AK4637 Datasheet, PDF (49/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
Common Gain Sequence Examples
<When noise is generated>
IN
OUT
EQn
EQCn bit = “0”
EQCn bit = “1”
EQn Gain (EQnG5-0 bits)
(assuming the noise continues)
(1) Set EQCn bit: “1” → “0” (Path Setting). The gain changes immediately by this setting.
(2) Set EQnT1-0 bits: “xx” → “00” (Transition Time)
(3) Set EQnG5-0 bits: “xxH” → “3FH” (Gain Setting; should be set to 0dB)
<When noise is stopped>
IN
OUT
EQn
EQCn bit = “0”
EQCn bit = “1”
EQn Gain (EQnG5-0 bits)
(4) Set EQCn bit: “0” → “1” (Path Setting), EQnT1-0 bits Setting
(Transition Time: It should be set longer when noise is stopped.) (Note 34)
(5) Set EQnG5-0 bits (Gain Setting)
The gain of EQn is changed after a transition time set by EQnT1-0 bits.
Note 34. When changing a path of EQC2-5 by setting EQC2-5 bits “0” → “1”, the gain should be
transitioned to 0dB before the settings. Otherwise, pop noise may occur on the path change.
015010680-E-00
- 49 -
2015/09