RF2494

Preliminary 8 Typical Applications • Part of 2.4GHz IEEE802.11b WLANs • Digital Communication Systems RF2494 HIGH FREQUENCY LNA/MIXER • WLAN or Wireless Local Loop • Portable Battery-Powered Equipment • Spread-Spectrum Communication Systems • UHF Digital and Analog Receivers Product Description The RF2494 is a monolithic integrated UHF receiver front end suitable for 2.4GHz ISM band applications. The IC contains all of the required components to implement the RF functions of the receiver except for the passive filtering and LO generation. It contains an LNA (low-noise amplifier), a second RF amplifier and a doubly balanced mixer. The output of the LNA is made available as an output to permit the insertion of a bandpass filter between the LNA and the RF/Mixer section. The mixer outputs can be selectively disabled to allow for the IF filter to be used in the transmit mode. .80 .65 1.00 0.85 .60 .24 typ 4.00 sq. .65 .30 4 PLCS 2 .35 .23 1.85 1.55 sq. 12° max .05 .01 .75 .50 .65 .23 .13 4 PLCS Dimensions in mm. NOTES: 1 2 Shaded Pin is Lead 1. Dimension applies to plated terminal and is measured between 0.02 mm and 0.25 mm from terminal end. 8 FRONT-ENDS 4 5 3 Pin 1 identifier must exist on top surface of package by identification mark or feature on the package body. Exact shape and size is optional. Package Warpage: 0.05 max. Die thickness allowable: 0.305 mm max. Optimum Technology Matching® Applied Package Style: LCC, 16-Pin, 4x4 üSi Bi-CMOS Si BJT GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features • Single 2.7V to 3.6V Power Supply • 2400MHz to 2500MHz Operation • Two Gain Settings: 28dB or 12dB • 4.5dB Cascaded NF, High Gain Mode • 20mA DC Current Consumption • Input IP3: -23dBm or -8dBm 16 PD 1 VCC1 2 VCC2 3 MIX OUT- 4 5 MIX OUT+ Bias Circuits 15 GS 14 13 12 NC LNA LNA OUT 11 NC 10 MIX IN 9 GND3 LNA IN VCC4 RF AMP 6 LO IN 7 RX EN 8 VCC3 Ordering Information RF2494 High Frequency LNA/Mixer RF2494 PCBA-H Fully Assembled Evaluation Board (2.5GHz) Functional Block Diagram RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev A0 010730 8-53 RF2494 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Preliminary Rating -0.5 to 3.6 +6 -40 to +85 -40 to +150 Unit VDC dBm °C °C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Parameter Overall RF Frequency Range IF Frequency Range Cascade Gain Cascade IP3 Cascade Noise Figure Input P1dB Specification Min. Typ. Max. 2400 to 2500 374 28 15 -22 -8 4.5 18 -28 -14 2.3 7 2:1 -3 -3 10 -6 22 50 10 50 -17 18 4 -15 -10 42 15 0 Unit Condition T = 25°C, VCC =3V, RF=2442 MHz, LO=2068MHz, -10dBm 10 26 13 -29 500 31 17 -19 MHz MHz dB dB dBm dBm dB dB dBm dBm dB dB dBm dBm dB dB dB Ω dB Ω dBm dB kΩ dBm dB dB IF=374MHz, GAIN SEL=1 IF=374MHz, GAIN SEL=0 Referenced to the input, GAIN SEL = 1 Referenced to the input, GAIN SEL = 0 Single sideband, GAIN SEL = 1 Single sideband, GAIN SEL = 0 GAIN SEL = 1 GAIN SEL = 0 GAIN SEL = 1 GAIN SEL = 0 No external matching GAIN SEL = 1 GAIN SEL = 0 GAIN SEL = 1 GAIN SEL = 0 8 FRONT-ENDS LNA Noise Figure Input VSWR Input IP3 Gain Reverse Isolation Output Impedance RF Amp and Mixer Noise Figure Input Impedance Input IP3 Conversion Power Gain Output Impedance Single sideband With Current Combiner (1kΩ between open collectors and 250 Ω single ended load) Open Collector LO Input LO Level LO to RF Rejection LO to IF Rejection LO Input VSWR LO input to LNA input LO input to IF output 2:1 VCC -0.3 400 100 2.7 15 8 3.3 17 17 10 0.2 300 1000 200 3.6 26 26 16 1 V mV nS nS V mA mA mA µA Voltage at the input of RX EN, PD and GAIN SEL From PD Going high. From RX EN Going high. PD = “1” Power Down Control Logic Controls “ON” Logic Controls “OFF” Turn on Time Turn on Time Power Supply Voltage Current Consumption GAIN SEL=1, RX EN =1, PD=1 GAIN SEL=0, RX EN =1, PD=1 GAIN SEL=X, RX EN=0, PD=1 GAIN SEL=X, RX EN=X, PD =0 8-54 Rev A0 010730 Preliminary Pin 1 2 Function PD VCC1 Description The power enable pin. When PD is >VCC - 300mV, the part is biased on. When PD is 22pF is recommended. To minimize the noise figure it is recommended to have a bandpass filter before this input. This will prevent the noise at the image frequency from being converted to the IF. See pin 10. See pin 10. VCC3 MIX IN GND3 11 12 NC NC Not connected. Not connected. Rev A0 010730 8-55 FRONT-ENDS 6 LO IN RF2494 Pin 13 14 Function LNA OUT VCC4 Description RF signal output for external 50 Ω filtering.The use of a filter here is optional but does provide for lower noise floor and better out-of-band rejection. Supply voltage for the LNA. This pin should be bypassed with a 10 pF capacitor to ground as close to the pin as possible. The shunt inductance from this pin to ground via the supply decoupling must be tuned to match the LNA output to 50 Ω at the desired operating frequency. Preliminary Interface Schematic See pin 14. Microstrip EXTERNAL DECOUPLING VCC4 P2 LNA IN BIAS -16 dB P15 LNA OUT P1 GAIN SEL 15 16 GS LNA IN LNA gain control. When GAIN SEL is >VCC - 300mV, LNA gain is at 10 dB. When GAIN SEL is