AK4359_06 Datasheet, PDF (20/33 Pages) Asahi Kasei Microsystems – 106dB 192kHz 24-Bit 8ch DAC

ASAHI KASEI
[AK4359]
„ System Reset
The AK4359 should be reset once by bringing RSTB pin = ”L” upon power-up. The AK4359 is powered up and the
internal timing starts clocking by LRCK “↑” after exiting reset and power down state by MCLK. The AK4359 is in the
power-down mode until MCLK and LRCK are input.
„ Power ON/OFF timing
All DACs are placed in the power-down mode by bringing RSTB pin “L” and the registers are initialized. the analog
outputs go to VCOM. As some click noise occurs at the edge of RSTB signal, the analog output should be muted
externally if the click noise influences system application.
Each DAC can be powered down by setting each power-down bit (PW1-4) to “0”. In this case, the registers are not
initialized and the corresponding analog outputs go to VCOM. As some click noise occurs at the edge of RSTB signal, the
analog output should be muted externally if the click noise influences system application.
Power
RSTB pin
Internal
State
Normal Operation
DAC In
(Digital)
“0”data
DAC Out
(Analog)
(2)
(3)
Clock In
Don’t care
MCLK,LRCK,SCLK
DZF1/DZF2
External
Mute
(5)
Mute ON
GD ⁽¹⁾
Reset
“0”data
GD
(3)
(2)
(4)
Don’t care
(6)
Mute ON
Notes:
(1) The analog output corresponding to digital input has the group delay (GD).
(2) Analog outputs go to VCOM at the power-down mode.
(3) Click noise occurs at the edge of RSTB signal. This noise is output even if “0” data is input.
(4) The external clocks (MCLK, BICK and LRCK) can be stopped in the power-down mode (RSTB pin = “L”).
(5) Mute the analog output externally if the click noise (3) influence system application.
The timing example is shown in this figure.
(6) DZF pins are “L” in the power-down mode (RSTB pin = “L”). (DZFB bit = “0”)
Figure 12. Power-down/up Sequence Example
MS0289-E-02
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2006/03