TDA7340G Datasheet, PDF (12/27 Pages) STMicroelectronics – AUDIO SIGNAL PROCESSOR

TDA7340G
LOUDNESS
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
LOUDNESS
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)
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 frequency response. D0 to D3 determine the
attenuation level
MUTE
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
1 Soft Mute On
0
1 Soft Mute with fast slope (I = IMAX)
1
1 Soft Mute with slow slope (I = IMIN)
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
An additional direct mute function is included in the Speaker Attenuators
(*) BIT D4 = 1disables the zero cross mute and pause detector, otherwise always active
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