Low power wideband RF synthesizer with phase synchronization

The LMX2572 is a low-power, high-performance wideband synthesizer from Texas Instruments. The device can generate any frequency from 13MHz to 6.4GHz without using an internal doubler. The PLL delivers excellent performance while consuming just 75mA from a single 3.3V supply. For applications like DMR and wireless microphones, the device supports FSK modulation. The serial interface can be configured as a SPI or I2S interface for this purpose. Discrete level FSK and pulse-shaping FSK are supported. Direct digital FSK modulation is achievable through programming or pins. The device allows users to synchronize the output of multiple devices and also enables applications that need deterministic delay between input and output. An option is provided to adjust the phase with fine granularity to account for delay mismatch on the board or within devices. A frequency ramp generator can synthesize up to two segments of ramp in an automatic ramp generation option or a manual option for maximum flexibility. The fast calibration algorithm allows changing frequencies faster than 20µs. The device also supports generating or repeating SYSREF (compliant to JESD204B standard) making it an ideal low-power, low-noise clock source for clocking high-speed data converters. Fine delay adjustment is provided in this configuration to account for delay differences of board traces. The device integrates LDOs from a single 3.3V supply, thus eliminating the need for onboard low-noise LDOs.