AK5572 Datasheet, PDF (46/68 Pages) Asahi Kasei Microsystems – 2-Channel Differential 32-bit ADC

[AK5572]
■ Channel Summation (PCM mode, DSD mode)
Channel Summation function improves the dynamic range and S/N performance by averaging all A/D
data of multiple-channel that the same signal is input. The AK5572 supports 2-to-1 mode.
2-to-1 mode (Mono mode)
Improve the dynamic range and S/N for 3 dB (1.5 dB in DSD mode) by averaging two channels.
Not-Summation mode (Stereo mode)
Normal mode that does not execute Summation is called as Not-Summation mode or Stereo mode.
Refer to the section “CH Power Down & Channel Summation mode” for details.
■ Optimal Data Placement Mode (PCM Mode, DSD Mode)
Assigned data to the SDTO1 slot is controlled by the ODP pin setting in parallel control mode.
When the ODP pin = “L”, the data is output by Fixed Data Placement mode. Channel assignment of data
slot is fixed regardless of enable/disenable of channel summation. For example, averaging data of two
channels are output to both channel slots.
When the ODP pin = “H”, the data is output by Optimal Data Placement mode that is uses data slot more
efficiently. In Optimal Data Placement mode, there are no data redundant of channel summation, and the
data is output in MSB justified. Therefore, the maximum number of connecting device in cascade
connection will be increased. If the AK5572 is set to 2-to-1 mode (Mono Mode), four devices can be
connected in TDM128 mode, eight devices can be connected in TDM256 mode and sixteen devices can
be connected in TDM512 mode.
In serial control mode, the data output is Optimal Data Placement mode regardless of the ODP pin
setting.
Refer to “CH Power Down & Channel Summation mode” for details.
■ CH Power Down & Channel Summation (PCM mode, DSD mode)
[1] Parallel mode
The setting of the PW2-0 pins and the ODP pin controls the channel power-down and channel
summation mode setting in parallel mode (Table 11 - Table 16). The PDN pin must be set to “L” when
changing the ODP pin and the PW2-0 pins. The power consumption of the device can be improved by
setting unused channels to power-down state. In this case, the channel circuit that is powered down will
be reset.
When the ODP pin = “L”, the PW2-0 pins control channel power-down and 2-to-1 mode.
In 2-to-1 mode, AIN1 and AIN2 channel data are summed digitally and output from the SDTO1 (DSDOL1
and DSDOR1) by dividing into half amplitude.
015016766-E-00
- 46 -
2015/12