ADF4360-2BCPRL7 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADF4360-2BCPRL7

Integrated Synthesizer and VCO

Analog Devices 

The operating current in the VCO core is programmable in four

steps: 5 mA, 10 mA, 15 mA, and 20 mA. This is controlled by

Bit PC1 and Bit PC2 in the control latch. For VCO frequencies

above 2 GHz, only the 15 mA core current should be used, and

for frequencies below 2 GHz, only 20 mA core current should

be used.

OUTPUT STAGE

The RFOUTA and RFOUTB pins of the ADF4360 family are

connected to the collectors of an NPN differential pair driven

by buffered outputs of the VCO, as shown in Figure 15. To

allow the user to optimize the power dissipation vs. the output

power requirements, the tail current of the differential pair is

programmable via Bit PL1 and Bit PL2 in the control latch. Four

current levels can be set: 3.5 mA, 5 mA, 7.5 mA, and 11 mA.

These levels give output power levels of −13 dBm, −11 dBm,

−8 dBm, and −6 dBm, respectively, using a 50 Ω resistor to VDD

and ac coupling into a 50 Ω load. Alternatively, both outputs

can be combined in a 1 + 1:1 transformer or a 180° microstrip

coupler (see the Output Matching section).

ADF4360-2

If the outputs are used individually, the optimum output stage

consists of a shunt inductor to VDD.

Another feature of the ADF4360 family is that the supply

current to the RF output stage is shut down until the part

achieves lock as measured by the digital lock detect circuitry.

This is enabled by the mute-till-lock detect (MTLD) bit in the

control latch.

RFOUTA

RFOUTB

VCO

BUFFER/

DIVIDE-BY-2

Figure 15. Output Stage ADF4360-2

Rev. B | Page 11 of 24

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