TAS5112DFD datasheet(16/19 Pages) TI

16 / 19 page

TAS5112

SLES048C − JULY 2003 − REVISED MARCH 2004

www.ti.com

CLICK AND POP REDUCTION

TI modulators feature a pop and click reduction system

that controls the timing when switching starts and stops.

Going from nonswitching to switching operation causes a

spectral energy burst to occur within the audio bandwidth,

which is heard in the speaker as an audible click, for

instance, after having asserted RESET LH during a

system start-up.

To make this system work properly, the following design

rules must be followed when using the TAS5112 back end:

D The relative timing between the PWM_AP/M_x

signals and their corresponding VALID_x signal

should not be skewed by inserting delays,

because this increases the audible amplitude

level of the click.

D The output stage must start switching from a

fully discharged output filter capacitor. Because

the output stage prior to operation is in the

high-impedance state, this is done by having a

passive pulldown resistor on each speaker

output

GND

(see

Typical

System

Configuration).

Other things that can affect the audible click level:

D The spectrum of the click seems to follow the

speaker impedance vs. frequency curve—the

higher the impedance, the higher the click

energy.

D Crossover filters used between woofer and

tweeter in a speaker can have high impedance

in the audio band, which should be avoided if

possible.

Another way to look at it is that the speaker impulse

response is a major contributor to how the click energy is

shaped in the audio band and how audible the click will be.

The following mode transitions feature click and pop

reduction.

STATE

CLICK AND

POP REDUCED

Normal(1)

→ Mute

Yes

Mute

→ Normal(1)

Yes

Normal(1)

→

Error recovery

(ERRCVY)

Yes

Error recovery

→ Normal(1)

Yes

Normal(1)

→ Hard Reset

Hard Reset

→ Normal(1)

Yes

(1) Normal = switching

REFERENCES

TAS5000 Digital Audio PWM Processor data

manual—TI (SLAS270)

True Digital Audio Amplifier TAS5001 Digital Audio

PWM Processor data sheet—TI (SLES009)

True Digital Audio Amplifier TAS5010 Digital Audio

PWM Processor data sheet—TI (SLAS328)

True Digital Audio Amplifier TAS5012 Digital Audio

PWM Processor data sheet—TI (SLES006)

TAS5026

Six-Channel

Digital

Audio

PWM

Processor data manual—TI (SLES041)

TAS5036A

Six-Channel

Digital

Audio

PWM

Processor data manual—TI (SLES061)

TAS3103 Digital Audio Processor With 3D Effects

data manual—TI (SLES038)

Digital Audio Measurements application report—TI

(SLAA114)

PowerPAD



Thermally

Enhanced

Package

technical brief—TI (SLMA002)

10. System Design Considerations for True Digital

Audio Power Amplifiers application report—TI

(SLAA117)

TAS5112DFD Datasheet(PDF) 16 Page - Texas Instruments

TAS5112DFD Datasheet(HTML) 16 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL