E-TDA7404D STMicroelectronics, E-TDA7404D Datasheet - Page 21

• Manufacturer Part Number: E-TDA7404D
• Description: IC PROCESSOR CAR SIGNAL 28SOIC
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of E-TDA7404D

• Applications: Automotive Systems
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7404
4.9
4.10
4.11
External AC - coupling
TDA7404 has external AC coupling terminals which can be selected one of two positions
behind the mixing stage or bass filter.
Figure 16. External AC coupling
The external AC coupling is selected in position of four switches controlled by the lower 2bit
in the Others selection
Table 6.
Speaker attenuator
Due to practical aspects the steps in the speaker-attenuator are not linear over the full
range. At attenuations more than 24 dB the steps increase from 1.5 dB to 10 dB (please see
data byte specification).
Subwoofer attenuator
The Subwoofer output is a single ended stereo output. The attenuator is exactly the same
like the other speakers.
In pu t
D1
X
0
1
D0
Mixin g
St a ge
0
1
1
Others selection
SW3 = ON, SW4 = ON (selected internal pass), SW1 = b, SW2 = open
SW3 = OFF, SW4 = ON, SW1 = a, SW2 = a
SW3 = ON, SW4 = OFF, SW1 = b, SW2 = b
SW1
a
(seeTable
ACOUT
b
SW3
6).
Volu m e & F ilt er
SOUND
E F F E CTS
Switch position
Description of functionality
SW4
SW2
a
ACIN
b
ACC select or
Spea k er
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