CS42448-CQZR Cirrus Logic Inc, CS42448-CQZR Datasheet - Page 30

• Manufacturer Part Number: CS42448-CQZR
• Description: IC,Soundcard Circuits,CMOS,QFP,64PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

30
4.4
Sample Rate
Sample Rate
Sample Rate
System Clocking
The CODEC (ADC & DAC) serial audio interface ports operate either as a slave or master. The serial ports
accept externally generated clocks in slave mode and will generate synchronous clocks derived from an in-
put master clock in master mode. In the TDM format the ADC and DAC serial ports will only operate as a
slave. In OLM #2 the serial ports will accept or output a 256Fs SCLK. See the registers
Mode (DAC_FM[1:0])” on page 43
master/slave mode.
The CODEC requires external generation of the master clock (MCLK). The frequency of this clock must be
an integer multiple of, and synchronous with, the system sample rate, Fs.
The required integer ratios, along with some common frequencies, are illustrated in tables
The frequency range of MCLK must be specified using the MFREQ bits in register
(MFREQ[2:0])” on page
(kHz)
(kHz)
(kHz)
176.4
De-emphasis is only available in Single-Speed Mode. Please see
(DAC_DEM)” on page 46
44.1
88.2
192
32
48
64
96
11.2896
12.2880
Table 3. Double-Speed Mode Common Frequencies
8.1920
Table 2. Single-Speed Mode Common Frequencies
11.2896
12.2880
11.2896
12.2880
256x
8.1920
Table 4. Quad-Speed Mode Common Frequencies
128x
64x
43.
for de-emphasis control.
Figure 14. De-Emphasis Curve
-10dB
Gain
0dB
and
dB
12.2880
16.9344
18.4320
12.2880
16.9344
18.4320
“ADC Functional Mode (ADC_FM[1:0])” on page 43
16.9344
18.4320
384x
192x
96x
3.183 kHz
T1=50 µs
F1
MCLK (MHz)
MCLK (MHz)
MCLK (MHz)
16.3840
22.5792
24.5760
16.3840
22.5792
24.5760
10.61 kHz
512x
256x
22.5792
24.5760
128x
F2
T2 = 15 µs
Frequency
24.5760
33.8688
36.8640
24.5760
33.8688
36.8640
768x
33.8688
36.8640
384x
“DAC De-Emphasis Control
192x
“MCLK Frequency
“DAC Functional
Tables 2
for setting up
CS42448
32.7680
45.1584
49.1520
32.7680
45.1584
49.1520
45.1584
49.1520
1024x
512x
256x
DS648F3
to 4.