參數(shù)資料
型號： TFA9812HN/N1,518
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)： 10/66頁
文件大?。?/td> 386K
代理商： TFA9812HN/N1,518
TFA9812_2
NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
18 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
(5)
The ranges of the TFA9812 parametric equalizer settings for each band are:
The Gain, G is from
30 dB to +12 dB.
The center frequency, fc is from 0.0004 * fs to 0.49 * fs.
The quality factor Q is from 0.001 to 8.
Using I2C control, lter coefcients need to be entered for each lter stage to congure it
as desired.
Figure 6, Figure 7 and Figure 8 show some of the possible transfer functions of the
equalizer bands. The relations are symmetrical for the suppression and amplication
functions. A skewing effect can be observed for the higher frequencies.
Different congurations are available for the same lter transfer function, thus allowing
optimum numerical noise performance. The binary lter conguration parameters t1 and t2
control the actual conguration and should be chosen according to Equation 6.
(6)
A maximum of 12 dB amplication per equalizer stage can be achieved with respect to the
input signal. Each band of the equalizer is provided with a
6 dB amplication, so in order
to prevent numerical clipping for some lter settings with over 6 dB of amplication, band
lters can be scaled by 0 dB or
6 dB. For optimum numerical noise performance steps of
6 dB amplication should be applied to the highest possible sections that are still within
scale signal processing safeguards. Band lters can be scaled with the binary parameters
listed in Table 14.
8.5.1.3
Equalizer band control
For compact representation with positive signed parameters, parameters k1’ and k2’ are
introduced in Equation 7.
The parameters k0, k1', k2', t1, t2 and s must be combined in two 16-bit control words,
word1 and word2, and must t within the representation given in Table 15. Parameters k1'
and k2' are unsigned oating-point representations in Equation 8.
Table 14.
Equalizer scale factor coding
s
scale factor (dB)
00
1
6
K
0
G
=
K
1
ω
cos
–
=
K
2
2Q
ω
sin
–
() 2Q
ω
sin
+
()
=
G1
≥
t
1
0
ω<=π 2
1
ω>π 2
=
t
2
0k
2>=0
1k
2<0
=
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