AK4452 Datasheet, PDF (57/82 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 2ch Premium DAC

[AK4452]
■ Power Off and Reset Functions
RSTN PW1
DAC
Register
Digital
Analog Output
DAC
1
0
OFF
Hold
Off
Hi-Z
1
1
ON
Hold
On
normal
0
0
OFF
Hold
Off
Hi-Z
0
1
ON
Hold
Off
VREFH/2
Table 25. Power Off and Reset Function
(1) Power OFF Function 1 (PW1 bit)
The DAC can be powered down immediately by setting PW1 bit to “0”. In this time, all circuits except
registers are powered down and the analog output goes to floating state (Hi-z). Figure 56 shows a timing
example of power-on and power-down.
PW1 bit
Internal
State
D/A In
(Digital)
D/A Out
(Analog)
Clock In
MCLK, BICK, LRCK
DZF
Normal Operation
Power-off
“0” data
GD (1)
(3) (2)
Don’t care
(5)
Normal Operation
GD (1)
(3)
External
MUTE
(4)
Mute ON
Notes:
(1) The analog output corresponding to digital input has group delay (GD).
(2) Analog outputs are floating (Hi-Z) in power down mode.
(3) Small pop noise occurs at the edges(“ ”) of the internal timing of PW1 bit. This noise is output even
if “0” data is input.
(4) Mute the analog output externally if click noise (3) adversely affect system performance.
(5) The DZF pin outputs “L”, in power down mode (PW1 bit = “0”).
Figure 56. Power-off/on Sequence Example
015002211-E-02
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2015/08