TDA7415CB datasheet(19/50 Pages) STMICROELECTRONICS

19 / 50 page

TDA7415CB

Description of the audio processor

19/50

The CD-Changer- and Auxiliary/Navigation-inputs are quasi-differential inputs, where the

'out-of-phase' or ground signals of both channels share one common input. The Minidisk-

input (MD) may be reconfigured for a true mono differential input as required by many phone

units. Please note that all differential inputs dampen the signal by 3dB.

Additionally, each differential input-pin features a 'fast charge'-switch (*) allowing quickly

charging external, large coupling capacitors upon power-on of the device. For normal

operation, these switches need to be released by programming the corresponding bit.

For programming of the Input-section, see the programming chapter

5.2

Main signal processing path

The main-signal-processing path incorporates a classical three-band tone control (bass, mid

and treble) that is preceded by a gain-adjust amplifier and completed by a dedicated room

acoustics notch-filter (Room-EQ, see figure 1) that allows defeating the main car-body

resonance.

Hereafter, the filters composing the tone control and room-EQ will be presented.

5.2.1

Bass filter

There are four parameters programmable in the bass-filter stage.

Control Range: Figure 4 shows the control range in the frequency domain at 60Hz

center frequency.

Figure 4.

Bass control range; fC= 60Hz, Q= 1.0

TDA7415CB Datasheet(PDF) 19 Page - STMicroelectronics