ak4671 AKM Semiconductor, Inc., ak4671 Datasheet - Page 72

• Manufacturer Part Number: ak4671
• Description: Stereo Codec With Mic/rcv/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

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The input digital volume becomes a manual mode when ALC bit is “0”. This mode is used in the case shown below.
IVL7-0 and IVR7-0 bits set the gain of the volume control
control Lch and Rch volume values independently. When IVOLC bit is “1”, IVL7-0 bits controls both channels. The
IVOL value is changed at zero crossing or timeout. Zero crossing timeout period is set by ZTM1-0 bits. If IVL7-0 or
IVR7-0 bits are written during PMADL=PMADR bits = “0”, IVOL operation starts with the written values at the end of
the ADC initialization cycle after PMADL or PMADR bit is changed to “1”.
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The AK4671 has the channel independent side tone volume (5 levels, 6dB step). The volume can be set by the
SVAL/R2-0 bits. The volume is included at mixing path from ALC to 5-band EQ. The output data of ALC is changed
from 0 to –24dB.
MS0666-E-00
Input Digital Volume (Manual Mode)
Side Tone Volume (SVOLA)
1. After exiting reset state, set-up the registers for the ALC operation (ZTM1-0, LMTH1-0 and etc)
2. When the registers for the ALC operation (Limiter period, Recovery period and etc) are changed.
3. When IVOL is used as a manual volume.
For example, in case of changing the sampling frequency.
(default)
Table 34. Side Tone Volume A Code Table (N/A: Not available)
IVL7-0 bits
IVR7-0 bits
SVL2-0
Table 33. Input Digital Volume Setting
Others
0H
1H
2H
3H
4H
EFH
F1H
F0H
92H
90H
03H
02H
01H
00H
91H
:
:
- 72 -
(Table
− 12dB
− 18dB
− 24dB
− 6dB
GAIN (dB)
Gain
N/A
0dB
+35.625
− 53.625
+35.25
+0.375
− 0.375
− 53.25
MUTE
+36.0
− 54
0.0
:
:
33). When IVOLC bit is “0”, IVL7-0 and IVR7-0 bits
(default)
0.375dB
Step
[AK4671]
2007/10