+VS(V)

VIN

(mV)

VST-BY

pin 7

Iq

(mA)

ST-BY

MUTE

PLAY

MUTE

ST-BY

+18

1.8

0.8

VMUTE

pin 6

4.1

2.3

OFF

OFF

D96AU259

VOUT

(V)

2.9

1.3

Figure 2: Microprocessor Driving Signals.

(B) Low Cost Application

In low cost applications where the mP is not pre-

sent, the suggested circuit is shown in fig.3.

The St-by and mute terminals are tied together

and they are connected to the supply line via an

external voltage divider.

The device is switched-on/off from the supply line

and the external capacitor C4 is intended to delay

the St-by and mute threshold exceeding, avoiding

"Popping" problems.

TDA7297

4/9