AK4456 Datasheet, PDF (59/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz Advanced 32-bit DAC

[AK4456]
■ Power Off and Reset Functions
RSTN
1
1
1
1
1
0
0
0
0
0
PW1/2/3
000
100
010
001
111
000
100
010
001
111
DAC1/2/3
Register Digital
Analog Output
DAC1 DAC2 DAC3
OFF/OFF/OFF Hold Off
Hi-Z
Hi-Z
Hi-Z
ON/OFF/OFF Hold On normal
Hi-Z
Hi-Z
OFF/ON/OFF Hold On
Hi-Z
normal
Hi-Z
OFF/OFF/ON Hold On
Hi-Z
Hi-Z
normal
ON/ON/ON Hold On normal normal normal
OFF /OFF/OFF Hold Off
Hi-Z
Hi-Z
Hi-Z
ON/OFF/OFF Hold Off VREFH/2 Hi-Z
Hi-Z
OFF/ON/OFF Hold Off
Hi-Z VREFH/2 Hi-Z
OFF/OFF/ON Hold Off
Hi-Z
Hi-Z VREFH/2
ON/ON/ON Hold Off VREFH/2 VREFH/2 VREFH/2
Table 27. Power Off and Reset Function
(1) Power OFF Function 1 (PW1-3 bits)
All DAC1-3 can be powered down immediately by setting PW1-3 bits to “000”. 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.
PW1-3 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 PW1-3 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 (PW1-3 bits = “000”).
Figure 59. Power-off/on Sequence Example 1
015006886-E-00
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2015/06