AK5701_07 Datasheet, PDF (38/64 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo ADC with PLL & MIC-AMP

[AK5701]
■ Input Digital Volume (Manual Mode)
The input digital volume becomes a manual mode when ALC bit is “0”. This mode is used in the case shown below.
1. After exiting reset state, set-up the registers for the ALC operation (ZTM1-0, LMTH and etc)
2. When the registers for the ALC operation (Limiter period, Recovery period and etc) are changed.
For example; when the change of the sampling frequency.
3. When IVOL is used as a manual volume.
IVL7-0 and IVR7-0 bits set the gain of the volume control (Table 29). 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”.
IVL7-0
IVR7-0
F1H
F0H
EFH
:
92H
91H
90H
:
03H
02H
01H
00H
GAIN (dB)
Step
+36.0
+35.625
+35.25
:
+0.375
0.0
0.375dB
−0.375
:
−53.25
−53.625
−54
MUTE
Table 29. Input Digital Volume Setting
(default)
MS0404-E-02
- 38 -
2007/08