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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7360 датащи(PDF) 19 Page - STMicroelectronics |
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TDA7360 датащи(HTML) 19 Page - STMicroelectronics |
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19 / 22 page  BALANCED INPUT IN BRIDGE CONFIGURATION A helpful characteristic of the TDA7360 is that,in bridge configuration, a signal present on both the input capacitors is amplified by the same amount and it is present in phase at the outputs,so this signal does not produce effects on the load.The typical value of CMRR is 46 dB. Looking at fig 46, we can see that a noise signal from the ground of the power amplifier to the ground of the hypothetical preamplifier is ampli- fied of a factor equal to the gain of the amplifier (2 * Gv). Using a configuration of fig. 47 the same ground noise is present at the output multiplied by the factor 2 * Gv/200. This means less distortion,less noise (e.g. motor cassette noise ) and/or a simplification of the lay- out of PC board. The only limitation of this balanced input is the maximum amplitude of common mode signals (few tens of millivolt) to avoid a loss of output power due to the common mode signal on the output, but in a large number of cases this signal is within this range. Figure 46 Figure 47 Figure 45 TDA7360 19/22 |
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