TDA7460ND STMicroelectronics, TDA7460ND Datasheet - Page 18

• Manufacturer Part Number: TDA7460ND
• Description: IC PROCESSOR CAR RAD SGNL SO-20
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of TDA7460ND

• Applications: Automotive Systems
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Description of the audio processor part
4.2.2
4.2.3
18/49
Soft mute
The digitally controlled soft mute stage allows muting/demuting the signal with a I
programmable slope. The mute process can either be activated by the soft mute pin or by
the I
regions (see
For timing purposes the Bit 3 of the I
muting until the end of demuting.
Figure 8.
1. Please notice that a started Mute action is always terminated and could not be interrupted by a change of
Soft step volume
When volume level is changed often an audible click appears at the output. The root cause
of those clicks could be either a DC offset before the volume stage or the sudden change of
the envelope of the audio signal. With the Soft step feature both kinds of clicks could be
reduced to a minimum and are no more audible (see
Figure 9.
2. For steps more than 1 dB the soft step mode should be deactivated because it could generate a 1 dB error
the mute signal.
during the blend-time
2
C bus. The slope is realized in a special S shaped curve to mute slow in the critical
Soft mute timing
Soft step timing
Figure
8.).
-1dB
-2dB
2dB
1dB
VOUT
+SIGNAL
-SIGNAL
I
2
MUTE
C BUS
EXT.
OUT
REF
1
1
2
C bus output register is set to 1 from the start of
10ms
D97AU634
Figure
D97AU635
9.).
Time
Time
TDA7460ND
2
C bus