E-TDA7462DTR STMicroelectronics, E-TDA7462DTR Datasheet - Page 10

• Manufacturer Part Number: E-TDA7462DTR
• Manufacturer: STMicroelectronics

Specifications of E-TDA7462DTR

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 28
• Package Type: SOIC
• Lead Free Status / RoHS Status: Compliant

TDA7462
Figure 3. Loudness Attenuation @ fc = 400Hz
-10.0
-15.0
-20.0
Figure 4. Loudness Center frequency @ Attn.
-10.0
-15.0
-20.0
Figure 5. Loudness @ Attn. = 15dB, fc = 400Hz
SoftMute
The digitally controlled SoftMute stage allows
muting/de-muting the signal with a I
10/25
-5.0
-5.0
0.0
0.0
(dB)
-10
-15
-20
-5
10.0
10.0
10
(second order)
= 15dB (second order)
100.0
100.0
100
1,000
1.0K
1.0K
2
C bus pro-
D98AU844
10.0K
10.0K
Hz
grammable slope. The mute process can either
be activated by the SoftMute pin(SM) or by the
I
shaped curve to mute slow in the critical regions
(see Figure 6).
For timing purposes the Bit 3 of the I
put register is set to 1 from the start of muting un-
til the end of de-muting.
Figure 6. Softmute Timing
Note: 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 in
four steps.
Figure 7. Soft Step Timing
Note: For steps more than 1dB the softstep mode should be
deactivated because it could generate a 1dB error during the
blend-time
2
C bus. This slope is realized in a special S-
-1dB
-2dB
+SIGNAL
2dB
1dB
-SIGNAL
I
VOUT
2
MUTE
C BUS
EXT.
OUT
REF
1
1
10ms
D97AU634
D97AU635
2
C bus out-
Time
Time