AK4113_1 Datasheet, PDF (19/49 Pages) Asahi Kasei Microsystems – 192KHZ 24BIT DIR WITH 6:1 SELECTOR

ASAHI KASEI
[AK4113]
The pre-emphasis information is detected and reported on PEM bit. This information is extracted from channel 1 by
default. It can be switched to channel 2 by the CS12 bit in control register.
PEM bit Pre-emphasis
Byte 0
Bits 3-5
0
OFF
≠ 0X100
1
ON
0X100
Table 6. PEM in Consumer Mode
PEM bit Pre-emphasis
Byte 0
Bits 2-4
0
OFF
≠110
1
ON
110
Table 7. PEM in Consumer Mode
„ De-emphasis Filter Control
The AK4113 includes a digital de-emphasis filter (tc=50/15µs). This is an IIR filter that corresponds to four sampling
frequencies (32kHz, 44.1kHz and 48kHz). When DEAU bit=“1”, the de-emphasis filter is enabled automatically by the
sampling frequency and pre-emphasis information in the channel status. The AK4113 is in this mode by default. In
parallel control mode, the AK4113 is always placed in this mode and the status bits in channel 1 control the de-emphasis
filter. In serial control mode, DEM1-0 bits control the de-emphasis filter when the DEAU is “0”. The internal
de-emphasis filter is bypassed and the recovered data is available without any change if the de-emphasis mode is OFF.
When the PEM bit is “0”, the internal de-emphasis filter is always bypassed.
PEM bit
1
1
1
1
0
FS3 bit
FS2 bit
FS1 bit
FS0 bit
Mode
0
0
0
0
44.1kHz
0
0
1
0
48kHz
0
0
1
1
32kHz
(Others)
OFF
x
x
x
x
OFF
Table 8. De-emphasis Auto Control at DEAU bit = “1” (Default)
PEM bit DEM1 bit DEM0 bit
Mode
1
0
0
44.1kHz
1
0
1
OFF
Default
1
1
0
48kHz
1
1
1
32kHz
0
x
x
OFF
Table 9. De-emphasis Manual Control at DEAU bit = “0”
MS0349-E-02
- 19 -
2005/08