AK4613 Datasheet, PDF (50/69 Pages) Asahi Kasei Microsystems – 4/12-Channel Audio CODEC

[AK4613]
■ DAC partial Power-Down Function
All of the DACs can be powered-down individually by PMDA6-1 bits. The analog section and the digital section of the
DAC are placed in power-down mode when the PMDA6-1 bits = “0”. The analog output of the powered-down channels,
which is by PMDA6-1 bits, go to the voltage of VCOM when the DVMPD pin is “L”, and go to Hi-Z when the DVMPD
pin “H”. Although DZF detection is in operation, the AK4613 stops reflecting the result of DZF detection to DZF1-2 pins.
Some click noise occurs in both set-up and release of power-down. Mute the analog output externally or set PMDA1-6
bits when PMDAC bit = “0” or RSTN bit = “0”, if click noise aversely affects system performance. Figure 48 shows the
sequence of the power-down and the power-up by PMDA6-1 bits.
PMDA6-1 bit
Power Down Channel
4~5/fs (4)
DAC Digital
Internal State
Normal Operation
DAC Analog
Internal State
Normal Operation
2~3/fs (5)
4~5/fs (4)
2~3/fs (5)
Power-down
Power-down
Normal Operation
Power-down
516/fs (6)
Init Cycle Normal Operation Power-down
Normal Operation
516/fs (6)
Init Cycle Normal Operation
DAC In
(Digital)
DAC Out
(Analog)
DZF Detect
Internal State
(1)
GD
(3) ₍₂₎
8192/fs
(7)
Normal Operation Channel
DAC In
(Digital)
DAC Out
(Analog)
“0”data
GD
8192/fs
DZF Detect
Internal State
“0”data
(3)
(3) ₍₂₎
(7)
GD
GD
(3)
Clock In
MCLK,LRCK,SCLK
(8)
DZF1/DZF2
(9)
Notes:
(1) Digital output corresponding to the analog inputs, and analog outputs corresponding to the digital inputs have group
delay (GD).
(2) Analog output of the DAC powered down by PMDA6-1 = “0” and goes to VCOM voltage when the DVMPD pin
=“L”, and the analog outputs go to Hi-Z when the DVMPD pin =“H”.
(3) Click noise occurs at 4∼5/fs after RSTN bit becomes “0”, and occurs at 3∼4/fs after RSTN bit becomes “1”. after
PMDA6-1 bits are changed, some click noise occurs immediately at output of the channel changed by the own PD
bits.
(4) The DACs will be powered-down 4~5fs after PMDA6-1 bits = “0”
(5) The initiation stars 2~3fs after PMDA6-1 bits are set to “1”.
(6) The analog parts of DACs are initialized after exiting power down mode.
(7) Although DZF detection is active at a certain channel set up though PMDA6-1 = “0”, the AK4613 stops reflecting
the result of DZF detection to DZF1-2 pins.
(8) DZF detection of the DAC which is set up by the power-down setting is ignored, and DZF1-2 pins go to “H”.
(9) When signal is input to a DAC, even if the partial power down is applied, DZF1-2 pins will not become “H”.
Figure 48. DAC partial power-down example
MS1052-E-02
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2010/03