TDA7300 Datasheet, PDF (8/16 Pages) STMicroelectronics – DIGITAL CONTROLLED STEREO AUDIO PROCESSOR

TDA7300
APPLICATION INFORMATION
Volume Control Concept
Traditional electronic volume control circuits use a
multiplier technique with all the disadvantages of
high noise and distortion.
The used concept, as shown in Fig. 15 with digital
switched resistor dividers, provides extremely low
noise and distortion. The multiplexing of the resis-
tive dividers is realized with a multiple-input op-
erational amplifier.
Figure 16: Bass Control
Bass and Treble Control
The principle operation of the bass control is
shown in Fig. 16. The external filter together with
the internal buffer allows a flexible filter design ac-
cording to the different requirements in car radios.
The function of the treble is similar to the bass.
A typical curve is shown in Fig.19.
Outputs
A special class-A output amplifier with a modu-
lated sink current provides low distortion and
ground compatibility with low current consump-
tion.
Figure 17: Quiescent Current vs. Supply Voltage
Figure 15: Volume Control
Figure 18: Quiescent Current vs. Temperature
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