CS42426
4.5.2
Serial Audio Interface Formats
The DAC_SP and ADC_SP digital audio serial ports support five formats with varying bit depths from 16
to 24 as shown in Figures 11 to 15. These formats are selected using the configuration bits in the registers,
“Functional Mode (address 03h)” on page 43 and “Interface Formats (address 04h)” on page 45. For the
diagrams below, Single-Speed Mode is equivalent to Fs = 32, 44.1, 48 kHz; Double-Speed Mode is for
Fs = 64, 88.2, 96 kHz; and Quad-Speed Mode is for Fs = 176.4, 196 kHz.
DAC_LRCK
ADC_LRCK
Right Channel
Left Channel
DAC_SCLK
ADC_SCLK
DAC_SDINx
ADC_SDOUT
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Right-Justified Mode, Data Valid on Rising Edge of SCLK
Bits/Sample
SCLK Rate(s)
Notes
Master
Slave
64 Fs
64 Fs
64 Fs
48, 64, 128 Fs
64 Fs
Single-Speed Mode
16
24
Double-Speed Mode
Quad-Speed Mode
Single-Speed Mode
Double-Speed Mode
Quad-Speed Mode
64 Fs
64, 128, 256 Fs
64 Fs
64, 128 Fs
64 Fs
64 Fs
64 Fs
Figure 11. Right-Justified Serial Audio Formats
DS604F1
27
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