Software specification

TDA7342

14/20

For example to select -17.5dB attenuation, loudness OFF, the Data Byte is: X X X1 1 1 1 0

NOTE 1: If the loudness is switched OFF, the loudness stage is acting like a volume attenuator with flat

frequency response. D0 to D3 determine the attenuation level.

Table 8.

Loudness

MSB

LSB

Function

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

0

0

0

0

0

0dB

X

X

X

0

0

0

0

1

-1.25dB

X

X

X

0

0

0

1

0

-2.5dB

X

X

X

0

0

0

1

1

-3.75dB

X

X

X

0

0

1

0

0

-5dB

X

X

X

0

0

1

0

1

-6.25dB

X

X

X

0

0

1

1

0

-7.5dB

X

X

X

0

0

1

1

1

-8.75dB

X

X

X

0

1

0

0

0

-10dB

X

X

X

0

1

0

0

1

-11.25dB

X

X

X

0

1

0

1

0

-12.5dB

X

X

X

0

1

0

1

1

-13.75dB

X

X

X

0

1

1

0

0

-15dB

X

X

X

0

1

1

0

1

-16.25dB

X

X

X

0

1

1

1

0

-17.5dB

X

X

X

0

1

1

1

1

-18.75dB

X

X

X

1

D3

D2

D1

D0

Loudness OFF (1)

Table 9.

Mute

MSB

LSB

Function

D7

D6

D5

D4

D3

D2

D1

D0

1

Soft mute on

0

1

1

1

1

Direct mute

0

1

Zero crossing mute on

0

0

Zero crossing mute off

(delayed until the next zerocrossing)

1

Zero crossing mute and pause detector

reset

0

0

160mV ZC Window threshold (WIN = 00)

0

1

80mV ZC Window threshold (WIN = 01)