CC2480A1 Datasheet, PDF (36/48 Pages) Texas Instruments – Z-Accel 2.4 GHz ZigBee® Processor

CC2480
11 Voltage Regulators
The CC2480 includes two low drop-out voltage
regulators. These are used to provide a 1.8 V
power supply to the CC2480 analog and digital
power supplies.
Note: It is recommended that the voltage
regulators are not used to provide power to
external circuits. This is because of limited
power sourcing capability and due to noise
considerations. External circuitry can be
powered if they can be used when internal
power consumption is low and can be set I PD
mode when internal power consumption I high.
11.1 Voltage Regulators Power-on
When the analog voltage regulator is powered-
on before use of the radio, there will be a
delay before the regulator is enabled.
The analog voltage regulator input pin
AVDD_RREG is to be connected to the
unregulated 2.0 to 3.6 V power supply. The
regulated 1.8 V voltage output to the analog
parts, is available on the RREG_OUT pin. The
digital regulator input pin AVDD_DREG is also
to be connected to the unregulated 2.0 to 3.6
V power supply. The output of the digital
regulator is connected internally within the
CC2480 to the digital power supply.
The voltage regulators require external
components as described in section 8 on page
20.
The digital voltage regulator is disabled when
the CC2480 is placed in low power modes to
reduce power consumption.
CC2480 Data Sheet SWRS074
Page 36 of 43