AT86RF230_09 ATMEL [ATMEL Corporation], AT86RF230_09 Datasheet - Page 5

• Manufacturer Part Number: AT86RF230_09
• Description: Low Power 2.4 GHz Transceiver for ZigBee, IEEE 802.15.4, 6LoWPAN, RF4CE and ISM
• Manufacturer: ATMEL [ATMEL Corporation]

4.2 Analog and RF Pins
5131E-MCU Wireless-02/09
AVDD, DVDD
AVDD and DVDD are outputs of the internal 1.8V voltage regulators. The voltage
regulators are controlled independently by the radio transceivers state machine and are
activated depending on the current radio transceiver state. The voltage regulators can
be configured for external supply. For details refer to section 9.4.
AVSS, DVSS
AVSS and DVSS are analog and digital ground pins respectively.
The analog and digital power domains should be separated on the PCB, for further
details see application note AVR2005 "Design Considerations for the AT86RF230".
RFP, RFN
A differential RF port (RFP/RFN) provides common-mode rejection to suppress the
switching noise of the internal digital signal processing blocks. At the board-level, the
differential RF layout ensures high receiver sensitivity by rejecting any spurious
interspersions originating from other digital ICs such as a microcontroller.
The RF port is designed for a 100Ω differential load. A DC path between the RF pins is
allowed. A DC path to ground or supply voltage is not allowed. Therefore, when
connecting a RF-load providing a DC path to the power supply or to ground, capacitive
coupling is required as indicated in Table 4-2.
A simplified schematic of the RF front end is shown in Figure 4-1.
Figure 4-1. Simplified RF Front-End Schematic
RF port DC values depend on the operating mode. In TRX_OFF state (see section
7.1.2), when the analog front end is disabled, the RF pins are pulled to ground,
preventing a floating voltage.
RFN
RFP
PCB
AT86RF230
M0
0.9V
RXTX
CM
Feedback
LNA
PA
RX
TX
AT86RF230
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