TI LMX2572RHAR

LMX2572 is a low-power, high-performance wideband synthesizer capable of generating any frequency from 12.5 MHz to 6.4 GHz without the use of an internal multiplier. This PLL delivers excellent performance with a current consumption of only 75 mA from a single 3.3 V supply.

For applications such as digital mobile radio (DMR) and wireless microphones, the LMX2572 supports FSK modulation. It supports both discrete-level FSK and pulse-shaping FSK. Discrete digital FSK modulation can be implemented via programming or pin control.

The LMX2572 allows users to synchronize the outputs of multiple devices and can support applications requiring a deterministic delay between input and output. The LMX2572 provides a precise phase adjustment option to address delay mismatches on the board or within the device. The frequency ramp generator can synthesize up to 2 ramp segments in either automatic ramp generation mode or manual mode for maximum flexibility. Through a fast calibration algorithm, users can change frequencies in less than 20 μs. The LMX2572 also supports generating or repeating SYSREF (compliant with JESD204B), making it an ideal low-power, low-noise clock source for high-speed data converter timing. Fine delay adjustment is available in this configuration to address delay variations across high-speed lines.

The LMX2572 integrates an LDO powered by a single 3.3 V supply, eliminating the need for an external on-board low-noise LDO.

• Output frequency: 12.5MHz to 6.4GHz
• Low power consumption: 75mA, 3.3V supply
• Phase noise of -106dBc/Hz at 100KHz offset and 6.4GHz carrier
• PLL figure of merit: -232dBc/Hz
• PLL normalized 1/f noise: -123.5dBc/Hz
• 32-bit fractional-N divider
• Programmable input multiplier for integer boundary spur elimination
• Output phase synchronization across multiple devices
• JESD204B SYSREF support with programmable delay
• Ramp and chirp function support
• FSK direct digital modulation support
• Dual programmable output power level differential outputs
• Fast VCO calibration: <20us
• 3V to 3.5V single supply

• Test and measurement instruments
• Two-wire digital audio broadcasting
• Low-power radio communication systems
• Wireless microphones
• Proprietary wireless connectivity
• MIMO
• Radar
• High-speed data converter timing