RF5117CPCBA datasheet(5/12 Pages) RFMD

5 / 12 page

2-577

RF5117C

Rev A5 060517

The RF5117C can be used with an IEEE802.11g modulation with a few modifications. Pin 2 should not be connected to

ground and a 4.7k

Ω resistor should be placed on the V

REG1 line. This is done on the evaluation board by cutting the

VREG1 trace and placing the resistor on the open line. All other components should not be modified and the IEEE802.11g

schematic should be followed as closely as possible.

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 RF5117C has primarily been characterized with a voltage on VREG1 and VREG2 of 2.7VDC. However, the RF5117C

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.

RF5117CPCBA bảng dữ liệu(PDF) 5 Page - RF Micro Devices