SBAS661C February 2015 – May 2021 ADS1262 , ADS1263
Good power-supply decoupling is important in order to achieve optimum performance. Power supplies VAVDD, VAVSS and VDVDD must be decoupled to a common ground potential. For proper power-supply decoupling, place a 0.1-µF capacitor as close as possible to the supply with an additional 1-µF bulk capacitor placed nearby. Figure 11-1 shows decoupling for bipolar-supply (left figure) and single-supply (right figure) operation. When using bipolar supplies, bypass both AVDD and AVSS to ground separately, and include a bypass capacitor between AVDD and AVSS. Use a multilayer ceramic chip capacitors (MLCCs) that offers low equivalent series resistance (ESR) and equivalent series inductance (ESL) characteristics for power-supply decoupling purposes. The BYPASS pin is the bypass output of an internal 2-V regulator. The 2-V regulator powers the digital circuitry. Connect a ceramic or tantalum 1-µF capacitor from this pin to DGND. Do not load this voltage by external circuits.