RF5187PCBA datasheet(3/6 Pages) RFMD

3 / 6 page

Preliminary

2-75

RF5187

Rev A1 011016

Function

Description

Interface Schematic

1RF IN

RF input. This input is DC-coupled, so an external blocking capacitor is

required if this pin is connected to a DC path. An optimum match to

Ω is obtained by providing an external series capacitor of 2.4pF and

then a shunt capacitor of 2.4pF. Those values are typical for 2140MHz;

other values may be required for other frequencies.

2RF IN

Same as pin 1.

3PC

Power control pin. For obtaining maximum performance, the voltage on

this pin can be used to set correct bias level. In a typical application this

is implemented by a feedback loop. The feedback can be based on the

actual supply current of the device (i.e. maintaining a fixed current

level), or it can be based on the RF output power level to maintain a

fixed RF power level (Automatic Level Control loop). A voltage of 0.5V

or lower brings the part into power down state.

4VCC

Power supply pin for the bias circuits. External low frequency bypass

capacitors should be connected if no other low frequency decoupling is

nearby.

5RF OUT

RF output and bias for the output stage. The power supply for the out-

put transistor needs to be supplied to this pin. This can be done

through a quarter-wavelength microstrip line that is RF-grounded at the

other end, or through an RF inductor that supports the required DC cur-

rents. Optimum load impedance is achieved by providing a shunt

capacitor of 1.8pF and a series capacitor of 3.3pF. Those values are

typical for 2140MHz; other values may be required for other frequen-

cies. Since there are several output pins available (which are internally

connected), one pin can be used for connecting the bias, another for

connecting a (third) harmonic trap filter, and the other pins for the RF

output.

6RF OUT

Same as pin 5.

7RF OUT

Same as pin 5.

8RF OUT

Same as pin 5.

Pkg

Base

GND

Ground connection. The backside of the package should be connected

to the ground plane through a short path (i.e., vias under the device

may be required).

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