AK4522 Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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AK4522

20Bit Stereo ∆Σ ADC & DAC

Asahi Kasei Microdevices 

ASAHI KASEI

[AK4522]

n De-emphasis Filter

The DAC of AK4522 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”.

DEM1

0

0

1

1

DEM0

0

1

0

1

Mode

44.1kHz

OFF

48kHz

32kHz

Table 3. De-emphasis filter control

n Soft Mute Operation

Soft mute operation is performed at digital domain. When SMUTE goes to “H”, the output signal is attenuated by -∞

during 1024 LRCK cycles. When SMUTE is returned to “L”, the mute is cancelled and the output attenuation gradually

changes to 0dB during 1024 LRCK cycles. If the soft mute is cancelled within 1024 LRCK cycles after starting the

operation, the attenuation is discontinued and returned to 0dB. The soft mute is effective for changing the signal source

without stopping the signal transmission.

SMUTE

0dB

Attenuation

1024/fs

(1)

1024/fs

(3)

-∞

GD

GD

(2)

Noise level

-100dB

Notes:

(1) The output signal is attenuated by -∞ during 1024 LRCK cycles (1024/fs).

(2) Analog output corresponding to digital input has the group delay (GD).

(3) If the soft mute is cancelled within 1024 LRCK cycles, the attenuation is discontinued and returned to 0dB.

Figure 5. Soft Mute Operation

M0020-E-01

- 11 -

1998/10

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