ak4633 AKM Semiconductor, Inc., ak4633 Datasheet - Page 72

• Manufacturer Part Number: ak4633
• Description: 16-bit ?? Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
<Example>
MS0447-E-03
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,
(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)
(10) Power Up programmable filter and ADC: PMPFIL bit = PMADC bit = “ 0 ” → “ 1 ”
(11) Power Down programmable filter and ADC: PMPFIL bit = PMADC bit = “ 1 ” → “ 0 ”
Programmable Filter and ADC should be powered-up in consideration of PLL lock time after a sampling
frequency is changed.
HPFAD bit should be set to “ 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).
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[AK4633]
2006/04