E-TDA7437N STMicroelectronics, E-TDA7437N Datasheet - Page 27

• Manufacturer Part Number: E-TDA7437N
• Description: Multimedia Misc CNTRL audio PROCESSR
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of E-TDA7437N

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-44
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7437N
5.13
5.14
Bass & mid filters
Several bass filter types can be implemented. Normally it is the basic T-type bandpass filter
that is used. Starting from the filter component values (R1 internal and R2, C1, C2 external),
the centre frequency Fc, the gain Av at max bass boost and the filter Q factor are computed
as follows:
Vice versa fixed Fc, Av, and R1 (internal typ.±30%), the external component values are
Input selector
The multiplexer selector can choose one of the following inputs:
●
●
●
The signal fed to the input pins must be decoupled via series capacitors. The minimum
allowed value depends on the correspondent input impedance. For the CD diff input (Zi =
10Kohm worst case) a Cin = 4.7uF is recommended. For the other inputs (70Kohm worst
case, a Cin=1uF is recommended.
a differential CD stereo input.
a mono input.
four stereo input
A
R2
F
v
c
=
Q
=
=
R2 C2
------------------------------------------------------------------------- -
C2
=
--------------------------------------------------------------------- -
2 Π C1 F
C1
----------------------------------------------------------------- -
2 Π
⋅
⋅
----------------------------------------------------- -
⋅
R2 C1
(
=
R2 C1
=
R1 R2 C1 C2
⋅
⋅
-----------------------------------
A
A
--------------------------------- -
2 Π R1 Q
⋅
+
⋅
v
v
Q Q C1
R1 R2 C1 C2
⋅
⋅
R2 C1
–
–
⋅
A
⋅
1
1
v
⋅
+
⋅
1
+
c
⋅
–
⋅
–
–
R2 C2
⋅
⋅
R2 C2
Q Q
Q Q
1
(
A
⋅
⋅
⋅
⋅
+
⋅
v
⋅
⋅
R1 C1
–
1
⋅
)
) Q
⋅
⋅
Mute and pause features
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