AK4456 Datasheet, PDF (30/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz Advanced 32-bit DAC

[AK4456]
■ Audio Interface Format
The AK4456 supports both PCM and DSD formats for digital input signal. Mode settings are available by the
pins (TDM1-0 pins, DIF pin and DCHAIN pin) and registers (TDM1-0 bits, DIF2-0 bits, SDS2-0 bits and
DCHAIN bit). The RSTN bit should be toggled in case these format setting bits are changed during operation.
[1] PCM Mode
Normal Mode (TDM1-0 bits=“00”)
Six channels audio data is shifted in via the SDTI1-3 pins using BICK and LRCK inputs. Data is selected by
SDS2-0 bits. Eight data formats are supported and selected by the DIF2-0 bits as shown in Table 13. In all
formats the serial data is MSB first, 2's compliment format and is latched on the rising edge of BICK. Mode 2
can be used in 16-bit and 20-bit MSB justified and Mode 6 can be used in 16-bit, 20-bit and 24-bit MSB
justified formats by zeroing the unused LSBs.
TDM128 Mode (TDM1-0 bits=“01”)
Six channels audio data is shifted in via the SDTI1-2 pins using BICK and LRCK inputs. Data is selected by
SDS2-0 bits. The data input to the SDTI3 pins are ignored. BICK is fixed to 128fs. Six data formats are
supported and selected by the DIF2-0 bits as shown in Table 13. In all formats the serial data is MSB first, 2's
compliment format and is latched on the rising edge of BICK.
TDM256 Mode (TDM1-0 bits=“10”)
Sixteen channels audio data is shifted in via the SDTI1-2 pins using BICK and LRCK inputs. Data is selected
by SDS2-0 bits. The data input to the SDTI3 pins are ignored. BICK is fixed to 256fs. Six data formats are
supported and selected by the DIF2-0 bits as shown in Table 13. In all formats the serial data is MSB first, 2's
compliment format and is latched on the rising edge of BICK.
TDM512 Mode (TDM1-0 bits=“11”)
Sixteen channels audio data is shifted in via the SDTI1 pin using BICK and LRCK inputs. Data is selected by
SDS2-0 bits. The data input to the SDTI2-3 pins are ignored. BICK is fixed to 512fs. Six data formats are
supported and selected by the DIF2-0 bits as shown in Table 13. In all formats the serial data is MSB first, 2's
compliment format and is latched on the rising edge of BICK.
015006886-E-00
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2015/06