AK4643 Datasheet, PDF (30/104 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP/RCV/SPK-AMP

ASAHI KASEI
[AK4643]
b) PLL reference clock: BICK or LRCK pin
Sampling frequency corresponds to 7.35kHz to 48kHz by changing FS3-0 bits (see Table 7).
AK4643
MCKO
MCKI
BICK
LRCK
SDTO
SDTI
DSP or µP
32fs or 64fs
1fs
BCLK
LRCK
SDTI
SDTO
Figure 21. PLL Slave Mode 2 (PLL Reference Clock: BICK pin)
AK4643
MCKO
MCKI
BICK
LRCK
SDTO
SDTI
≥ 32fs
1fs
DSP or µP
BCLK
LRCK
SDTI
SDTO
Figure 22. PLL Slave Mode 2 (PLL Reference Clock: LRCK pin)
The external clocks (MCKI, BICK and LRCK) should always be present whenever the ADC or DAC is in operation
(PMADL bit = “1”, PMADR bit = “1” or PMDAC bit = “1”). If these clocks are not provided, the AK4643 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 and DAC should be in the power-down mode (PMADL=PMADR=PMDAC bits = “0”).
MS0476-E-01
- 30 -
2006/10