AK4344ET AKM [Asahi Kasei Microsystems], AK4344ET Datasheet - Page 14

• Manufacturer Part Number: AK4344ET
• Description: 100dB 96kHz 24-Bit Stereo 3.3V ?? DAC
• Manufacturer: AKM [Asahi Kasei Microsystems]

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A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15µs) and is controlled by DEM0
and DEM1. In case of double speed and quad speed mode, the digital de-emphasis filter is always off.
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The AK4344 is placed in the power-down mode by bringing PDN pin = “L”. and the digital filter is reset at the same time.
This reset should always be done after power up.
Notes:
MS0641-E-00
De-emphasis Filter
Power-down
(1) PDN pin should be “L” for 19ms or more when an electrolytic capacitor 4.7μF is attached between VCOM pin and
(2) The analog output corresponding to digital input has the group delay (GD).
(3) When PDN pin = “L”, the analog output is Hi-Z.
(4) Click noise occurs in 3 ∼ 4LRCK at both edges (↑ ↓) of PDN signal. This noise is output even if “0” data is input.
(5) The external clocks (MCLK, BICK and LRCK) can be stopped in the power down mode (PDN pin = “L”).
(6) Please mute the analog output externally if the click noise (4) influences system application. The timing example
VSS.
is shown in this figure.
D/A Out
Clock In
MCLK, BICK, LRCK
Internal
D/A In
PDN
External
MUTE
(Digital)
(Analog)
State
(6)
Normal Operation
Table 4. De-emphasis Filter Control (Normal Speed Mode)
Figure 14. Power-down/up sequence example
DEM1
GD
0
0
1
1
(4)
(2)
DEM0
(5)
- 14 -
0
1
0
1
Power-down
Mute ON
“0” data
Don’t care
(3)
(1)
44.1kHz
48kHz
32kHz
Mode
OFF
(default)
(4)
Normal Operation
GD
(2)
2007/06