AK4527B View Datasheet(PDF) - Asahi Kasei Microdevices

Part Name

Description

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AK4527B

High Performance Multi-channel Audio CODEC

Asahi Kasei Microdevices 

ASAHI KASEI

[AK4527B]

LRCK

fs

32.0kHz

44.1kHz

48.0kHz

88.2kHz

96.0kHz

MCLK (MHz)

256fs

512fs

-

16.3840

-

22.5792

-

24.5760

22.5792

-

24.5760

-

Sampling

Speed

Normal

Double

Table 5. System Clock Example (Auto Setting Mode)

n De-emphasis Filter

The AK4527B includes the digital de-emphasis filter (tc=50/15µs) by IIR filter. This filter corresponds to three sampling

frequencies (32kHz, 44.1kHz, 48kHz). De-emphasis of each DAC can be set individually by register data of DEMA1-C0

(DAC1: DEMA1-0, DAC2: DEMB1-0, DAC3: DEMC1-0, see “Register Definitions”).

Mode

0

1

2

3

4

5

6

7

Sampling Speed

Normal Speed

Normal Speed

Normal Speed

Normal Speed

Double Speed

Double Speed

Double Speed

Double Speed

DEM1

0

0

1

1

0

0

1

1

DEM0

0

1

0

1

0

1

0

1

DEM

44.1kHz

OFF

48kHz

32kHz

OFF

OFF

OFF

OFF

Default

Table 6. De-emphasis control

n Digital High Pass Filter

The ADC 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).

n Audio Serial Interface Format

Four serial data modes can be selected by the DIF0 and DIF1 pins (P/S = “H”) or bits (P/S = “L”) as shown in Table 7. In

all modes the serial data is MSB-first, 2’s compliment format. The SDTO is clocked out on the falling edge of BICK and

the SDTI/DAUX are latched on the rising edge of BICK.

Figures 1∼4 shows the timing at SDOS = “L”. In this case, the SDTO outputs the ADC output data. When SDOS = “H”,

the data input to DAUX is converted to SDTO’s format and output from SDTO. Mode 2 and mode 3 in SDTI/DAUX

input formats can be used for 16-20bit data by zeroing the unused LSBs.

Mode

0

1

2

3

DIF1

0

0

1

1

DIF0

0

1

0

1

SDTO

24bit, MSB justified

24bit, MSB justified

24bit, MSB justified

24bit, IIS (I2S)

SDTI1-3, DAUX

20bit, LSB justified

24bit, LSB justified

24bit, MSB justified

24bit, IIS (I2S)

LRCK

H/L

H/L

H/L

L/H

Default

Table 7. Audio data formats

MS0056-E-00

- 15 -

2000/10

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