[AK4492]
(3)-2. TDM256 Mode
Figure 45 shows daisy chain connection in TDM256 mode (TDM[1:0] bits = “10”). 8ch data is input to the
SDATA pin of the second AK4492 and the TDMO pin of the second AK4492 is connected to the SDATA
pin of the first AK4492.
Figure 47 shows data input/output example of daisy chain in TDM256 mode. The second AK4492
receives L4 and R4 data as DAC inputs and outputs the data from the TDMO pin by shifting 2ch. The first
AK4492 receives L3 and R3 data as DAC input. Settings of DIF[2:0] bits of the first and second AK4492’s
must be the same.
256 BICK
LRCK
L1
L4
R1
R4
L2
L1
R2
L3
L2
R3
R2
L4
R4
SDATA
Second AK4492
R1
L3
R3
TDMO
First AK4492
Figure 47. Daisy Chain (TDM256 Mode)
[2] DSD Mode
In DSD mode, L channel data and R channel data must be input to the DSDL pin and the DSDR pin,
respectively by synchronizing to DCLK. Input pins can be selected by DSDPATH bit. When DSDPATH bit
= “0”, the TDM0 pin, the DEM pin and the GAIN pin become DCLK, DSDL and DSDR input pins,
respectively. When DSDPATH bit = “1”, the BICK pin, the SDATA pin and the LRCK pin become DCLK,
DSDL and DSDR input pins, respectively.
In case of DSD mode, the settings of DIF2-0 pins and DIF[2:0] bits are ignored. The frequency of DCLK is
selected between 64fs, 128fs and 256fs by DSDSEL[1:0] bits.
Polarity of DCLK is possible to reverse at DCKB bit.
DCLK (64fs,128fs,256fs)
DCKB bit=”1”
DCLK (64fs,128fs,256fs)
DCKB bit=”0”
DSDL,DSDR
D0
D0
D1
D2
D3
D3
Normal
DSDL,DSDR
D1
D2
D1
D2
Phase Modulation
Figure 48. DSD Mode Timing
016011073-E-00
2016/12
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AKM [ ASAHI KASEI MICROSYSTEMS ]
