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描述
The LMX2572 is a low-power, high-performance wideband synthesizer that can generate any frequency from 13 MHz to 6.4 GHz without using an internal doubler. The PLL delivers excellent performance while consuming just 75 mA from a single 3.3-V supply.
For applications like digital mobile radio (DMR) and wireless microphones, the LMX2572 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 LMX2572 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 2 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 20 µs. The LMX2572 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 LMX2572 integrates LDOs from a single 3.3-V supply, thus eliminating the need for onboard low-noise LDOs.
特性
Output Frequency: 13 MHz to 6.4 GHz
Low Power Consumption: 75 mA at 3.3-V Supply
–106-dBc/Hz Phase Noise at 100-kHz Offset With 6.4-GHz Carrier
PLL Figure of Merit: –231 dBc/Hz
PLL Normalized 1/f Noise: –124 dBc/Hz
32-Bit Fractional-N Divider
Remove Integer Boundary Spurs With Programmable Input Multiplier
Synchronization of Output Phase Across Multiple Devices
Support for JESD204B SYSREF With Programmable Delay
Support for Ramp and Chirp Functions
Support for FSK Direct Digital Modulation
Two Programmable Output Power Level Differential Outputs
Fast VCO Calibration Speed: < 20 µs
Single 3-V to 3.5-V Power Supply
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