AK5374 Datasheet, PDF (15/51 Pages) Asahi Kasei Microsystems – 24-bit Stereo ADC with USB Interface

[AK5374]
■ Digital High Pass Filter
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 0.93Hz at
fs=48kHz. The digital high pass filter cut-off frequency scales with the sampling rate (fs). The HPF is always enabled.
■ Audio Data Format
The AK5374 supports 8bit, 16bit and 24bit audio data format and outputs LSB first to USB bus.
1) 8bit mono data format on the USB
Sample #
#1
#2
#3
···
mono
mono
mono
···
8 bit
8bit
8 bit
···
bit position
0-7
0-7
0-7
···
Table 4. Audio Data Format for 8bit mono
2) 16bit stereo data format on the USB
Sample #
#1
#2
···
L-ch data
R-ch data
L-ch data
R-ch data
···
Lower Upper Lower Upper Lower Upper Lower Upper
8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8bit 8 bit
···
bit position 0-7 8-15 0-7 8-15 0-7 8-15 0-7 8-15 ···
Table 5. Audio Data Format for 16bit stereo
3) 24bit stereo data format on the USB
Sample #
#1
#2
···
L-ch data
R-ch data
L-ch data
R-ch data
···
Lower Middle Upper Lower Middle Upper Lower Middle Upper Lower Middle Upper ···
8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8 bit 8 bit
bit position 0-7 8-15 16-23 0-7 8-15 16-23 0-7 8-15 16-23 0-7 8-15 16-23 ···
Table 6. Audio Data Format for 24bit stereo
MS1197-E-00
- 15 -
2010/05