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TDA7405

EQUALIZER CARRADIO SIGNAL PROCESSOR

STMicroelectronics 

TDA7405

5 DESCRIPTION OF THE AUDIOPROCESSOR PART

5.1 Input stages

In the basic configuration two full-differential, two mono-differential, one single ended stereo and one single-

ended mono input are available. In addition a dedicated input for the stereodecoder MPX-signal is present.

Figure 5. Input stages

5.1.1 Full-differential stereo Input 1 (FD1)

The FD1-input is implemented as a buffered full-differential stereo stage with 100kΩ input-impedance at each

input. The attenuation is programmable in 3 steps from 0 to -12dB in order to adapt the incoming signal level.

A 6dB attenuation is included in the differential stage, the additional 6dB are done by a following resistive divid-

er. This input is also configurable as two single-ended stereo inputs (see pin-out).

5.1.2 Full-differential stereo Input 2 (FD2)

The FD2-input has the same general structure as FD1, but with a programmable attenuation of 0 or 6dB em-

bedded in the differential stage.

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