TDA7718NTR STMicroelectronics, TDA7718NTR Datasheet - Page 17

• Manufacturer Part Number: TDA7718NTR
• Description: IC PROCESSOR AUD CAR RAD 28TSSOP
• Manufacturer: STMicroelectronics
• Type: Audio Processorr

Specifications of TDA7718NTR

• Applications: Automotive Audio
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7718N
4.3
Note:
4.4
SoftMute
The digitally controlled SoftMute stage allows muting/demuting the signal with a I
programmable slope. The mute process can either be activated by the SoftMute pin or by
the I
regions (see
For timing purposes the bit 0 of the I
until the end of demuting.
Figure 7.
Please notice that a started mute-action is always terminated and could not be interrupted
by a change of the mute –signal.
SoftStep volume
When the volume-level is changed audible clicks could appear at the output. The root cause
of those clicks could either be a DC-offset before the volume-stage or the sudden change of
the envelope of the audio signal. With the SoftStep-feature both kinds of clicks could be
reduced to a minimum and are no more audible. The blend-time from one step to the next is
programmable as 5 ms or 10 ms. The SoftStep control is described in detail in
2
C bus. This slope is realized in a special S-shaped curve to mute slow in the critical
SoftMute timing
Figure
7).
+SIGNAL
-SIGNAL
I
2
MUTE
C BUS
EXT.
OUT
REF
1
1
Doc ID 16502 Rev 1
2
C bus output register is set to 1 from the start of muting
D97AU634
Description of the audioprocessor
Time
Chapter
2
C bus
17/40
4.9.