-0 bits EQG_DATA Gain [dB]
Formula
3FH
255
0
3EH
251
-0.17
3DH
:
247
-0.31
20 log₁₀ (EQG_DATA/256)
02H
11
-27.34
01H
7
-31.26
00H
0
MUTE
(default)
Table 33. Transition Time of EQn Gain (n= 2, 3, 4, 5)
EQnT1-0 Transition Time of EQnG5-0 bits = 3FH ~ 00H
bits
Setting Value fs=8kHz
fs=48kHz
00
256/fs
32ms
5.3ms
(default)
01
2048/fs
256ms
42.7ms
10
8192/fs
1024ms
170.7ms
11
16384/fs
2048ms
341.3ms
016001936-E-00
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2016/03