AK4367VN データシートの表示（PDF） - Asahi Kasei Microdevices

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AK4367VN

Low Power 24-Bit 2ch DAC with HP-AMP & Output Mixer

Asahi Kasei Microdevices 

ASAHI KASEI

[AK4367]

„ Digital Attenuator

The AK4367 has a channel-independent digital attenuator (256 levels, 0.5dB step). This digital attenuator is placed before

the D/A converter. ATTL/R7-0 bits set the attenuation level (0dB to −127dB or MUTE) for each channel (Table 4). At

DATTC bit = “1”, ATTL7-0 bits control both Lch and Rch attenuation levels. At DATTC bit = “0”, ATTL7-0 bits control

the Lch level and ATTR7-0 bits control the Rch level. When HPM bit = “1”, (L+R)/2 summation is done after volume

control.

ATTL7-0

ATTR7-0

Attenuation

FFH

0dB

Default

FEH

−0.5dB

FDH

−1.0dB

FCH

−1.5dB

:

:

:

:

02H

−126.5dB

01H

−127.0dB

00H

MUTE (−∞)

Table 4. Digital Volume ATT values

The ATS bit sets the transition time between set values of ATT7-0 bits as either 1061/fs or 7424/fs (Table 5). When ATS

bit = “0”, a soft transition between the set values occurs(1062 levels). It takes 1061/fs (24ms@fs=44.1kHz) from

FFH(0dB) to 00H(MUTE). The ATTs are 00H when the PMDAC bit is “0”. When the PMDAC returns to “1”, the ATTs

fade to their current value. Digital attenuator is independent of the soft mute function.

ATS

ATT speed

0dB to MUTE

1 step

0

1061/fs

4/fs

Default

1

7424/fs

29/fs

Table 5. Transition time between set values of ATT7-0 bits

MOUT volume is controlled by ATTM3-0 bits when MMUTE bit = “0” (Table 6). Pop noise occurs when ATT3-0 bits

are changed.

MMUTE

ATTM3-0

Attenuation

0FH

0dB

0EH

−2dB

0DH

−4dB

0

0CH

−6dB

:

:

:

:

01H

−28dB

00H

−30dB

1

x

MUTE

Table 6. MOUT Volume ATT values

Default

MS0247-E-02

- 16 -

2005/10

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