[AK4675]
2) SPK-Amp (SPIN to SPP/SPN)
Power Supply
(1)
PDNA pin
(2)
PMVCMA bit
PMOSC bit
Don’t care
MCKIA Input
(3)
Don’t care
(9)≥ 500us
(4)≥ 0s
PMSPK bit
SPIN pin
(5)
(5)
Hi-Z
Hi-Z
VCOMA
Hi-Z
VCOMA
(6)≥ 1.6ms
(6) ≥ 1.6ms
SPGA bits
Default
Default
xxH
xxH
Default
Disable
ALCA bit
(7)
(7)
Disable
Enable
Enable
ALCA state
Disable
0V
(10)VCOM(No signal)
Signal Output
(10)VCOM(No signal)
0V
Signal Output
0V
LOUT3/ROUT3 pins
SPP/SPN pins
(8)
(8)
0V
0V
Normal
Normal
0V
Figure 88. SPK-Amp Power-up/down Sequence Example
(1) The PDNA pin should be changed from “L” to “H” after the power is supplied.
“L” time of 150ns or more is needed to reset the AK4675.
The PDNA pin must be held to “L” until all power supply pins are applied. After that, the PDNA pin should be set
to “H”.
(2) Power-up of VCOMA (and the internal clock oscillator in case of OSCN bit = “0”): PMVCMA= PMOSC bits = “0”
Æ “1”. OSCN and MSEL bits should be set during this period.
(3) In case of OSCN bit = “0”, the external clock (MCKIA pin) is not needed.
In case of OSCN bit = “1”, the external clock (MCKIA pin) is needed.
(4) Speaker-Amp power-up: PMSPK bit = “0”Æ “1”
Stereo line output3 power-up: PMLO3/RO3 bits = “0”Æ “1”(LOPS3 bit = “0”)
(5) The SPIN pin goes to “H” in 26.3ms (max) when OSCN bit = “0”, in the time shown in Table 75 when OSCN bit=
“1”.
(6) SPGA5-0 bits setting: When PMSP bits = “0”, SPGA5-0 bits are default value (0dB). The setting of SPKG5-0 and
ALCA bits is enabled at 1.6ms or more after PMSP bits are set to “1” at OSCN bit = “0” or after the power-up time in
Table 91 at OSCN bit = “1”.
(7) ALCA setting: ALCA is enabled at 30ms (max.) in case of OSCN bit = “0”, at 36864/MCKIA (= 18ms @ MCKIA =
2.048MHz) in case of OSCN bit = “1” & MSEL bit = “0”, or 55296/MCKIA (= 18ms @ MCKIA = 3.072MHz) in
case of OSCN bit = MSEL bit = “1”. Refer to “Example of ALCA Operation”.
(8) Speaker-Amp goes to normal operation at 48ms (max.) after PMSPL/R bits is changed to “1” in case of OSCN bit =
“0” or after the power-up time in Table 90 in case of OSCN bit = “1”.
MS0963-E-00
2008/05
- 121 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
