AK4566 Datasheet, PDF (25/45 Pages) Asahi Kasei Microsystems – 20bit Stereo CODEC with built-in IPGA & HP-AMP

ASAHI KASEI
AKM CONFIDENTIAL
[AK4566]
4) LIN/RIN/MIN → HP-amp, MOUT
Power Supply
PDN pin
PMVCM bit
PMHPL/R bit,
PMMO bit
HPLMT,
HPRMT bit
LIN/RIN/MIN pin
HPL/R pin
(1) >150ns
(2) >0
(3) >0
(4)
(Hi-Z)
(5)
Don’t care
(Hi-Z)
(6)
(5)
MMUTE,
ATTM3-0 bit
10H(MUTE)
0FH(0dB)
MOUT pin
(Hi-Z)
(7)
(7)
(7)
(Hi-Z)
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 50kΩ (typ). In case of 0.1µF input
capacitor, time constant is
τ = 0.1µF x 50kΩ = 5ms (typ)
(5) Rise time of headphone amp is determined by external capacitor of MUTET pin. When C=1µF,
Rise Time of Headphone Amp: τ = 100ms
(6) Fall time of headphone amp is determined by output capacitor for AC coupling. When C=100µF,
Fall Time of Headphone Amp: τ = 200ms
(7) When PMMO bit is changed to “1”, click noise is output from MOUT pin.
REV 0.5
- 25 -
2002/2