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| Electrical Specifications Subject to Change FEATURES n n n n n n n n n n n n n LTC5543 2.3GHz to 4GHz High Dynamic Range Downconverting Mixer DESCRIPTION The LTC(R)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. High Dynamic Range Downconverting Mixer Family PART# LTC5540 LTC5541 LTC5542 LTC5543 RF RANGE 600MHz -1.3GHz 1.3GHz - 2.3GHz 1.6GHz - 2.7GHz 2.3GHz - 4GHz LO RANGE 700MHz - 1.2GHz 1.4GHz - 2.0GHz 1.7GHz - 2.5GHz 2.4GHz - 3.6GHz 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 50 Single-Ended RF and LO Inputs LO Inputs 50 Matched when Shutdown High Isolation LO Switch 0dBm LO Drive Level High LO-RF and LO-IF Isolation Small Solution Size 20-Lead (5mm x 5mm) QFN package APPLICATIONS n n Wireless Infrastructure Receivers (LTE, WiMAX, WCS) High Dynamic Range Downmixer Applications 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. TYPICAL APPLICATION Wideband Receiver 1nF VCCIF 3.3V or 5V 1nF 150nH IF IMAGE BPF LNA 0.8pF + 190MHz SAW IF AMP 190MHz BPF ADC 9.0 8.9 2.7pF GC (dB) Wideband Conversion Gain, IIP3 and NF vs IF Output Frequency 26 IIP3 24 22 IIP3 (dBm), SSB NF (dB) 20 18 16 GC 14 12 NF 10 8 165 175 185 195 205 215 IF OUTPUT FREQUENCY (MHz) 6 225 1F 22pF 150nH IF - IF LTC5543 LO2 SYNTH 2 ALTERNATE LO FOR FREQUENCY-HOPPING 2.7pF fLO = 2725MHz 8.8 PLO = 0dBm RF = 2535 35MHz 8.7 TEST CIRCUIT IN FIGURE 1 8.6 8.5 8.4 8.3 RF 2500MHz TO 2570MHz 1.2nH RF LO SHDN (0V/3.3V) SHDN BIAS VCC2 VCC1 22pF VCC3 LO1 LOSEL LO SELECT (0V/3.3V) 8.2 SYNTH 1 LO 2725MHz 5543 TA01 8.1 8.0 155 VCC 3.3V 1F 5543 TA02 5543p LINEAR TECHNOLOGY CONFIDENTIAL 1 |
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