[AK4438]
■ Audio Interface Format
TDM1-0 bits, DIF2-0 bits, SDS2-0 bits, TDM1-0 pins and DIF pin settings should not be changed during
operation.
[1] PCM Mode
Normal Mode (TDM1-0 bit=“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 9. 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 bit=“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 9. 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 bit=“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 9. 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 bit=“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 9. In all formats the serial data is MSB
first, 2's compliment format and is latched on the rising edge of BICK.
016001925-E-00
2016/03
- 25 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
