TDA7513T datasheet(34/84 Pages) STMICROELECTRONICS

34 / 84 page

Functional description

TDA7513T

34/84

3.4.10

DC Mode

In this mode the DC gain is increased by 5.1dB. In addition the programmed center

frequency and quality factor is decreased by 25%: this can be used to realize different

center frequencies or quality factors with respect to the values listed in the "BASS" section.

3.4.11

MID

There are 3 parameters programmable in the mid filter stage (see

Figure 9, 10 and 11):

3.4.12

Attenuation

Figure 9 shows the attenuation as a function of frequency at a center frequency of 1kHz.

3.4.13

Center frequency

Figure 10 shows the four possible center frequencies: 500Hz, 1kHz, 1.5kHz and 2kHz.

3.4.14

Quality factor

Figure 11 shows the two possible quality factors (1 and 2) at a center frequency of 1kHz.

3.4.15

TREBLE

There are two parameters programmable in the treble filter stage (see

Figure 12, 13):

3.4.16

Attenuation

Figure 12 shows the attenuation as a function of frequency at a center frequency of

17.5kHz.

3.4.17

Center frequency

Figure 13 shows the four possible Center Fre-quencies: 10, 12.5, 15 and 17.5kHz.

3.4.18

AC coupling

In some applications additional signal manipulations are desired such as surround-sound

processing or more extensive band equalizing. For this purpose a AC-Coupling is placed

before the Speaker-attenuators, which can be activated or internally shorted by Bit7 in the

APSD data byte 0. The input impedance of the AC Inputs is 25k

Ω. The external AC coupling

is advised for those applications where very low-level "pop" performance is a must.

3.4.19

Speaker attenuator

The speaker attenuators have exactly the same structure and range as the Volume stage.

3.5

Stereo decoder

The stereo decoder part of the present device (see

Figure 14) contains all functions

necessary to demodulate the MPX signal such as pilot tone-dependent MONO/STEREO

switch as well as "stereoblend" and "highcut" functions.

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