TDA7404 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA7404 Datasheet PDF : 35 Pages
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TDA7404
I2C bus interface
Table 9. Loudness
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Function
Attenuation
0
0
0
0 0 dB
0
0
0
1 -1 dB
:
:
:
::
1
1
1
0 -14 dB
1
1
1
1 -15 dB
0
0
0
0
1
1
0
1
1
Filter / Center Frequency
off (flat) 'D6 must be = 0'
400 Hz
800 Hz
2.4 kHz
Shape
0
Low boost
1
Low and high boost
Soft-step-Volume
0
off
1
on
Note 1: The attenuation is specified at high frequencies. Around the center frequency the value is different
depending on the programmed attenuation (see Section 4.4: Loudness).
Table 10. Volume
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Function
Gain/attenuation
0
0
0
0
0
0
0 not allow
0
0
0
0
0
0
1 not allow
0
0
0
0
0
1
0 +30.0 dB
0
0
0
0
0
1
1 +29.0 dB
:
0
0
1
1
1
1
1 +1.0 dB
0
1
0
0
0
0
0 0.0 dB
0
1
0
0
0
0
1 - 1.0 dB
0
1
0
0
0
1
0 - 2.0 dB
1:
1
1
0
1
1
1
0 -78.0 dB
1
1
0
1
1
1
1 -79.0 dB
1
1
1
X
X
X
X Mute
Diffin - mode
0
Single ended stereo
1
Differential Stereo
Note 2: It is not recommended to use a gain more than 20 dB for system performance reason. In general, the
max. gain should be limited by software to the maximum value, which is needed for the system.
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