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ADC12138CIWM Datasheet(PDF) 32 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # ADC12138CIWM
Description  Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold
PDF  41 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC12138CIWM Datasheet(HTML) 32 Page - National Semiconductor (TI)

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Application Hints (Continued)
3.0 REFERENCE VOLTAGE
The difference in the voltages applied to the V
REF
+ and
V
REF
− defines the analog input span (the difference between
the voltage applied between two multiplexer inputs or the
voltage applied to one of the multiplexer inputs and analog
ground), over which 4095 positive and 4096 negative codes
exist. The voltage sources driving V
REF
+ or V
REF
− must have
very low output impedance and noise. The circuit in
Figure
16 is an example of a very stable reference appropriate for
use with the device.
DS012079-41
FIGURE 14. Pseudo-Differential Biasing without the Loss of Digital Output Range
DS012079-42
FIGURE 15. Fully Differential Biasing
www.national.com
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