TDA7407 datasheet(13/30 Pages) STMICROELECTRONICS

13 / 30 page

ure 5).

For timing purposes the Bit 3 of the I

2C bus out-

put register is set to 1 from the start of muting un-

til the end of demuting.

BASS

There are four parameters programmable in the

bass stage: (see figs 6, 7, 8, 9):

Attenuation

Figure 6 shows the attenuation as a function of

frequency at a center frequency at a center fre-

quency of 80Hz.

Center Frequency

Figure 7 shows the four possible center frequen-

cies 60,70,80 and 100Hz.

Quality Factors

Figure 8 shows the four possible quality factors 1,

1.25, 1.5 and 2.

DC Mode

In this mode the DC gain is increased by 5.1dB. In ad-

dition the programmed center frequency and quality

factor is decreased by 25% which can be used to

reach alternative center frequencies or quality factors.

MID

There are 3 parameters programmable in the mid

stage (see figs. 10, 11 & 12)

Attenuation

Figure 10 shows the attenuation as a function of

frequency at a center frequency of 1kHz.

Center Frequency

Figure 11 shows the four possible center frequen-

cies 500Hz, 1kHz, 1.5kHz and 2kHz.

Quality Factor

Figure 12 shows the two possible quality factors

1 and 2 at a center frequency of 1kHz.

TREBLE

There are two parameters programmable in the

treble stage (see figs 13, 14):

Attenuation

Figure 13 shows the attenuation as a function of

frequency at a center frequency of 17.5KHz.

Center Frequency

Figure 14 shows the four possible Center Fre-

quency (10, 12.5, 15 and 17.5kHz).

AC Coupling

In some applications additional signal manipula-

tions are desired, for example surround-sound or

more-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 Bass/Treble-

Configuration byte. In short condition the input-

signal of the speaker-attenuator is available at

AC Outputs and the AC Input could be used as

additional stereo inputs. The input impedance of

the AC Inputs is always 50K

Ω.

Speaker Attenuator

The speaker attenuators have exactely the same

EXT.

MUTE

+SIGNAL

REF

-SIGNAL

2C BUS

OUT

Time

D97AU634

Figure 5. Softmute Timing

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

10.0

100.0

1.0K

10.0K

Figure 6. Bass Control @ fc = 80Hz, Q = 1

Note: Please notice that a started Mute action is always terminated

and could not be interrupted by a change of the mute signal.

TDA7407

13/30

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