AK4317 Datasheet, PDF (14/19 Pages) Asahi Kasei Microsystems – 18BIT SCF DAC WITH ATT & MIXER

ASAHI KASEI
„ Power-Down
[AK4317]
The AK4317 are placed in the power-down mode by bringing PD pin "L" and the analog outputs are
floating(Hi-Z). Figure 8 shows an example of the system timing at the power-down and power-up.
Figure 8 . Power-down/up sequence example
Notes:
{¹ Analog output corresponding to digital input have the group delay(GD).
{² Analog outputs are floating(Hi-Z) at the power-down mode.
{³ Click noise about -50dB occurs at the edges("↑↓") of PD signal.
This noise is output even if "0" data is input.
{⁴ When the external clocks(MCLK,BICK,LRCK) are stopped, the AK4317 should be in the power-
down mode.
{⁵ Please mute the analog output externally if the click noise({³ ) influences system application.
The timing example is shown in this figure.
„ System Reset
The AK4317 should be reset once by bringing PD "L" upon power-up. The AK4317 is powered up and
the internal timing starts clocking by LRCK "↑" after exiting reset and power down state by MCLK. The
AK4317 is in power-down mode until LRCK is input.
„ Click Noise from analog output
Click noise occurs from analog output in the following cases.
{¹ When switching de-empahsis mode by DEM bit or DEM pin.
{² When switching serial data mode by DIF0,DIF1 pins,
{³ When going and exiting power down mode by PD pin,
However in case of {¹ & {² , If the input data is "0" or the soft mute is enabled (after 1024 LRCK cycles
from SMUTE="H"), no click noise occur.
0172-E-01
- 14 -
1997/5