AK5700 Datasheet, PDF (37/61 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Mono ADC with PLL & MIC-AMP

ASAHI KASEI
[AK5700]
„ 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 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 bits are written during PMADC bit = “0”, IVOL operation starts with the written values at the end of the ADC
initialization cycle after PMADC bit is changed to “1”.
IVL7-0
GAIN (dB)
Step
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
92H
+0.375
91H
0.0
0.375dB
90H
−0.375
:
:
03H
−53.25
02H
−53.625
01H
−54
00H
MUTE
Table 29. Input Digital Volume Setting
Default
MS0569-E-01
- 37 -
2006/12