ak4387 AKM Semiconductor, Inc., ak4387 Datasheet - Page 13

• Manufacturer Part Number: ak4387
• Description: 106db 192khz 24-bit 2ch ?? Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4387 should be reset once by bringing RSTN pin = “L” upon power-up. The AK4387 is powered up and the
internal timing starts clocking by LRCK “↑” after exiting reset and power down state by MCLK. The AK4387 is in the
power-down mode until MCLK and LRCK are input.
The AK4387 is placed in the power-down mode by bringing RSTN pin “L” and the anlog outputs become VCOM voltage
(AVDD/2). Figure 6 shows an example of the system timing at the power-down and power-up.
Notes:
MS0429-E-00
System Reset
Power-down
(1) The analog output corresponding to digital input has the group delay (GD).
(2) Analog outputs are VCOM voltage (AVDD/2) at the power-down mode.
(3) Click noise occurs at the edge of RSTN 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 (RSTN pin = “L”).
(5) Please mute the analog output externally if the click noise (3) influences system application.
(6) DZF pin is “L” in the power-down mode (RSTN pin = “L”).
Internal
D/A In
D/A Out
Clock In
MCLK, LRCK, BICK
RSTN
External
MUTE
DZF
The timing example is shown in this figure.
(Digital)
(Analog)
State
(5)
Normal Operation
Figure 6. Power-down/up Sequence Example
GD
(1)
(3)
(6)
- 13 -
(4)
Mute ON
Power-down
“0” data
Don’t care
(2)
(3)
Normal Operation
GD
(1)
[AK4387]
2005/09