4 GHz to 18 GHz

Divide-by-2 Prescaler

ADF5000

Rev. 0

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FEATURES

Divide-by-2 prescaler

High frequency operation: 4 GHz to 18 GHz

Integrated RF decoupling capacitors

Low power consumption

Active mode: 30 mA

Power-down mode: 17 mA

Low phase noise: −147 dBc/Hz

Single dc supply: 3.3 V compatible with ADF4xxx PLLs

Temperature range: −40°C to +105°C

Small package: 3 mm × 3 mm LFCSP

APPLICATIONS

PLL frequency range extender

Point-to-point radios

VSAT radios

Communications test equipment

GENERAL DESCRIPTION

The ADF5000 prescaler is a low noise, low power, fixed RF

divider block that can be used to divide down frequencies as

high as 18 GHz to a lower frequency suitable for input to a

PLL IC, such as the ADF4156 or the ADF4106. The ADF5000

provides a divide-by-2 function. The ADF5000 operates from

a 3.3 V supply and has differential 100 Ω RF outputs to allow

direct interface to the differential RF inputs of PLLs such as

the ADF4156 and ADF4106.

FUNCTIONAL BLOCK DIAGRAM

DIVIDE

BY 2

BIAS

ADF5000

CE

GND

RFIN

VDDx

RFOUT

RFOUT

100

Ω

50

Ω

100

Ω

1pF

3pF

1pF

Figure 1.