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ADC10 Operation
18-22
ADC10
18.2.9 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 18−15 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 18−16. ADC10 Grounding and Noise Considerations
V
CC
V
SS
Power Supply
Decoupling
MSP430F12x2
MSP430F11x2
Ve
REF+
V
REF−
10 uF 100 nF
+
External
Reference