ASAHI KASEI
[AK4317]
Figure 2 . Mode 0,1 Timing
Figure 3 . Mode 2 Timing
Figure 4 . Mode 3 Timing
De-emphasis filter
The AK4317 includes the digital de-emphasis filter(tc=50/15us) by IIR filter.This filter corresponds to
three sampling frequencies(32kHz,44.1kHz,48kHz). De-emphasis is enabled by the following two ways.
1. DEM pin
Only one de-emphasis(fs=44.1kHz) set initially can be controlled by DEM pin at resetting. The de-
emphasis is enabled by setting DEM pin "H". When the frequency of de-emphasis is set by FS0,FS1 of
serial mode control bits, the corresponding de-emphasis can be enabled. In this case, DEM bit in the
serial mode control should be "0".
2. DEM bit in the serial mode control
DEM pin should be open or "L". In this case, The de-emphasis corresponding to fs=32kHz,
44.1kHz,48kHz can be controlled by DEM, FS0 and FS1 in the serial mode control bits.
0172-E-01
1997/5
- 10 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
