WM8726 Wolfson Microelectronics plc, WM8726 Datasheet - Page 14

• Manufacturer Part Number: WM8726
• Description: 24-bit 192khz Stereo Dac
• Manufacturer: Wolfson Microelectronics plc

WM8726
AUDIO DATA SAMPLING RATES
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Figure 8 DSP Mode A Timing
Figure 9 DSP Mode B Timing
The master clock for WM8726 supports audio sampling rates from 128fs to 768fs, where fs is the
audio sampling frequency (LRCIN) typically 32kHz, 44.1kHz, 48kHz, 96kHz or 192kHz. The
master clock is used to operate the digital filters and the noise shaping circuits.
The WM8726 has a master clock detection circuit that automatically determines the relation
between the master clock frequency and the sampling rate (to within +/- 8 master clocks). If there
is a greater than 8 clocks error, the interface shuts down the DAC and mutes the output. The
master clock should be synchronised with LRCIN, although the WM8726 is tolerant of phase
differences or jitter on this clock.
Table 1 Master Clock Frequencies Versus Sampling Rate
SAMPLING
LRCIN
LRCIN
BCKIN
44.1kHz
BCKIN
(LRCIN)
192kHz
DIN
DIN
32kHz
48kHz
96kHz
RATE
MSB
1
Input Word Length (16 bits)
max 4 BCKIN's
Max 4 BCKIN's
MSB
1
Input Word Length (16 bits)
LEFT CHANNEL
2
1 BCKIN
5.6448
24.576
12.288
4.096
6.144
128fs
LEFT CHANNEL
2
15
LSB
15
16
LSB
16
1
18.432
36.864
6.144
8.467
9.216
MASTER CLOCK FREQUENCY (MHZ) (MCLK)
192fs
RIGHT CHANNEL
1
2
RIGHT CHANNEL
2
Unavailable
15
11.2896
12.288
24.576
15
8.192
256fs
16
16
1/fs
1/fs
Unavailable
16.9344
12.288
18.432
36.864
384fs
NO VALID DATA
NO VALID DATA
Unavailable
Unavailable
22.5792
16.384
24.576
512fs
PD Rev 4.6 May 2008
Production Data
1 BCKIN
Unavailable
Unavailable
33.8688
24.576
36.864
768fs
1
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