E-TDA7461NDTR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

E-TDA7461NDTR

Car radio signal processor

STMicroelectronics 

Description of the audio processor part

TDA7461

If bit D3 byte 10 (Stdec Register) is set to 0, then the stdec signal will be always available at

the Mux out pins, no matter which is the selected source.

The selection of the stereodecoder input, via a special procedure, is recommended.

1. Soft Mute or Mute the signal path

2. Temporary deselect the stereodec

3. Wait 100-200 ms to allow the stdec internal filters to settle

4. Select sterodec input (with automatic autozero)

This procedure guarantees an optimum offsetcancellation, avoiding big DC offsets due to

the autozero circuitry, which otherwise could try to compensate the signal sourced at the

MPX input instead of the stereodecoder intrinsic offset.

3.3

3.3.1

Mixing stage

This stage offers the possibility to mix the internal beep or the phone signal to any other

source.

Due to the fact that the mixing stage is also located behind the In-Gain stage fine

adjustments of the main source level can be done in this way.

Loudness

There are four parameters programmable in the loudness stage (see Figure 5, 6 and 7):

● Attenuation

● Center frequency

● Loudness Q

● Flat Mode: in this mode the loudness stage works as a 0 - 15dB attenuator.

Figure 5. Loudness attenuation @ fc = 400 Hz Figure 6. Loudness center frequency @

(second order)

Atten. = 15 dB (second order)

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