AK4458VN Datasheet, PDF (30/83 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 8ch Premium DAC

[AK4458]
■ Audio Interface Format
The AK4458 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) but do not change these settings during operation.
[1] PCM Mode
Normal Mode (TDM1-0 bits=“00”)
Eight channels audio data is shifted in via the SDTI1-4 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 clocked in 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”)
Eight 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 SDTI3-4 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 clocked in 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 SDTI3-4 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 clocked in 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 SDTI2-4 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 clocked in on the rising edge of BICK.
014011794-E-00
- 30 -
2015/01