The LMX2581 is a low noise wideband frequency synthesizer which integrates a delta-sigma fractional N PLL, multiple core VCO, programmable output divider, and two differential output buffers. The VCO frequency range is from 1880 to 3760 MHz and can be sent directly to the output buffers or divided down by even values from 2 to 38. Each buffer is capable of output power from -3 to +12 dBm at 2700 MHz. Integrated low noise LDOs are used for superior noise immunity and consistent performance.
1. Output Frequency from 50 to 3760 MHz
2. Input Clock Frequency up to 900 MHz
3. Phase Detector Frequency up to 200 MHz
1. Broadband Wireless
2. Test and Measurement
3. Clock Generation
Other data sheets within the file : LMX2581SQ/NOPB, LMX2581SQE/NOPB, LMX2581SQX/NOPB
The device is a single-chip PLL frequency synthesizer designed for TV and VCR tuning systems. The circuit consists of a divide-by-eight prescaler with its own preamplifier, a 15-bit programmable divider, a crystal oscillator and its programmable reference divider and a phase/frequency detector combined with a charge-pump which drives the tuning amplifier and the 33 V output. Four high-current PNP band switch buffers are provided for band switching. Two PNP buffers can be switched on simultaneously. The sum of the collector currents is limited to 50 mA.
1. Complete 1.3 GHz single chip system
2. Four PNP band switch buffers (40 mA)
3. 33 V output tuning voltage
4. In-lock detector
5. 5-step ADC
6. 15-bit programmable divider
7. Low power and low radiation