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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADC12L030CIWM датащи(PDF) 27 Page - National Semiconductor (TI) |
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ADC12L030CIWM датащи(HTML) 27 Page - National Semiconductor (TI) |
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27 / 35 page  Application Information (Continued) 2.1 Biasing for Various Multiplexer Configurations Figure 11 is an example of biasing the device for single- ended operation. The sign bit is always low. The digital output range is 0 0000 0000 0000 to 0 1111 1111 1111. One LSB is equal to 610 µV (2.5V/4096 LSBs). For pseudo-differential signed operation the biasing circuit shown in Figure 13 shows a signal AC coupled to the ADC. This gives a digital output range of −4096 to +4095. With a 1.25V reference, 1 LSB is equal to 305 µV. Although the ADC is not production tested with a 1.25V reference, linear- ity error typically will not change more than 0.3 LSB. With the ADC set to an acquisition time of 10 clock periods the input biasing resistor needs to be 600 Ω or less. Notice though that the input coupling capacitor needs to be made fairly large to bring down the high pass corner. Increasing the acquisition time to 34 clock periods (with a 5 MHz CCLK frequency) would allow the 600 Ω to increase to 6k, which with a 1 µF coupling capacitor would set the high pass corner at 26 Hz. The value of R1 will depend on the value of R2. An alternative method for biasing pseudo-differential opera- tion is to use the +1.25V from the LM4040 to bias any amplifier circuits driving the ADC as shown in Figure 12. The value of the resistor pull-up biasing the LM4040-2.5 will depend upon the current required by the op amp biasing circuitry. Fully differential operation is shown in Figure 14. One LSB for this case is equal to (2.5V/4096) = 610 mV. 01183046 FIGURE 11. Single-Ended Biasing 01183048 FIGURE 12. Alternative Pseudo-Differential Biasing www.national.com 27 |
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