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| 型號(hào)： | TFA9812HN/N1,557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 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(yè)數(shù)： | 9/66頁(yè) |
| 文件大小： | 386K |
| 代理商： | TFA9812HN/N1,557 |
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TFA9812_2
NXP B.V. 2009. All rights reserved.
Preliminary data sheet
Rev. 02 — 22 January 2009
17 of 66
NXP Semiconductors
TFA9812
BTL stereo Class-D audio amplier with I2S input
In the above equation fc is the center frequency and fs is the sample frequency.
The denition of the quality factor is the center frequency divided by the 3 dB bandwidth,
see Equation 1. In parametric equalizers this is only valid when the gain is set very small
(
30 dB).
(1)
Each band lter can be programmed to perform a band-suppression (G < 1) or a
band-amplication (G > 1) function around the center frequency.
Each band of the TFA9812 equalizer has a second-order Regalia-Mitra all-pass lter
structure. The structure is shown in Figure 5.
The transfer function of this all-pass lter is shown in Equation 2:
(2)
A(z) is the second-order lter structure. The transfer function of A(z) is shown in
(3)
The relationship between the programmable parameters K0, K1, and K2 and the lter
parameters G,
ω, Q is shown in Equation 4 and Equation 5.
Use Equation 4 to calculate band suppression (G < 1) functions.
(4)
Use Equation 5 to calculate band amplication (G
≥ 1) functions.
Fig 5.
Regalia lter ow-diagram
Q
f
c
f
2
f
1
–
-----------------;
=
f
1:
20
10
A
f
1
A
f
c
--------
log
3dB f
c
f
1
>
=
f
2:
20
10
A
f
2
A
f
c
--------
log
3dB f
2
f
c
>
,
=
X(z)
A(z)
s
Y(z)
+
010aaa406
K0/2
Hz
()
12
1A z
()
+
() K
0 2
1A z
()
–
()
+
=
Az
()
K
1
K
2
1K
1
+
() Z
1
–
Z
2
–
+
+
1K
2
1K
1
+
() Z
1
–
K
1
Z
2
–
+
+
---------------------------------------------------------------------------------
=
K
0
G
=
K
1
ω
cos
–
=
K
2
2Q G
ω
sin
–
() 2Q G
ω
sin
+
()
=
G1
<
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