ak4634 AKM Semiconductor, Inc., ak4634 Datasheet - Page 28

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ak4634

Manufacturer Part Number
ak4634
Description
16-bit Mono Codec With Alc & Mic/spk-amp
Manufacturer
AKM Semiconductor, Inc.
Datasheet

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b) PLL reference clock: BICK or LRCK pin
The external clocks (MCKI, BICK and FCK) should always be present whenever the ADC or DAC or SPK or
Programmable Filter is in operation (PMADC bit = “1”, PMDAC bit = “1”, PMSPK bit = “1”, PMPFIL bit = “1”). If these
clocks are not provided, the AK4634 may draw excess current and it is not possible to operate properly because utilizes
dynamic refreshed logic internally. If the external clocks are not present, the ADC, DAC, SPK and Programmable Filter
should be in the power-down mode.(PMADC = PMDAC = PMSPK = PMPFIL bits = “0”).
Rev. 0.5
Sampling frequency corresponds to 7.35kHz to 48kHz by changing FS3-0 bits.
Figure 21 PLL Slave Mode 2 (PLL Reference Clock: BICK pin)
Figure 22. PLL Slave Mode 2 (PLL Reference Clock: FCK pin)
AK4634
AK4634
MCKO
MCKI
BICK
FCK
SDTO
SDTI
MCKO
MCKI
BICK
FCK
SDTO
SDTI
16fs, 32fs, 64fs
≥16fs
- 28 -
1fs
1fs
BCLK
FCK
SDTI
SDTO
BCLK
FCK
SDTI
SDTO
DSP or μP
DSP or μP
(Table
6)
[AK4634]
2007/10

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