1 Features
1• Output Frequencies: 300 MHz to 4.8 GHz
• Low-Noise VCO: –133 dBc/Hz
(1-MHz Offset, fOUT = 2.65 GHz)
• 13-/16-Bit Reference/Feedback Divider
• 25-Bit Fractional-N and Integer-N PLL
• Low RMS Jitter: 0.35 ps
• Input Reference Frequency Range:
0.5 MHz to 350 MHz
• Programmable Output Divide-by-1/-2/-4/-8
• Four Differential LO Outputs
• External VCO Input with Programmable VCO offOn/
Off Control

2 Applications
• Wireless Infrastructure
• Wireless Local Loop
• Point-to-Point Wireless Access
• Wireless MAN Wideband Transceivers

3 Description
The TRF3765 is a wideband Integer-N/Fractional-N
frequency synthesizer with an integrated, wideband voltage-controlled oscillator (VCO). Programmable
output dividers enable continuous frequency
coverage from 300 MHz to 4.8 GHz. Four separate
differential, open-collector RF outputs allow multiple
devices to be driven in parallel without the need of external splitters.
The TRF3765 also accepts external VCO input
signals and allows on/off control through a
programmable control output. For maximum flexibility
and wide reference frequency range, wide-range
divide ratio settings are programmable and an offOn/
chip loop filter can be used.
The TRF3765 is available in an RHB-32 VQFN
package.