4.1 RX-TX Setup

This section describes application-relevant information for the use of the RF circuits within the ATA8510/15. In a transceiver system, the frequency planning and the frequency accuracy are of importance. This is discussed in Frequency Accuracy in System Design. The frequency can be chosen in a wide range. Not all variations are reasonable due to the chip architecture. Fractional-N Divider and SDM shows the limitations. The RF circuits of the IC, either on the RX or TX side, must be matched to the antenna. High-Q surface-mounted devices (SMD) must be used on the board to match the LNA inputs and the PA output, respectively. The matching components for the application board (described in Application Board Design) are summarized for a wide variety of frequencies and output powers. The data for these matching devices are located in Impedance Matching of RFIN and RF_OUT. Finally, the ATA8510/15 delivers an automated antenna tuning. The application of this feature is described in Antenna Tuning in more detail.