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RFFM4200PCK-410 Datasheet(PDF) 5 Page - RF Micro Devices |
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RFFM4200PCK-410 Datasheet(HTML) 5 Page - RF Micro Devices |
5 / 15 page 5 of 15 RFFM4200 DS121008 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com. Theory of Operation and Applications The RFFM4200 is a single-chip integrated front-end module (FEM) for high performance WiFi applications in the 2.4GHz to 2.5GHz ISM band. The FEM greatly reduces the number of external components minimizing footprint and assembly cost of the overall 802.11b/g/n solution. The RFFM4200 has an integrated b/g/n power amplifier, a power Detector, and TX filtering and a Switch, which is capable of switching between WiFi RX, WiFi TX operations. The device is manufactured using InGaP HBT and pHEMT processes on a 6mm x 6mm x 0.95mm laminate package. The module meets or exceeds the RF front-end needs of the 802.11b/g/n WiFi RF systems. The RFFM4200 is a very easy part to implement. To reduce the design and optimization pro- cess on the customer application, the evaluation board layout should be copied as close as possible, in particular the ground and via configurations. Gerber files of RFMD PCBA designs can be provided upon request. The supply voltage lines should present an RF short to the FEM by using bypass capacitors on the VCC traces. To simplify bias conditions, the RFFM4200 requires a single positive supply voltage (VCC), a positive current control bias (VREG) supply, and a positive supply for switch con- trol. The built-in Power Detector of the RFFM4200 can be used as power monitor in the system. All inputs and outputs are inter- nally matched to 50Ω. Transmit Path The RFFM4200 has a typical gain of 34dB form 2.4GHz to 2.5GHz, and delivers 25.5dBm typical output power in 11n HT20 MCS7 and 26dBm typical in 11g 54Mbps. The RFFM4200 requires a single positive supply voltage of 5.0V to operate at full specifications. The VREG pin requires a regulated supply at 2.9V to maintain nominal bias current. Out of Band Rejection The RFFM4200 contains a low pass filtering (LPF) to attenuate the 2nd Harmonics to -47dBm/MHz (typical), to meet the out of band rejection requirements of the system for FCC specification. Receive Path The RX path has a 50Ω single-ended port. The receive port return loss is 9.6dB minimum. In this mode, the FEM has an Inser- tion loss of 0.8dB and 30dB (typical) isolation to TX port. RFFM4200 Biasing Instructions to the Evaluation Board 802.11b/g/n Transmit: 1. Connect the FEM to a signal generator at the input and a spectrum analyzer at the output. Set the Pin at signal generator is at -20dBm. 2. Bias VCC to 5.0V first with VREG=0.0V. If available, enable the current limiting function of the power supply to 750mA. 3. Refer to switch operational truth table to set the control lines at the proper levels for WiFi TX.• Turn on VREG to 2.9V (typ). On VREG (of evaluation board), a regulated supply is recommended. Be extremely careful not to exceed 3.0V on the VREG pin or the part may exceed device current limits. 4. Turn on Pdown to 2.9V (typ). PDOWN pin can be tied to VREG supply. NOTE: It is important to adjust the VCC voltage source so that +5V is measured at the board; and the +2.9V of VREG is measured at the board. The high collector currents will drop the collector voltage significantly if long leads are used. Adjust the bias voltage to compensate. 5. Turn on RF of signal generator and gradually increase power level to the rated power. CAUTION: If the input signal exceeds the rated power, the RFFM4200 evaluation board can be permanently damaged. 6. To turn off FEM, turn off RF power of signal generator; then PDOWN, VREG, and VCC. 802.11b/g/n Receive: • To receive WiFi set the switch control lines per the truth table. |
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Similar Description - RFFM4200PCK-410 |
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