4.6.1 Overview

The SPDT is an integrated RF switch with low loss. For more details, refer to the ATA8210/ATA8215 UHF ASK/FSK Receiver Data Sheet (9344E), section 4.0, parameters 8.70 and 12.40. The SPDT contains an additional switchable damping for the RXMode to improve the blocking behavior of the ATA8210/15 in the presence of strong interferers. For more details, refer to the ATA8210/ATA8215 UHF ASK/FSK Receiver Data Sheet (9344E), section 4.0, parameterr 8.80. If there is a saturation of the Low-band or High-band LNA, the damping can be activated by setting FECR.ANDP = 1. The saturation is indicated by the FESR.LBSAT and FESR.HBSAT status bits.

The following figure shows the application of the integrated (SPDT) RF switch.

Because of 4 kV HBM and 200V MM ESD protection capabilities, a capacitance of 2.5 pF per pin and the series inductance have to be incorporated into the RX matching networks.

The following table shows the operating modes of the SPDT. All other modes are unsupported and have undefined behavior and must, therefore, be avoided. For more details on the insertion losses of these modes, refer to the ATA8210/ATA8215 UHF ASK/FSK Receiver Data Sheet (9344E), section 4.0 parameter numbers 8.70 and 8.80. The RF front-end registers shown in the following table control the SPDT RF switch.