RF5117PCBA datasheet(5/10 Pages) RFMD

5 / 10 page

2-577

RF5117

Rev A7 041007

Power sensing is implemented with the PWR SEN and PWR REF lines. The outputs of these pins are transistor collec-

tors and need to be pulled up to the supply through a resistor. PWR REF provides an output current proportional to the

output stage bias current, and PWR SEN provides an output current proportional to the total (RF and bias) current of the

output stage. The pull-up resistors convert these currents to voltages, and the voltage difference between these two pins

is proportional to the RF current. See the graph, “VREF-VSENSE versus POUT”, for the response of this signal. This differ-

ence signal can be fed to a power control circuit elsewhere in the end product, or it can be processed at the PA with addi-

tional circuitry and used to adjust the VREG voltage(s) to implement automatic level control. Contact RFMD Sales or

Applications Engineering for additional data and guidance in using this feature.

The RF5117 has primarily been characterized with a voltage on VREG1 and VREG2 of 2.7VDC. However, the RF5117 will

operate from a wide range of control voltages. If you prefer to use a control voltage that is significantly different than

2.7VDC, contact RFMD Sales or Applications Engineering for additional data and guidance.

RF5117PCBA Fiches technique(PDF) 5 Page - RF Micro Devices