Datasheet

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
www.ti.com ADC12 Operation
Figure 23-10. Typical Temperature Sensor Transfer Function
23.2.8 ADC12 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 23-11 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 using separate analog and
digital ground planes with a single-point connection is recommend to achieve high accuracy.
571
SLAU144J–December 2004–Revised July 2013 ADC12
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