ak4644 AKM Semiconductor, Inc., ak4644 Datasheet - Page 27

• Manufacturer Part Number: ak4644
• Description: Stereo Codec With Mic/hp/rcv-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
A reference clock of PLL is selected among the input clocks to MCKI, BICK or LRCK pin. The required clock to the
AK4644 is generated by an internal PLL circuit. Input frequency is selected by PLL3-0 bits (see Table 5).
a) PLL reference clock: MCKI pin
BICK and LRCK inputs should be synchronized with MCKO output. The phase between MCKO and LRCK dose not
matter. MCKO pin outputs the frequency selected by PS1-0 bits (see Table 10) and the output is enabled by MCKO bit.
Sampling frequency can be selected by FS3-0 bits (see Table 6)
MS0477-E-01
PLL Slave Mode (AIN3 bit = “0”, PMPLL bit = “1”, M/S bit = “0”)
Figure 20. PLL Slave Mode 1 (PLL Reference Clock: MCKI pin)
AK4644
MCKI
MCKO
BICK
LRCK
SDTO
SDTI
256fs/128fs/64fs/32fs
≥ 32fs
1fs
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11.2896MHz, 12MHz, 12.288MHz
13.5MHz, 24MHz, 27MHz
MCLK
BCLK
LRCK
SDTI
SDTO
DSP or µP
[AK4644]
2006/10