RF5117CPCBA datasheet(6/12 Pages) RFMD

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RF5117C

Rev A6 DS071018

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

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 VREG1 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 collectors 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 difference signal can be fed to a power

control circuit elsewhere in the end product, or it can be processed at the PA with additional 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 oper-

ate from a wide range of control voltages. If you prefer to use a control voltage that is significantly different than 2.7VDC, con-

tact RFMD Sales or Applications Engineering for additional data and guidance.

RF5117CPCBA bảng dữ liệu(PDF) 6 Page - RF Micro Devices