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TDA7284D Fiches technique(PDF) 10 Page - STMicroelectronics |
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TDA7284D Fiches technique(HTML) 10 Page - STMicroelectronics |
10 / 14 page peak-to-peak detector of fig. 16 is now inside the broken line 1 while the system which allows a di- namic resistance varying with the DC voltage level (i.e. inversely proportional to the op-amp output signal),is inside the broken line 2. It should be noted that the generator resistance Ri has no influence on the controlled voltage value Vc, although its value should be between 1 and 47 Kohm. The lower limit is determined by the minimum dy- namic resistance of 10 ohm and therefore to have a control range of 40 dB for the input signal, Ri must be greather than 1.5 Kohm. The upper limit results from the necessity to limit the attenuation of the signal by the input imped- ance of the op-amp. Switches Two DC-controlled switches are also included in the chip (fig. 20 ) Fig. 19 shows the typical application circuit of the TDA7284 utilizing the equalization switch for nor- mal or chrome tape playback equalization.The advantage is the components can be placed near to the IC, while the tape selector switch can be at a remote location, hence reduce the chances of noise and oscillation due to components layout. Another advantage is that only one pole is needed for the tape selector switch as compared to the two poles needed by conventional circuits (one separate pole for each channel). Fig. 22 shows the use of the switches to obtain the mute function. Figure 20 Figure 21: Application Circuit with DC Switching of Normal/Chrome Tape Equalization TDA7284 10/14 |
Numéro de pièce similaire - TDA7284D |
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Description similaire - TDA7284D |
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