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| Electrical Specifications Subject to Change FEATURES n n n n n n n n n n n n n n LTC5540 0.6GHz to 1.3GHz High Dynamic Range Downconverting Mixer DESCRIPTION The LTC(R)5540 is part of a family of high dynamic range passive downconverting mixers covering the 600MHz to 4GHz frequency range. The LTC5540 is optimized for 0.6GHz to 1.3GHz RF applications. The LO frequency must fall within the 0.7GHz to 1.2GHz range for optimum performance. A typical application is a LTE or GSM receiver with a 700MHz to 915MHz RF input and high-side LO. The LTC5540 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 LTC5540'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: 7.9dB at 900MHz IIP3: 25.9dBm at 900MHz Noise Figure: 9.9dB at 900MHz 17.7dB NF Under 5dBm Blocking High Input P1dB 3.3V Supply, 640mW 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, GSM, CDMA) 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+ CT RF 700MHz TO 915MHz 5.6pF LNA IMAGE BPF SHDN (0V/3.3V) SHDN BIAS VCC2 VCC 3.3V 1F VCC1 22pF VCC3 LO1 LOSEL LO SELECT (0V/3.3V) RF LO IF LTC5540 IF - LO2 190MHz SAW IF AMP 190MHz BPF ADC 16 15 14 100pF SYNTH 2 ALTERNATE LO FOR FREQUENCY-HOPPING 100pF SYNTH 1 LO 1090MHz 5540 TA01 Wideband Conversion Gain, IIP3 and NF vs RF Input Frequency 28 27 26 TA = +25C FIF = 190MHz FLO = FRF + FIF IIP3 25 24 23 22 21 GC 20 19 800 700 900 RF FREQUENCY (MHz) 18 1000 5540 TA01a 1F 22pF 150nH 1.5pF GC (dB), NF (dB) 13 12 11 10 9 8 7 6 600 NF 5540p LINEAR TECHNOLOGY CONFIDENTIAL 1 IIP3 (dBm) |
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