AK4636 Datasheet, PDF (32/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
b) PLL reference clock: BICK or LRCK pin
The sampling frequency corresponds to a range from 7.35kHz to 48kHz by changing FS3-0 bits. (Table 6)
AK4636
MCKO
MCKI
BICK
FCK
SDTO
SDTI
DSP or μP
16fs, 32fs, 64fs
1fs
BCLK
FCK
SDTI
SDTO
Figure 26 PLL Slave Mode 2 (PLL Reference Clock: BICK pin)
AK4636
MCKO
MCKI
BICK
FCK
SDTO
SDTI
≥16fs
1fs
DSP or μP
BCLK
FCK
SDTI
SDTO
Figure 27. PLL Slave Mode 2 (PLL Reference Clock: FCK pin)
The external clocks (MCKI, BICK and FCK) should always be present whenever the ADC or DAC or Programmable
Filter is in operation (PMADC bit = “1”, PMDM bit = “1”, PMDAC bit = “1” or PMPFIL bit = “1”). If these clocks are not
provided, the AK4636 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 and Programmable Filter should be in the
power-down mode (PMADC bit = PMDM bit = PMDAC bit = PMPFIL bit = “0”).
MS1012-E-01
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2010/08