In addition to the overload protection described

above, the device features a thermal shutdown

circuit which initially puts the device into a muting

state (@ Tj = 145

Tj = 150

Full protection against electrostatic discharges on

every pin is included.

3) Other Features

The device is provided with both stand-by and

mute functions, independently driven by two

CMOS logic compatible input pins.

The circuits dedicated to the switching on and off

of the amplifier have been carefully optimized to

avoid any kind of uncontrolled audible transient at

the output.

The sequence that we recommend during the

ON/OFF transients is shown by Figure 16.

The application of figure 17 shows the possibility

of using only one command for both st-by and

mute functions. On both the pins, the maximum

applicable range corresponds to the operating

supply voltage.

1N4148

10K

30K

20K

10

µF

10

µF

MUTE

STBY

D93AU014

MUTE/

ST-BY

Figure 17: Single Signal ST-BY/MUTE Control

Circuit

PLAY

OFF

ST-BY

MUTE

MUTE

ST-BY

OFF

D93AU013

5V

5V

+Vs

(V)

+35

-35

VMUTE

PIN #10

(V)

VST-BY

PIN #9

(V)

-Vs

VIN

(mV)

IP

(mA)

VOUT

(V)

Figure 16: Turn ON/OFF Suggested Sequence

TDA7294

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