ak4520a AKM Semiconductor, Inc., ak4520a Datasheet - Page 11

• Manufacturer Part Number: ak4520a
• Description: 100db 20bit Stereo Adc & Dac
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The ADC of AK4520A has a digital high pass filter for DC offset cancel. The cut-off frequency of the HPF is
0.9Hz at fs=44.1kHz and also scales with sampling rate(fs).
The DAC of AK4520A includes the digital de-emphasis filter(tc=50/15us) by IIR filter. This filter corresponds to
three frequencies (32kHz,44.1kHz,48kHz). The de-emphasis filter selected by DEM0 and DEM1 is enabled for
input audio data. The de-emphasis is also disabled at DEM0="1" and DEM1="0".
0163-E-00
Digital High Pass Filter
De-emphasis filter
Table 3 . De-emphasis filter control
DEM 1
0
0
1
1
DEM0
0
1
0
1
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44.1kHz
48kHz
32kHz
Mode
OFF
[AK4520A]
1997/3