Operation

AN3412

4/15

Doc ID 018920 Rev 1

Figure 2.

Demonstration board connections

1.4

Powering up

Before powering up the demonstration board, ensure that the TDA7491P is in standby and

mute conditions and the gain is set to the desired value (default 20 dB). Verify also the

dedicated switches and jumpers.

Figure 3.

Standby and mute switches

Analog

Inputs

GND

+VCC

Dummy

Load

Dummy

Load

STBY

MUTE

Table 2.

Standby and mute settings

STBY (S1)

Mute (S2)

Status

L

L

STBY

L

H

STBY

HL

MUTE

HH

PLAY

L

L

H

H

S1= STBY

S2= MUTE