ak4113 AKM Semiconductor, Inc., ak4113 Datasheet - Page 19

• Manufacturer Part Number: ak4113
• Description: 192khz 24bit Dir With 6 1 Selector
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
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.
MS0349-E-02
De-emphasis Filter Control
PEM bit
1
1
1
1
0
PEM bit
FS3 bit
1
1
1
1
0
0
0
0
x
Table 8. De-emphasis Auto Control at DEAU bit = “1” (Default)
Table 9. De-emphasis Manual Control at DEAU bit = “0”
DEM1 bit
FS2 bit
PEM bit
PEM bit
0
0
1
1
x
0
0
0
x
0
1
0
1
Table 6. PEM in Consumer Mode
Table 7. PEM in Consumer Mode
(Others)
Pre-emphasis
Pre-emphasis
DEM0 bit
FS1 bit
OFF
OFF
ON
ON
0
1
1
x
0
1
0
1
x
- 19 -
FS0 bit
≠ 0X100
Bits 3-5
Bits 2-4
Byte 0
0X100
Byte 0
0
0
1
x
≠110
110
44.1kHz
48kHz
32kHz
Mode
OFF
OFF
44.1kHz
48kHz
32kHz
Mode
OFF
OFF
Default
[AK4113]
2005/08