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TDA2030A View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
TDA2030A 18W Hi-Fi AMPLIFIER AND 35W DRIVER ST-Microelectronics
STMicroelectronics ST-Microelectronics
TDA2030A Datasheet PDF : 16 Pages
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TDA2030A
MUSICAL INSTRUMENTS AMPLIFIERS
Another important field of application for active
systems is music.
In this area the use of several medium power
amplifiers is more convenient than a single high
power amplifier, and it is also more realiable.
A typical example (see Figure 21) consist of four
amplifiers each driving a low-cost, 12 inch loud-
speaker. This application can supply 80 to
160WRMS.
Figure 21 : High Power Active Box
for Musical Instrument
down to the values as low as 0.002% in high power
amplifiers.
Figure 22 : Overshoot Phenomenon in Feedback
Amplifiers
TRANSIENT INTERMODULATION DISTOR-
TION (TIM)
Transient intermodulation distortion is an unfortu-
nate phenomen associated with negative-feedback
amplifiers. When a feedback amplifier receives an
input signal which rises very steeply, i.e. contains
high-frequency components, the feedback can ar-
rive too late so that the amplifiers overloads and a
burst of intermodulation distortion will be produced
as in Figure 22. Since transients occur frequently
in music this obviously a problem for the designer
of audio amplifiers. Unfortunately, heavy negative
feedback is frequency used to reduce the total
harmonic distortion of an amplifier, which tends to
aggravate the transient intermodulation (TIM situ-
ation. The best known method for the measurement
of TIM consists of feeding sine waves superim-
posed onto square waves, into the amplifier under
test. The output spectrum is then examined using
a spectrum analyser and compared to the input.
This method suffers from serious disadvantages :
the accuracy is limited, the measurement is a rather
delicate operation and an expensive spectrum an-
alyser is essential. A new approach (see Technical
Note 143) applied by SGS-THOMSON to mono-
lithic amplifiers measurement is fast cheap-it re-
quires nothing more sophisticated than an
oscilloscope - and sensitive - and it can be used
The "inverting-sawtooh" method of measurement
is based on the response of an amplifier to a 20kHz
sawtooth waveform. The amplifier has no difficulty
following the slow ramp but it cannot follow the fast
edge. The output will follow the upper line in Fig-
ure 23 cutting of the shaded area and thus increas-
ing the mean level. If this output signal is filtered to
remove the sawtooth, direct voltage remains which
indicates the amount of TIM distortion, although it
is difficult to measure because it is indistinguish-
able from the DC offset of the amplifier. This prob-
lem is neatly avoided in the IS-TIM method by
periodically inverting the sawtooth waveform at a
low audio frequency as shown in Figure 24.
Figure 23 : 20kHz Sawtooth Waveform
Figure 24 : Inverting Sawtooth Waveform
11/15
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