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Electrical Specifications Subject to Change
FEATURES
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LTC5541 1.3GHz to 2.3GHz High Dynamic Range Downconverting Mixer DESCRIPTION
The LTC(R)5541 is part of a family of high dynamic range passive downconverting mixers covering the 700MHz to 4GHz frequency range. The LTC5541 is optimized for 1.3GHz to 2.3GHz RF applications. The LO frequency must fall within the 1.4GHz to 2.0GHz range for optimum performance. A typical application is a LTE or W-CDMA receiver with a 1.7GHz to 2.2GHz RF input and low-side LO. The LTC5541 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 LTC5541'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: 7.8dB at 1950MHz IIP3: 26.4dBm at 1950MHz Noise Figure: 9.6dB at 1950MHz Configurable for 13dBm Input P1dB 3.3V Supply, 630mW 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
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Wireless Infrastructure Receivers (LTE, W-CDMA. TD-SCDMA, UMTS, GSM1800) 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 2.2pF LNA RF LO IF IF - 22pF LTC5541 LO2 GC (dB) SYNTH 2 ALTERNATE LO FOR FREQUENCY-HOPPING 22pF SHDN (0V/3.3V) SHDN BIAS VCC2 VCC 3.3V 1F VCC1 22pF VCC3 LO1 LOSEL LO SELECT (0V/3.3V) SYNTH 1 LO 1760MHz
5541 TA01
190MHz SAW IF AMP
190MHz BPF ADC 9.0 8.8
Wideband Conversion Gain, IIP3 and NF vs IF Output Frequency
28 IIP3 26 24 IIP3 (dBm), SSB NF (dB) 22 20 18 GC 16 14 12 10 NF
1F
22pF
150nH
fLO = 1760MHz 8.6 PLO = 0dBm RF = 1950 50MHz 8.4 TEST CIRCUIT IN FIGURE 1 8.2 8.0 7.8 7.6 7.4 7.2
RF 1920MHz TO 1980MHz
7.0 8.0 140 150 160 170 180 190 200 210 220 230 240 IF OUTPUT FREQUENCY (MHz)
5541 TA02
5541p
1
LTC5541 ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW IFBIAS IFGND 15 LO2 21 GND 14 VCC3 13 GND 12 GND 11 LO1 6 VCC2 7 LOBIAS 8 VCC1 9 10 LOSEL GND GND IF+ IF-
Mixer Supply Voltage (VCC1, VCC2)...........................3.8V LO Switch Supply Voltage (VCC3).............................3.8V IF Supply Voltage (IF+, IF -) ......................................5.5V Shutdown Voltage (SHDN) ................-0.3V to VCC +0.3V LO Select Voltage (LOSEL)................-0.3V to VCC +0.3V LO1, LO2 Input Power (1GHz to 3GHz) ...................9dBm LO1, LO2 Input DC Voltage ....................................0.5V RF Input Power (1GHz to 3GHz) ...........................15dBm RF Input DC Voltage ............................................... 0.1V Operating Temperature Range .................-40C to 85C Storage Temperature Range .................. -65C to 150C Junction Temperature (TJ) .................................... 150C
20 19 18 17 16 NC 1 RF 2 CT 3 GND 4 SHDN 5
UH PACKAGE 20-LEAD (5mm 5mm) PLASTIC QFN TJMAX = 150C, JA = 34C/W EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH LTC5541IUH#PBF TAPE AND REEL LTC5541IUH#TRPBF PART MARKING 5541 PACKAGE DESCRIPTION 20-Lead (5mm x 5mm) Plastic QFN TEMPERATURE RANGE -40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
AC ELECTRICAL CHARACTERISTICS
PARAMETER LO Input Frequency Range RF Input Frequency Range IF Output Frequency Range RF Input Return Loss LO Input Return Loss IF Output Return Loss LO Input Power LO to RF Leakage LO to IF Leakage LO Switch Isolation RF to LO Isolation RF to IF Isolation Low-Side LO High-Side LO CONDITIONS
VCC = 3.3V, VCCIF = 3.3V, SHDN = Low, TA = 25C, PLO = 0dBm, unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
MIN TYP 1400 to 2000 1600 to 2300 1300 to 1800 5 to 500 >12 >12 >12 fLO = 1400MHz to 2000MHz fLO = 1400MHz to 2000MHz fLO = 1400MHz to 2000MHz LO1 Selected, 1400MHz < fLO < 2000MHz LO2 Selected, 1400MHz < fLO < 2000MHz fRF = 1300MHz to 2300MHz fRF = 1300MHz to 2300MHz -4 0 <-32 <-31 52 50 52 33 4 MAX UNITS MHz MHz MHz MHz dB dB dB dBm dBm dBm dB dB dB dB
5541p
Requires External Matching ZO = 50, 1300MHz to 2300MHz ZO = 50, 1400MHz to 2000MHz
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