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ADC12138CIWM bảng dữ liệu(PDF) 33 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện ADC12138CIWM
Giải thích chi tiết về linh kiện  Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold
PDF  42 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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ADC12138CIWM bảng dữ liệu(HTML) 33 Page - National Semiconductor (TI)

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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
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