The ATA8404/ATA8405 is a PLL transmitter IC, which has been developed for the demands of RF low-cost transmission systems at data rates up to 20 kBaud Manchester coding and 40 kBaud NRZ coding. The transmitting frequency range is 313 MHz to 317 MHz (ATA8404) and 432 MHz to 448 MHz (ATA8405), respectively. It can be used in both FSK and ASK systems. Figure 1-1.