CS4364_08 Datasheet, PDF (23/50 Pages) Cirrus Logic – 103 dB, 192 kHz 6-Channel D/A Converter

CS4364
LRCK
SCLK
Left Channel
Right Channel
SDINx 1 0
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
32 _Fcl_io_gck_us_{re 13. Format 5 - Right-Justified 18-bit Data}
4.3.1 OLM #1
OLM #1 serial audio interface format operates in Single-, Double-, or Quad-Speed Mode and will slave to
SCLK at 128 Fs. Six channels of MSB first 20-bit PCM data are input on SDIN1.
LRCK
64 clks
Left Channel
64 clks
Right Channel
SCLK
SDIN1
MSB
LSB MSB
LSB MSB
LSB
DAC_A1
DAC_A2
DAC_A3
20 clks
20 clks
20 clks
MSB
LSB MSB
LSB MSB
LSB
DAC_B1
DAC_B2
DAC_B3
20 clks
20 clks
20 clks
MSB
Figure 14. Format 8 - One Line Mode 1
4.3.2 OLM #2
OLM #2 serial audio interface format operates in Single-, Double-, or Quad-Speed Mode and will slave to
SCLK at 256 Fs. Six channels of MSB first 24-bit PCM data are input on SDIN1.
LRCK
SCLK
SDIN1
128 clks
Left Channel
MSB
LSB MSB
LSB MSB
LSB
DAC_A1
DAC_A2
DAC_A3
24 clks
24 clks
24 clks
128 clks
Right Channel
MSB
LSB MSB
LSB MSB
LSB
DAC_B1
DAC_B2
DAC_B3
24 clks
24 clks
24 clks
MSB
Figure 15. Format 9 - One Line Mode 2
4.4 Oversampling Modes
The CS4364 operates in one of three oversampling modes based on the input sample rate. Mode selection
is determined by the M4, M3 and M2 pins in Hardware Mode or the FM bits in Software Mode. Single-Speed
Mode supports input sample rates up to 50 kHz and uses a 128x oversampling ratio. Double-Speed Mode
supports input sample rates up to 100 kHz and uses an oversampling ratio of 64x. Quad-Speed Mode sup-
ports input sample rates up to 200 kHz and uses an oversampling ratio of 32x.
The auto speed-mode detect feature allows for the automatic selection of speed mode based off of the in-
coming sample rate. This allows the CS4364 to accept a wide range of sample rates with no external inter-
vention necessary. The auto speed-mode detect feature is available in both Hardware and Software Mode.
DS619F1
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