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

ZC Mute OFF (delayed until next zero crossing)

1

Zero Crossing Mute and Pause Detector Reset(*)

0

0

160mV ZC Window Threshold (WIN = 00)

0

1

80mV ZC Window Threshold (WIN = 01)

1

0

40mV ZC Window Threshold (WIN = 10)

1

1

20mV ZC Window Threshold (WIN = 11)

0

Nonsymmetrical Bass Cut

1

Symmetrical Bass Cut

LOUDNESS

MSB

LSB

LOUDNESS

D7

D6

D5

D4

D3

D2

D1

D0

X

X

X

00000

0dB

X

X

X

00001

-1.25dB

X

X

X

00010

-2.5dB

X

X

X

00011

-3.75dB

X

X

X

00100

-5dB

X

X

X

00101

-6.25dB

X

X

X

00110

-7.5dB

X

X

X

00111

-8.75dB

X

X

X

01000

-10dB

X

X

X

01001

-11.25dB

X

X

X

01010

-12.5dB

X

X

X

01011

-13.75dB

X

X

X

01100

-15dB

X

X

X

01101

-16.25dB

X

X

X

01110

-17.5dB

X

X

X

01111

-18.75dB

XXX

1

loudness OFF (1)

For example to select -17.5dB loudness the Data Byte is: XXX01110

Note (1):

If the loudness is switched OFF, the loudness stage is acting like a volume attenuator with flat fre quency response. D0 to D3 determine the

attenuation level

An additional direct mute function is included in the Speaker Attenuators

(*) BIT D4 = 1disables the zero cross mute and pause detector, otherwise always active

TDA7340G

12/27