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)： 11/66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
19 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
(7)
(8)
In Equation 8, M is the unsigned mantissa and E the negative signed exponent. For
example, in word2 bits [14:8] = [0111 010] represent k2' = (7/24) × 22 = 1.09375 101.
Section 9.5.4 shows the I2C address locations of the controls for various bands of the
equalizer.
Table 15.
Equalizer control word construction
Word
Section
Data
word1
15
t1
word1
[14:4]
11 mantissa bits of k1’
word1
[3:0]
Four exponent bits of k1’
word2
15
t2
word2
[14:11]
Four mantissa bits of k2’
word2
[10:8]
Three exponents bits of k2’
word2
[7:1]
k0
word2
0
s
Fig 6.
Transfer functions for several quality factors Q
k
1′
1k
1
–
t
1
=
1k
1
+
t
1
0
=
=
k
2′
1k
2
–
t
2
0
=
1k
2
+
t
2
1
=
=
k
x
M2
E
–
M1
<
=
010aaa222
4
8
12
Gain
(dB)
0
Frequency (Hz)
101
105
104
102
103
Q1 = 0.27
Q2 = 0.61
Q3 = 1.65
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