參數(shù)資料
型號: AK4569
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 20-Bit Stereo CODEC with IPGA & HP-AMP
中文描述: 20位立體聲編解碼器與單親遺傳算法
文件頁數(shù): 25/45頁
文件大小: 474K
代理商: AK4569
ASAHI KASEI
[AK4569]
MS0292-E-01
2005/07
- 25 -
4) LIN/RIN/MIN
HP-amp, MOUT
Power Supply
PDN pin
PMVCM bit
HPL/R pin
(5)
MOUT pin
(7)
MMUTE,
ATTM3-0 bit
10H(MUTE)
0FH(0dB)
(Hi-Z)
(Hi-Z)
(7)
(7)
(5)
(6)
LIN/RIN/MIN pin
(4)
(Hi-Z)
(Hi-Z)
PMHPL/R bit,
PMMO bit
Don’t care
HPLMT,
HPRMT bit
(1) >150ns
(2) >0
(3) >0
Figure 20. Power-up/down sequence of LIN/RIN/MIN, HP-amp and MOUT
(1) PDN pin should be set to “H” at least 150ns after the power is supplied.
(2) HPLMT, HPRMT and PMVCM bits should be changed to “1” after PDN pin goes to “H”.
(3) PMHPL, PMHPR, PMMO bits should be changed to “1” and HPLMT, HPRMT bits should be changed to “0” after
HPLMT, HPRMT, PMVCM bits are changed to “1”. Once PMHPL and PMHPR bits are changed to “1”, HPLMT
and HPRMT bits should be inverted from PMHPL and PMHPR bits respectively.
(4) When PMHPL, PMHPR or PMMO bit is changed to “1”, LIN, RIN and MIN are biased to VCOM voltage. Rising
time constant is determined by input capacitor for AC coupling and input resistance 50k
(typ). In case of 0.1μF
input capacitor, time constant is
τ
= 0.1μF x 50k
= 5ms (typ)
(5) Rise time of headphone amp is determined by external capacitor of MUTET pin. When C=1μF,
Rise Time Constant of Headphone Amp:
τ
= 100ms
(6) Fall time of headphone amp is determined by output capacitor for AC coupling. When C=100μF,
Fall Time Constant of Headphone Amp:
τ
= 200ms
(7) When PMMO bit is changed to “1”, pop noise is output from MOUT pin.
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