CS4398-CZZR Cirrus Logic Inc, CS4398-CZZR Datasheet - Page 21

• Manufacturer Part Number: CS4398-CZZR
• Description: IC,D/A CONVERTER,DUAL,24-BIT,TSSOP,28PIN
• Manufacturer: Cirrus Logic Inc

DS568F1
4.4
4.5
Single-Speed
Double-Speed
Quad-Speed
*These modes are only available in Control Port mode by setting the appropriate MCLKDIV bit.
Use of the Mute Control function is not mandatory but recommended for designs requiring the absolute min-
imum in extraneous clicks and pops. Also, use of the Mute Control function can enable the system designer
to achieve idle channel noise/signal-to-noise ratios which are only limited by the external mute circuit.
Oversampling Modes
The CS4398 operates in one of three oversampling modes based on the input sample rate. 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.
Master and Serial Clock Ratios
The required MCLK-to-LRCK ratio and suggested SCLK-to-LRCK ratio are outlined in Table 1. MCLK can
be at any phase in regards to LRCK and SCLK. SCLK, LRCK and SDATA must meet the phase and timing
relationships outlined in Section 2. Some common MCLK frequencies have been outlined in Table 2.
256, 384, 512, 768*, 1024*, 1152*
128, 192, 256, 384, 512*
Figure 12. Recommended Mute Circuitry
MCLK/LRCK
128, 256*
192
64
96
Table 1. Clock Ratios
32, 48, 64, 96, 128
32 (16 bits only)
32, 48, 64, 96
SCLK/LRCK
32, 48, 64
32, 48
32, 64
LRCK
Fs
Fs
Fs
Fs
Fs
Fs
CS4398
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