[AK4675]
MS0963-E-00
2008/05
- 124 -
a) PLLBT reference clock: SYNCA or BICKA pin
The PLLBT circuit generates the required clock for PCM I/F from SYNCA or BICKA. Generated clocks are output via
the SYNCB and BICKB pins.
AK4675
Phone Module
BICKA
SDTOA
SDTIA
SYNCB
SDTI
SDTO
SYNC
SYNCA
1fs2
≥
16fs2
BICK
BICKB
SDTOB
SDTIB
SDTI
SDTO
1fs2
16fs2 or 32fs2
BICK
SYNC
Bluetooth Module
Figure 89. PCM I/F (PLLBT Reference Clock: SYNCA or BICKA pin)
b) PLLBT reference clock: SYNCB or BICKB pin
The PLLBT circuit generates the required clock for PCM I/F from SYNCB or BICKB. Generated clocks are output via
the SYNCA and BICKA pins.
AK4675
Phone Module
BICKA
SDTOA
SDTIA
SYNCB
SDTI
SDTO
SYNC
SYNCA
1fs2
16fs2 or 32fs2
BICK
BICKB
SDTOB
SDTIB
SDTI
SDTO
1fs2
≥
16fs2
BICK
SYNC
Bluetooth Module
Figure 90. PCM I/F (PLLBT Reference Clock: SYNCB or BICKB pin)
PLLBT should always be powered-up (PMPCM bit = “1”) whenever SRC-A or SRC-B is in operation (PMSRA bit = “1”
or PMSRB bit = “1”). If PLLBT is powered-down, the AK4675 may draw excess current and it is not possible to operate
properly because utilizes dynamic refreshed logic internally. If PLLBT is powered-down, SRC-A and SRC-B should be
in the power-down mode (PMSRA=PMSRB bits = “0”).