FEATURES

► RFOUT output frequency range: 7300MHz to 8500MHz

► PDIV_OUT and NDIV_OUT frequency range: 57MHz to

8500MHz

► Fractional-N synthesizer and Integer N synthesizer modes

► Typical PFD spurious: <−105dBc

► Integrated RMS jitter at 1kHz to 100MHz integration bandwidth:

<40fs

► Normalized inband phase noise floor FOM

► Integer mode: −232dBc/Hz

► Fractional mode: −229dBc/Hz

► Maintains frequency lock over −40°C to +105°C (lock and leave)

► Low open-loop VCO phase noise

► −115dBc/Hz typical at 100kHz offset (RFOUT at 7.3GHz)

► RFOUT power (typical): 6dBm

► Programmable divide by 1, 2, 4, 8, 16, 32, 64, or 128 output

► Programmable output power level

► Typical power dissipation: 1W

► 48-terminal, 7 mm × 7 mm LGA package: 49 mm2

APPLICATIONS

► Military and defense

► Test equipment

► Clock generation

► Wireless infrastructure

► Satellite and very small aperture terminals (VSATs)

► Microwave radios

GENERAL DESCRIPTION

The ADF5612 allows implementation of fractional-N or Integer N

phase-locked loop (PLL) frequency synthesizers when used with

an external loop filter and an external reference source. The wideband

microwave voltage controlled oscillator (VCO) design permits

frequency operation from 7300MHz to 8500MHz at a single RF

output. A series of frequency dividers with a differential frequency

output allows operation from 57MHz to 8500MHz. Analog and

digital power supplies for the PLL circuitry range from 3.15V to

3.45V, and the VCO supplies are between 4.75V and 5.25V.

The ADF5612 has an integrated VCO with a fundamental frequency

of 3650MHz to 7300MHz. These frequencies are internally doubled

and routed to the RFOUT pin. An additional differential output

allows the doubled VCO frequency to be divided by 1, 2, 4, 8, 16,

32, 64, or 128, allowing the user to generate RF output frequencies

as low as 57MHz. A simple 3-wire or 4-wire serial port interface

(SPI) provides control of all on-chip registers. To conserve power,

this divider block can be disabled when not needed through the

SPI. Likewise, the output power for both the single-ended output

and the differential output are programmable.

The integrated phase detector and Δ-Σ modulator, capable of operating

at up to 100MHz, permit wide loop bandwidths and fast

frequency tuning with a typical spurious level of −105dBc.

With a VCO open-loop phase noise at 100kHz offset of −115dBc/Hz

at 7.3GHz RFOUT. The ADF5612 is equipped to minimize blocker

effects and to improve receiver sensitivity and transmitter spectral

purity. The low phase noise floor eliminates any contribution to

modulator and mixer noise floor in transmitter applications.