Operation

AN4170

4/15

Doc ID 023709 Rev 1

Figure 2.

Demonstration board connections

1.4

Powering up

Before powering up the demonstration board, ensure that the TDA7491HV 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