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ADC12138CIWM Datasheet(PDF) 33 Page - National Semiconductor (TI) |
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ADC12138CIWM Datasheet(HTML) 33 Page - National Semiconductor (TI) |
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33 / 42 page ![]() Application Information (Continued) fier circuits driving the ADC as shown in Figure 13. The value of the resistor pull-up biasing the LM4040-2.5 will depend upon the current required by the op amp biasing circuitry. In the circuit of Figure 13 some voltage range is lost since the amplifier will not be able to swing to +5V and GND with a single +5V supply. Using an adjustable version of the LM4041 to set the full scale voltage at exactly 2.048V and a lower grade LM4040D-2.5 to bias up everything to 2.5V as shown in Figure 14 will allow the use of all the ADC’s digital output range of −4096 to +4095 while leaving plenty of head room for the amplifier. Fully differential operation is shown in Figure 15. One LSB for this case is equal to (4.1V/4096)=1mV. 01207940 FIGURE 13. Alternative Pseudo-Differential Biasing 01207941 FIGURE 14. Pseudo-Differential Biasing without the Loss of Digital Output Range www.national.com 33 |
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