AK7714 Datasheet, PDF (26/48 Pages) Asahi Kasei Microsystems – 20-Bit Audio Codec with DSP and Delay RAM

[ASAHI KASEI]
[AK7714]
1) Master clock (XTI pin)
The master clock is obtained by connecting a crystal oscillator between the XTI pin and XTO pin or by inputting an
external clock into the XTI pin while the XTO pin is open.
CLKO outputs a clock having the same frequency as the XTI. (The phase is different. Also, the phase difference varies
slightly according to the product. When a crystal oscillator is used, the same frequency is obtained after the oscillation
of the crystal oscillator has settled.)
In the AK7714, CLKO will be output when power is turned on and oscillation has occurred.
If CLKO is not required, set to CTRL1 = "H".
2) Slave mode
The required system clock is XTI (256 fs/384 fs/512 fs), LRCLK (1 fs) and BITCLK (48/64 fs).
The master clock (XTI) and LRCLK must be synchronized, but the phase does not have to be adjusted.
3) Master mode
The required system clock is XTI (256 fs/384 fs/512 fs). When the master clock (XTI) is input, LRCLK (1 fs) and BITCLK
(64 fs) will be output from the internal counter synchronized with the XTI. (CTRL0 = "L" during normal operation.)
LRCLK and BITCLK will not be output during initial reset (INIT RESET = "L") and system reset
(DSP RESET = CODEC RESET = "L").
M0018-E-00
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‘98/07