ANALOG DEVICES ADF5000 Service Manual

4 GHz to 18 GHz

ADF5000

DIVIDE

BY 2

BIAS

ADF5000

GND

RFIN

VDDx

RFOUT RFOUT

100Ω

50Ω

100Ω

1pF

3pF

1pF

09129-001

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.

Divide-by-2 Prescaler

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

Rev. 0

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