TFA9812HN PHILIPS [NXP Semiconductors], TFA9812HN Datasheet - Page 14

• Manufacturer Part Number: TFA9812HN
• Description: BTL stereo Class-D audio amplifier with I2S input
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
TFA9812_2
Preliminary data sheet
8.3.2 Power-down
8.4.1 Digital audio data format support
8.4 Digital audio data input
In I
be made within 66 ms before the PLL starts running. Finally, the output stages are
enabled and the audio level is increased via a demute sequence if mute has previously
been disabled.
Remark: In I
I
is 0 dB) should be set before soft mute is disabled.
Remark: For a proper start-up in I
should be followed:
Figure 3
power-down.
Table 11.
Putting the TFA9812 into power-down is equivalent to enabling Sleep mode
(see
required.
In order to prevent audible clicks, soft mute should be enabled at least T
seconds before enabling Sleep mode.
The specified low current and power conditions in
enabling Sleep mode.
The TFA9812 supports a commonly used range of I
formats. These are listed in
Table 12.
Power-up pin
value
0
1
BCK frequency Interface format (MSB first)
32 f
32 f
32 f
48 f
48 f
2
1. The I
2. Next, another sample rate setting than the default one should be selected.
3. Finally, when the default sample rate is used the default sample rate setting should be
C communication is valid. In order to prevent audio clicks volume control (default setting
2
s
s
s
s
s
C control mode communication is enabled after 4 ms. The preferred I
selected again.
Section
includes the power-down timing while
2
S master setting should be set and keep the default sample rate setting active.
Power-up/power-down selection
Supported digital audio data formats
2
8.2.2). This mode is entered immediately and no additional clock cycles are
C mode soft mute is enabled by default. It can be disabled at any time while
I
MSB-justified 16-bit data
LSB-justified 16-bit data
I
MSB-justified up to 24-bit data
2
2
Description
Power-down (Sleep mode)
Power-up
S up to 16-bit data
S up to 24-bit data
Rev. 02 — 22 January 2009
Table
12.
2
S master mode and I
BTL stereo Class-D audio amplifier with I
Table 11
Supported in I
control mode
yes
yes
yes
yes
yes
Table 1
2
S and I
shows the pin control for enabling
2
C mode the following sequence
are valid within 10 s after
2
S-like digital audio data input
2
C
Supported in Legacy
control mode
yes
yes
yes
yes
yes
© NXP B.V. 2009. All rights reserved.
TFA9812
d(soft_mute)
2
C settings can
2
S input
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