ADC12030CIWM National Semiconductor, ADC12030CIWM Datasheet - Page 33

• Manufacturer Part Number: ADC12030CIWM
• Description: Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold
• Manufacturer: National Semiconductor

Application Hints
3.0 REFERENCE VOLTAGE
The difference in the voltages applied to the V
V
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
−
defines the analog input span (the difference between
FIGURE 14. Pseudo-Differential Biasing without the Loss of Digital Output Range
(Continued)
REF
+
or V
FIGURE 15. Fully Differential Biasing
REF
−
must have
REF
+
and
33
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.
DS011354-50
DS011354-49
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