AK4618 Datasheet, PDF (38/60 Pages) Asahi Kasei Microsystems – 192kHz 24-bit 6ch/12ch Audio CODEC with Microphone Interface

[AK4618]
■ Digital Attenuator
AK4618 has a channel-independent digital attenuator (256 levels, 0.5dB steps). Attenuation level of each DAC1-6 can be
set by DAATL1/R1 7-0 bits, DAATL2/R2 7-0 bit, DAATL3/R3 7-0 bit, DAATL4/R4 7-0 bit, DAATL5/R5 7-0 bit,
DAATL6/R6 7-0 bit, respectively (Table 14).
DAATL1/R1 7-0bits
DAATL2/R2 7-0 bits
DAATL3/R3 7-0 bits
DAATL4/R4 7-0 bits
Attenuation Level
DAATL5/R5 7-0 bits
DAATL6/R6 7-0 bits
00H
+0dB
(default)
01H
-0.5dB
02H
-1.0dB
:
:
7DH
-62.5dB
7EH
-63.0dB
7FH
-63.5dB
:
:
FEH
-127.0dB
FFH
MUTE (-∞)
Table 14. Attenuation level of DAC Digital Attenuator
Transition time between set values of DAATL1/R1 7-0, DAATL2/R2 7-0, DAATL3/R3 7-0, DAATL4/R4 7-0,
DAATL5/R5 7-0, DAATL6/R6 7-0 bits can be selected by the DAATS1-0 bits (Table 15). Transition between set values
is the soft transition in Mode1/2/3 eliminating switching noise in the transition.
Mode
0
1
2
3
DAATS1
0
0
1
1
DAATS0
0
1
0
1
ATT speed
4080/fs
2040/fs
510/fs
255/fs
(default)
Table 15. Transition Time between Set Values of DAATL1/R1 7-0, DAATL2/R2 7-0, DAATL3/R3 7-0,
DAATL4/R4 7-0, DAATL5/R5 7-0, DAATL6/R6 7-0 bits
The transition between set values is a soft transition of 4080 levels in mode 0. It takes 4080/fs (85ms@fs=48kHz) from
00H to FFH. If the PDN pin goes to “L”, DAATL1/R1 7-0, DAATL2/R2 7-0, DAATL3/R3 7-0, DAATL4/R4 7-0,
DAATL5/R5 7-0, DAATL6/R6 7-0 bits are initialized to 00H. These bits are also set to 00H respectively when RSTN bit
= “0”, and fade to their current value when RSTN bit returns to “1”.
015000617-E-00
- 38 -
2015/01