NXP Semiconductors TFA9812 - Manual (Page 11)

TFA9812_2 © NXP B.V. 2009. All rights reserved.
Preliminary data sheet Rev. 02 — 22 January 2009 11 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplifier with I 2 S input
[1] Under these conditions the mode is enabled by the appropriate I 2 C setting.
In I 2 S slave mode selection between BCK and MCLK clock modes is automatic.
MCLK clock mode is given higher priority than BCK. If the MCLK clock is judged valid by
the protection circuit then MCLK clock mode is enabled. BCK clock mode is enabled when
the MCLK clock is invalid (e.g. not available) and the BCK clock is judged valid by the
protection circuit (see
Section 8.7.11 ).
Table 7 shows the supported crystal frequencies in I 2 S master mode.
Table 8 shows the supported MCLK frequencies in MCLK mode (I 2 S slave mode).
Table 9 shows the supported BCK frequencies in BCK mode (I 2 S slave mode).
Table 6. I 2 S master/slave mode selection
Pin value Clock mode I 2 S mode
CSEL SDA/MS
0 0 legacy slave
0 1 legacy master
1 - I 2 C slave or master [1]
Table 7. Valid crystal frequencies in I 2 S master mode
Control mode f
s
(kHz) Crystal frequency (MHz)
I 2 C 8, 16, 32, 64, 128 8.192
11.025, 22.05, 44.1, 88.2,
176.4 11.2896
12, 24, 48, 96, 192 12.288
Legacy 32 8.192
44.1 11.2896
48 12.288
Table 8. Valid MCLK frequencies in I 2 S slave mode
Control mode f
s
(kHz) MLCK frequency (MHz)
I 2 C 8, 16, 32, 64, 128 8.192
12.288
32 18.432 (576 f
s
)
11.025, 22.05, 44.1, 88.2,
176.4 11.2896
16.9344
44.1 25.4016 (576 f
s
)
12, 24, 48, 96, 192 12.288
18.432
48 27.648 (576 f
s
)