參數(shù)資料
型號： TFA9812HN/N1,557
廠商： NXP SEMICONDUCTORS
元件分類： 音頻／視頻放大
英文描述： 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
封裝： 7 X 7 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT619-8, HVQFN-48
文件頁數(shù)： 8/66頁
文件大?。?/td> 386K
代理商： TFA9812HN/N1,557
TFA9812_2
NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
16 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
In I2C control mode the following sample frequency fs can be used: 8 kHz, 11.025 kHz,
12 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 64 kHz, 88.2 kHz, 96 kHz,
128 kHz, 176.4 kHz or 192 kHz. The I2C control for fs selection can be found in
In Legacy control mode the following sample frequencies (fs) can be used: 32 kHz,
44.1 kHz or 48 kHz.
8.4.2 Digital audio data format control
The BCK-to-WS and MCLK-to-WS frequency ratios are automatically detected, so no
control settings need to be congured for these.
In I2C control mode all the formats listed in Table 12 are supported. The appropriate I2C
controls for selecting the supported formats can be found in Section 9. In the Legacy
control mode only a subset of the supported formats can be used. These are shown in
Table 12 and the required pin control is given in Table 13.
See Section 8.2.1 for details of how to enable Legacy control mode.
8.5 Digital signal-processing features
8.5.1 Equalizer
8.5.1.1
Equalizer options
The equalizer function can be bypassed and the equalizer can be congured to either a
5-band or 10-band function. These settings are for both audio channels simultaneously.
There are 20 bands in the equalizer. These are distributed as follows:
Bands A1 to A5 are bands 1 to 5 of output 1 (used in 5-band and 10-band
conguration).
Bands B1 to B5 are bands 1 to 5 of output 2 (used in 5-band and 10-band
conguration).
Bands C1 to C5 are bands 6 to 10 of output 1 (used in 10-band conguration only).
Bands D1 to D5 are bands 6 to 10 of output 2 (used in 10-band conguration only).
In I2C control mode each band can be congured separately using I2C register settings.
In Legacy control mode the equalizer is bypassed.
8.5.1.2
Equalizer band function
The shape of each parametric equalizer band is determined by the three lter parameters:
(Relative) center frequency
.
Quality factor Q.
Gain factor G.
Table 13.
Digital audio data format selection in Legacy control mode
SCL/SFOR pin value
Interface formats (MSB-rst)
0I2S
1
MSB-justied
ω
2
π f
c
f
s
()
=
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