The circuit shown in Figure 2-1 shows all connections to the ADS127L11 data converter (U3). Each power-supply connection has a 1-μF and 100-nF decoupling capacitor. Make sure these capacitors are physically close to the device and have a good connection to the GND plane. The supply connections also have a series 0.1-Ω resistor. The purpose of this component is to facilitate current measurement for the ADC. Also, each digital input has a 10-Ω series resistor. These resistors smooth the edges of the digital signals so that they have minimal overshoot and ringing. Although not strictly required, these components may be included in the final design to improve digital signal integrity.

Figure 2-1 ADS127L11 Connections and Decoupling