AK4458 Datasheet, PDF (59/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 8ch Premium DAC

[AK4458]
■ Power Off and Reset Functions
RSTN
1
1
1
1
1
1
0
0
0
0
0
0
PW1/2/3/4
0000
1000
0100
0010
0001
1111
0000
1000
0100
0010
0001
1111
DAC1/2/3/4
Register Digital _DAC1
Analog Output
DAC2 DAC3
OFF/OFF/OFF/OFF Hold Off
Hi-Z
Hi-Z
Hi-Z
ON/OFF/OFF/OFF Hold On normal
Hi-Z
Hi-Z
OFF/ON/OFF/OFF Hold On
Hi-Z
normal
Hi-Z
OFF/OFF/ON/OFF Hold On
Hi-Z
Hi-Z
normal
OFF/OFF/OFF/ON Hold On
Hi-Z
Hi-Z
Hi-Z
ON/ON/ON/ON Hold On normal normal normal
OFF /OFF/OFF/OFF Hold Off
Hi-Z
Hi-Z
Hi-Z
ON/OFF/OFF/OFF Hold Off VREFH/2 Hi-Z
Hi-Z
OFF/ON/OFF/OFF Hold Off
Hi-Z VREFH/2 Hi-Z
OFF/OFF/ON/OFF Hold Off
Hi-Z
Hi-Z VREFH/2
OFF/OFF/OFF/ON Hold Off
Hi-Z
Hi-Z
Hi-Z
ON/ON/ON/ON Hold Off VREFH/2 VREFH/2 VREFH/2
Table 29. Power Off and Reset Function
DAC4
Hi-Z
Hi-Z
Hi-Z
Hi-Z
normal
normal
Hi-Z
Hi-Z
Hi-Z
Hi-Z
VREFH/2
VREFH/2
(1) Power OFF Function 1 (PW1-4 bits)
All DAC1-4 can be powered down immediately by setting PW1-4 bits to “0000”. In this time, all circuits
except registers are powered down and the analog output goes to floating state (Hi-z). Figure 59 shows a timing
example of power-on and power-down.
PW1-4 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 PW1-4 bits. 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 (PW1-4 bits = “0000”).
Figure 59. Power-off/on Sequence Example 1
014011794-E-01
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2015/08