TDA7437N datasheet(27/34 Pages) STMICROELECTRONICS

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TDA7437N

Mute and pause features

27/34

5.13

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

5.14

Input selector

The multiplexer selector can choose one of the following inputs:

●

a differential CD stereo input.

●

a mono input.

●

four stereo input

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.

R1 R2 C1 C2

⋅⋅

⋅

⋅⋅

------------------------------------------------------------------

R2 C2

R2 C1

R1 C1

⋅

R2 C1

R2 C2

⋅

--------------------------------------------------------------------------

–

Π R1 Q

⋅⋅

⋅

----------------------------------

QQ C1

⋅⋅

–

⋅

–

-----------------------------------

R1 R2 C1 C2

⋅⋅

⋅

()

R2 C1

R2 C2

⋅

------------------------------------------------------

–

⋅

–

Π C1 F

–

() Q

⋅⋅

⋅

----------------------------------------------------------------------

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