ak4112b AKM Semiconductor, Inc., ak4112b Datasheet - Page 12

• Manufacturer Part Number: ak4112b
• Description: High Feature 96khz 24bit Dir
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4112B includes the digital de-emphasis filter (tc=50/15µs) by IIR filter corresponding to four sampling
frequencies (32kHz, 44.1kHz, 48kHz and 96kHz). When DEAU bit=“1”, the de-emphasis filter is enabled automatically
by sampling frequency and pre-emphasis information in the channel status. The AK4112B goes this mode at default.
Therefore, in Parallel Mode, the AK4112B is always placed in this mode and the de-emphasis filter is controlled by the
status bits in channel 1. In Serial Mode, DEM0/1 and DFS bits can control the de-emphasis filter when DEAU is “0”.
When the “0” data is input to the de-emphasis filter, the output data will be “0” or “-1”. The internal de-empahsis filter is
bypassed and the recovered data is output without any change if either pre-emphasis or de-emphasis Mode is OFF.
MS0078-E-02
De-emphasis Filter Control
Table 8. De-emphasis Manual Control at DEAU=“0” and PEM=“1”
Table 7. De-emphasis Auto Control at DEAU=“1” and PEM=“1”
FS96
DFS
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
DEM1
FS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
- 12 -
DEM0
FS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
44.1kHz
44.1kHz
48kHz
32kHz
96kHz
48kHz
32kHz
96kHz
Mode
Mode
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Default
[AK4112B]
2004/04