AK4691EG AKM [Asahi Kasei Microsystems], AK4691EG Datasheet - Page 49

• Manufacturer Part Number: AK4691EG
• Description: 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

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The AK4691 has a digital output volume (256 levels, 0.5dB step, Mute). The volume can be set by the DVL7-0 and
DVR7-0 bits. The volume is placed in front of a DAC block. The input data of DAC is changed from +12 to –115dB or
MUTE. When the DVOLC bit = “1”, the DVL7-0 bits control both Lch and Rch attenuation levels. When the DVOLC bit
= “0”, the DVL7-0 bits control Lch level and DVR7-0 bits control Rch level. This volume has a soft transit function. The
DVTM bit sets the transition time between set values of DVL/R7-0 bits as either 1061/fs or 256/fs
DVTM bit = “0”, a soft transition between the set values occurs (1062 levels). It takes 1061/fs (=22.1ms@fs=48kHz)
from 00H (+12dB) to FFH (MUTE).
MS0672-E-00
Digital Output Volume
DVTM bit
0
1
Table 40. Transition Time Setting of Digital Output Volume
Transition time between DVL/R7-0 bits = 00H and FFH
1061/fs
Setting
256/fs
Table 39. Digital Volume Code Table
DVL/R7-0 bits
FDH
FEH
FFH
00H
01H
02H
18H
:
:
- 49 -
fs=8kHz
133ms
32ms
MUTE (−∞)
−114.5dB
−115.0dB
+12.0dB
+11.5dB
+11.0dB
Gain
0dB
:
:
fs=48kHz
(default)
22.1ms
5.3ms
(default)
(Table
40). When
[AK4691]
2007/11