AK7746 Datasheet, PDF (23/62 Pages) Asahi Kasei Microsystems – Audio DSP with 5-channel 24-bit ADC and Input Mux

[ASAHI KASEI]
[AK7746]
CLK Mode 2S is used when BITCLK_I is used instead of XTI. Do NOT forget to set SMODE=”L” , when using this mode. CLK
Mode 2M can be used when SMODE= “H”, however, it cannot be used with the crystal oscillator.
When CKS1 or CKS0 settings are changed after power up, (including changing between CLK mode 2S and CLK mode 2M), it must
be done during the initial reset state ( INIT_RESET =”L” and S_RESET =”L”). The CKS1 and the CKS0 pins control the PLL and
the internal clock control circuits, therefore an erroneous operation may occur if any pin settings change during the run time of the
AK7746. Changing the frequency of the XTI pin should be done at the initial reset state. The sampling rate is set by the control
register. (The CLK mode 2S is valid only for 44.1kHz and 48kHz fs mode. )
1-3) Source of the master clock
a) XTI select
Clocks can be supplied to the AK7746’s XTI pin as follows:
* When CLK mode 0 or 1 is used, either connect a proper crystal oscillator between XTI and XTO pins or supply a clock
of proper frequency to the XTI pin.
* When CLK mode 2M is used, supply a clock of proper frequency to the XTI pin.
XTI
XTO
AK7746
Fig.8-2 Using X’tal : CLK mode 0,1
XTI
External Clock
XTO
AK7746
Fig.8-3 Using external clock : CLK mode 0,1,2M
[MS0369-E00]
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2004/12