参数资料
型号: TFA9812HN
厂商: NXP SEMICONDUCTORS
元件分类: 音频/视频放大
英文描述: 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
封装: 7 X 7 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT619-8, HVQFN-48
文件页数: 11/66页
文件大小: 386K
代理商: TFA9812HN
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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