AK4633 Datasheet, PDF (72/82 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4633]
<Example>
This sequence is an example of ALC1 setting at fs=16kHz. If the parameter of the ALC1 is changed, please refer to
“Table 32. Example of the ALC Setting (Recording)“
At first, clocks should be supplied according to “Clock Set Up” sequence.
(1) Set up a sampling frequency (FS3-0 bit) and ADC initialization cycle. When the AK4633 is PLL mode,
Programmable Filter and ADC should be powered-up in consideration of PLL lock time after a sampling
frequency is changed.
(2) Set up MIC input (Addr: 02H)
(3) Set up Timer Select for ALC1 (Addr: 06H)
(4) Set up REF value for ALC1 (Addr: 08H)
(5) Set up IVOL value at start ALC1 (Addr: 09H)
(6) Set up LMTH0, RGAIN0, LMAT1-0, ZELM and ALC1 bits (Addr: 07H)
(7) Set up path of programmable filter: PFSDO bit = ADCPF bit = “1”
(8) Set up coefficient of programmable filter (HPF/EQ): Addr: 10H ∼ 1FH
(9) Set up ON/OFF of programmable filter (HPF/EQ)
HPFAD bit should be set to “1”.
(10) Power Up programmable filter and ADC: PMPFIL bit = PMADC bit = “0” → “1”
The initialization cycle time of ADC is 1059/fs=66ms@fs=16kHz when ADRST bit = “0”,
and 291/fs=18ms@fs=16kHz when ADRST bit = “1”. The ALC1 starts at IVOL value set by (5).
(11) Power Down programmable filter and ADC: PMPFIL bit = PMADC bit = “1” → “0”
MS0447-E-03
- 72 -
2006/04