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RF3857TR7 Datasheet(PDF) 4 Page - RF Micro Devices |
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RF3857TR7 Datasheet(HTML) 4 Page - RF Micro Devices |
4 / 11 page 4 of 11 RF3857 DS110616 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. Pin Function Description Interface Schematic 1GAIN SEL1 This pin selects high gain and bypass modes for Amplifier 1. Gain Sel1<0.8V, Amp1 high gain. Gain Sel1>1.8V, Amp1 bypass. 2GND Amplifier 1 ground connection. For best performance, keep traces physi- cally short and connect immediately to ground plane. 3RFOUT1 Amplifier 1 output pin. This pin is an open-collector output. It must be biased to VCC through a choke or matching inductor. This pin is matched to 50 with the network shown in the evaluation board schematic. 4N/C No internal connection. 5RFIN1 RF input pin for amplifier 1. This part is designed such that 50 is the opti- mal source impedance for best noise figure. Best noise figure is achieved with only a series capacitor on the input. 6GND Isolation ground connection. Can be grounded or not connected. 7GND See pin 7. 8RFIN2 RF input pin for amplifier 2. See pin 5. 9N/C No internal connection. 10 RFOUT2 Amplifier 2 output pin. See pin 3. 11 GND Amplifier 2 ground connection. See pin 2. 12 GAIN SEL2 Selects high gain and bypass modes for Amplifier 2. See pin 1. 13 VREF2 Bias control for amplifier 2. An external resistor can be used to set the bias current for any VREF voltage. 14 N/C No internal connection. 15 N/C No internal connection. 16 VREF1 Bias control for amplifier 1. See pin 13. RF IN RF OUT To Bias Circuit VBIAS |
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