Datasheet

Digital
Power Supply
Decoupling
100nF10uF
Analog
Power Supply
Decoupling
(if available)
100nF10uF
DV
CC
DV
SS
AV
CC
AV
SS
Celsius
Volts
0 50 100
1.000
0.800
0.900
1.100
1.200
1.300
−50
0.700
V
TEMP
=0.00355(TEMP
C
)+0.986
ADC10 Operation www.ti.com
Figure 22-13. Typical Temperature Sensor Transfer Function
22.2.9 ADC10 Grounding and Noise Considerations
As with any high-resolution ADC, appropriate printed-circuit-board layout and grounding techniques should
be followed to eliminate ground loops, unwanted parasitic effects, and noise.
Ground loops are formed when return current from the A/D flows through paths that are common with
other analog or digital circuitry. If care is not taken, this current can generate small, unwanted offset
voltages that can add to or subtract from the reference or input voltages of the A/D converter. The
connections shown in Figure 22-14 and Figure 22-15 help avoid this.
In addition to grounding, ripple and noise spikes on the power supply lines due to digital switching or
switching power supplies can corrupt the conversion result. A noise-free design is important to achieve
high accuracy.
Figure 22-14. ADC10 Grounding and Noise Considerations (Internal V
REF
)
550
ADC10 SLAU144J–December 2004–Revised July 2013
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