Electrical Specifications Subject to Change LTC5543 2.3GHz to 4GHz High Dynamic Range Downconverting Mixer DESCRIPTION FEATURES n n n n n n n n n n n n n Conversion Gain: 8.4dB at 2500MHz IIP3: 24.5dBm at 2500MHz Noise Figure: 10.2dB at 2500MHz High Input P1dB 3.3V Supply, 660mW Power Consumption Shutdown Pin 50Ω Single-Ended RF and LO Inputs LO Inputs 50Ω Matched when Shutdown High Isolation LO Switch 0dBm LO Drive Level High LO-RF and LO-IF Isolation Small Solution Size 20-Lead (5mm × 5mm) QFN package The LTC®5543 is part of a family of high dynamic range passive downconverting mixers covering the 700MHz to 4GHz frequency range. The LTC5543 is optimized for 2.3GHz to 4GHz RF applications. The LO frequency must fall within the 2.4GHz to 3.6GHz range for optimum performance. A typical application is a LTE or WiMAX receiver with a 2.3GHz to 2.7GHz RF input and high-side LO. The LTC5543 is designed for 3.3V operation, however; the IF amplifier can be powered by 5V for the highest P1dB. An integrated SPDT LO switch with fast switching accepts two active LO signals, while providing high isolation. The LTC5543’s high conversion gain and high dynamic range enable the use of lossy IF filters in high-selectivity receiver designs, while minimizing the total solution cost, board space and system-level variation. APPLICATIONS n n Wireless Infrastructure Receivers (LTE, WiMAX, WCS) High Dynamic Range Downmixer Applications High Dynamic Range Downconverting Mixer Family L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PART# RF RANGE LO RANGE LTC5540 600MHz –1.3GHz 700MHz – 1.2GHz LTC5541 1.3GHz – 2.3GHz 1.4GHz – 2.0GHz LTC5542 1.6GHz – 2.7GHz 1.7GHz – 2.5GHz LTC5543 2.3GHz – 4GHz 2.4GHz – 3.6GHz TYPICAL APPLICATION Wideband Receiver 190MHz SAW 1nF VCCIF 3.3V or 5V 1μF 22pF IF AMP 1nF 150nH 150nH + Wideband Conversion Gain, IIP3 and NF vs IF Output Frequency 190MHz BPF 9.0 ADC 2.7pF LTC5543 IF 1.2nH LNA LO2 RF ALTERNATE LO FOR FREQUENCY-HOPPING LO 0.8pF SYNTH 2 GC (dB) RF 2500MHz TO 2570MHz IMAGE BPF IIP3 fLO = 2725MHz 8.8 PLO = 0dBm RF = 2535 ±35MHz 8.7 TEST CIRCUIT IN FIGURE 1 8.6 22 20 18 8.5 8.4 16 GC 14 8.3 2.7pF SHDN (0V/3.3V) BIAS SHDN VCC2 VCC 3.3V 1μF VCC1 22pF VCC3 LO1 LOSEL LO SELECT (0V/3.3V) 12 8.2 SYNTH 1 LO 2725MHz 24 NF 8.1 8.0 155 5543 TA01 IIP3 (dBm), SSB NF (dB) IF – IF 26 8.9 10 8 165 175 185 195 205 215 IF OUTPUT FREQUENCY (MHz) 6 225 5543 TA02 5543p LINEAR TECHNOLOGY CONFIDENTIAL 1