[AK4129]
(1) Master Mode
The OLRCK pin and OBICK pin are output pins in master mode. Master clock is supplied from the OMCLK/XTI pin. The
clock for the OMCLK/XTI pin can be generated by the following methods: Connect a crystal oscillator between the
OMCLK/XTI and XTO pins, or input a clock to the OMCLK/XTI pin. In bypass mode, the MCKO pin outputs IMCLK
data.
a. X’tal
The OMCLK/XTI pin
is pulled down when
the PDN pin= “L”.
XTI
C
460kΩ (typ)
C
XTO
AK4129
Note: Refer to Table 5 for the capacitor and resistor values of the X’tal oscillator.
Figure 21. X’tal Mode
Nominal Frequency [MHz]
Equivalent Series Resistance R1[Ω] max
External Capacitance C[pF] max
11.2896
12.288
60
15
24.576
Table 5. Equivalent Series Resistor and External Capacitor for External X’tal Oscillator
In X’tal mode at 256FSO OMCLK input, FSO ranges from 44.1kHz to 96kHz.
In X’tal mode at 384FSO OMCLK input, FSO ranges from 29.4kHz to 64kHz.
In X’tal mode at 512FSO OMCLK input, FSO ranges from 22.05kHz to 48kHz.
In X’tal mode at 768FSO OMCLK input, FSO ranges from 14.7kHz to 32kHz.
In X’tal mode at 128FSO OMCLK input, FSO ranges from 88.2kHz to 192kHz.
b. External Clcok
- Note: Do not input the clock over DVDD1-4.
XTI
External
Clock
460kΩ (typ)
XTO
AK4129
Figure 22. External Clock (OMCLK) mode
(2) Slave Mode
The OLRCK pin and OBICK pin are input pins in slave mode.
MS1173-E-01
2010/09
- 24 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
