tfa9879hn NXP Semiconductors, tfa9879hn Datasheet - Page 13
tfa9879hn
Manufacturer Part Number
tfa9879hn
Description
Mono Btl Class-d Audio Amplifier For Portable Applications With Digital Input
Manufacturer
NXP Semiconductors
Datasheet
1.TFA9879HN.pdf
(60 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
tfa9879hn/N1
Manufacturer:
ALTERA
Quantity:
332
Part Number:
tfa9879hn/N1,118
Manufacturer:
NXP/恩智浦
Quantity:
20 000
NXP Semiconductors
TFA9879_1
Preliminary data sheet
The transfer function of this all-pass filter is given in
A(z) is the second order filter structure. The transfer function of A(z) is given in
Equation
Z
K
Equation 5
Equation 6
The ranges of the parametric equalizer settings for each band are:
Filter coefficients need to be entered for each filter stage via the I
configure the filters (see
Figure
The relationships are symmetrical for the suppression and amplification functions. A
skewing effect can be observed at higher frequencies.
H z
A z
K
K
Fig 6.
1
0
•
•
•
2
2
, K
equals one f
=
=
The gain, G, is from 30 dB to +12 dB.
The center frequency, f
The quality factor, Q, is from 0.001 to 8.
1
=
=
and K
2Q G
2Q
7,
------------------------------------------------------------------------------ -
1
1 2
K
Figure 8
Regalia-Mitra filter flow diagram
4:
K
+
–
X(z)
1
1
can be used to calculate band suppression (G < 1) functions.
can be used to calculate band amplification (G 1) functions.
K
K
+
2
sin
K
2
=
0
–
and the filter parameters G, and Q is shown in
K
1
1
K
=
–
s
All information provided in this document is subject to legal disclaimers.
sin
2
s
+
=
1
0
cos
delay period. The relationship between the programmable parameters
G
A z
+
and
=
–
1
K
cos
2Q
+
G
1
Figure 9
Z
K
2Q G
+
Rev. 01 — 8 April 2010
+
1
A(z)
Section
Z
K
sin
1 –
c
0
, is from 0.0004 ´ f
2
+
1 –
+
K
+
illustrate some possible equalizer band transfer functions.
G 1
+
1
sin
10.4.3).
1 A z
Z
Mono BTL class-D audio amplifier with digital input
2 –
Z
–
2 –
−
G 1
+
+
s
½
to 0.49 ´ f
K
Equation
0
/2
s
.
3:
Equation 5
2
C-bus interface to
TFA9879
© NXP B.V. 2010. All rights reserved.
010aaa406
and
Y(z)
Equation
13 of 60
(3)
(4)
(5)
(6)
6.