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AK4586VQ

Multi-channel Audio CODEC with DIR

Asahi Kasei Microdevices 

ASAHI KASEI

[AK4586]

De-emphasis Filter Control

The AK4586 includes the digital de-emphasis filter (tc=50/15µs) by IIR filter corresponding to three sampling

frequencies (32kHz, 44.1kHz and 48kHz). When DEAU bit = “1”, the de-emphasis filter is enabled automatically by

sampling frequency and pre-emphasis information in the channel status. The AK4586 goes to this mode at default and the

de-emphasis filter is controlled by the status bits in channel 1 (Table 8). DEM1-0 and DFS bits can control the

de-emphasis filter when DEAU is “0” (Table 9). The internal de-empahsis filter is bypassed and the recovered data is

output without any change if either pre-emphasis or de-emphasis mode is OFF. The internal de-emphasis filter is

bypassed if the Non-PCM or the DTS-CD bitstream is detected at DEAU= “1”. The internal de-emphasis filter is

bypassed if bit 0 of the channel status byte 0 is “1”.

RFS96

FS1

0

0

0

0

0

1

0

1

1

0

1

0

1

1

1

1

FS0

DEM

0

44.1kHz

1

OFF Default

0

48kHz

1

32kHz

0

OFF

1

OFF

0

OFF

1

OFF

Table 8. De-emphasis Auto Control at DEAU=“1” and PEM=“1”

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 9. De-emphasis Manual Control at DEAU=“0” and PEM=“1”

System Reset and Power-Down

The AK4586 has a power-down mode for all circuits by PDN pin or can be partially powered-down by internal register.

The AK4586 should be reset once by bringing PDN pin = “L” upon power-up. ADC, DAC and PLL are powered-down at

PWVRN= “0”.

PDN

L

x

x

x

x

x

x

PWADN

x

0

x

x

x

x

x

PWDAN

x

x

0

x

x

x

x

PWVRN

x

x

x

0

x

x

x

RSTN

x

x

x

x

0

x

x

CM1-0

x

x

x

x

x

00

01

Function

All power down

ADC power down

DAC power down

VREF power down

Timing Reset

X’tal power down

PLL power down

Register initialization

Yes

No

No

No

No

No

No

Table 10. Reset & Power Down

MS0097-E-01

- 21 -

2001/12

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