14.4.5.1 Overview

The internal voltage regulators supply a stabilized voltage to the AT86RF212B. The AVREG provides the regulated 1.8V supply voltage for the analog domain and the DVREG supplies the 1.8V supply voltage for the digital domain.

A simplified schematic of the internal analog voltage regulator is shown in the figure below.

Figure 14-49. Simplified Schematic of AVREG

A simplified schematic of the internal digital voltage regulator is shown in the figure below.

Figure 14-50. Simplified Schematic of DVREG

The block “Low power voltage regulator” within the “Digital voltage regulator” maintains the DVDD supply voltage at 1.5V (typical) when the AT86RF212B voltage regulator is disabled in sleep mode. All configuration register values are stored.

The low power voltage regulator is always enabled. Therefore, its bias current contributes to the leakage current in sleep mode with about 100nA (typical).

The voltage regulators (AVREG, DVREG) require bypass capacitors for stable operation. The value of the bypass capacitors determine the settling time of the voltage regulators. The bypass capacitors shall be placed as close as possible to the pins and shall be connected to ground with the shortest possible traces.