AK4650 Datasheet, PDF (33/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
■ Digital Attenuator
The AK4650 has a channel-independent digital attenuator (128 levels, 0.5dB step, Mute). The attenuation level of each
channel can be set by the ATTL/R6-0 bits (Table 25). When the DATTC bit = “1”, the ATTL6-0 bits control both Lch and
Rch attenuation levels. When the DATTC bit = “0”, the ATTL6-0 bits control Lch level and ATTR6-0 bits control Rch
level.
ATTL/R6-0
Attenuation
STEP
00H
0dB
01H
−0.5dB
02H
−1.0dB
0.5dB
:
:
7DH
−62.5dB
7EH
−63.0dB
7FH
MUTE (−∞)
-
Table 25. DATT Attenuation Table
(default)
The ATS bit sets the transition time between set values of ATTL/R6-0 bits as either 531/fs or 128/fs (Table 26). When
ATS bit = “0”, a soft transition between the set values occurs (531 levels). It takes 531/fs (11ms@fs=48kHz) from
00H(0dB) to 7FH(MUTE).
ATS
ATT speed
0dB to MUTE
1 step
0
531/fs
4/fs
(default)
1
128/fs
29/fs
Table 26. Transition time between set values of ATTL/R6-0 bits
MS0502-E-01
- 33 -
2007/04