AK4126 Datasheet, PDF (18/27 Pages) Asahi Kasei Microsystems – 6ch 192kHz / 24-Bit Asynchronous SRC

ASAHI KASEI
[AK4126]
2. Semi-Auto mode
The soft mute is cancelled automatically by the setting of PLL2-0 pins (refer to Table 2), after the AK4126 detects the
rising edge (PDN pin = “L” → “H”) and the mute is continued during 4410/fso=100ms@fso=44.1kHz. After PDN pin =
“L” → “H” and when SMUTE pin is “H”, the mute is not cancelled.
PDN pin
“L”
SM UTE pin
0dB
A tte n u a tio n
-∞
Don’t care
4410/fso
“L”
(1)
SDTO
Note: SDTO shows SDTO1, SDTO2 and SDTO3.
(1) The output data is attenuated by −∞ during the soft mute cycle (See Table 6)
Figure 11. Soft Mute Function (Semi-Auto Mode)
„ Dither
The AK4126 includes the dither circuit. The dither circuit adds the dither to the LSB of all the output data set with the
OBIT1-0 pins by DITHER pin = “H”.
„ De-emphasis Filter
The AK4126 includes a digital de-emphasis filter (tc = 50/15µs) via an IIR filter. This filter corresponds to three
frequencies (32kHz, 44.1kHz and 48kHz). This setting is done via DEM1-0 pins (See Table 7), and it is applied to all input
data.
DEM1pin DEM0 pin
Mode
L
L
44.1kHz
L
H
OFF
H
L
48kHz
H
H
32kHz
Table 7. De-emphasis Filter Setting
MS0544-E-00
- 18 -
2006/09