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.