AK4552 Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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AK4552

3V 96kHz 24Bit ∆Σ CODEC

Asahi Kasei Microdevices 

ASAHI KASEI

[AK4552]

„ Audio Serial Interface Format

Data is shifted in/out the SDTI/SDTO pins using BCLK and LRCK inputs. The data is MSB first, 2’s compliment.

LRCK

01 2

BCLK(64fs)

8 9 10

24 21

SDTO(o)

23 22

16 15 14

0

31 0 1 2

8 9 10

24 21

23 22

16 15 14

0

31 0 1

23

SDTI(i)

Don’t Care 23 22

12 11

1 0 Don’t Care

23:MSB, 0:LSB

Lch Data

Figure 5. Audio Data I/F Timing

23 22

12 11

Rch Data

10

„ De-emphasis Filter

The DAC of AK4552 includes the digital de-emphasis filter (tc=50/15µs) 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

DEM0

Mode

0

0

44.1kHz

0

1

OFF

1

0

48kHz

1

1

32kHz

Table 3. De-emphasis filter control

„ Digital High Pass Filter

The AK4552 has a Digital High Pass Filter (HPF) for DC-offset cancel. The cut-off frequency of the HPF is 3.4Hz at

fs=44.1kHz and the frequency response at 20Hz is -0.12dB. It also scales with the sampling frequency (fs).

MS0055-E-01

- 10 -

2001/02

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