LT5521 Very High Linearity Active Mixer FEATURES DESCRIPTIO n Wideband Output Frequency Range to 3.7GHz The LT 5521 is a very high linearity mixer optimized for n +24.2dBm IIP3 at 1.95GHz RF Output low distortion and low LO leakage applications. The chip n Low LO Leakage: 42dBm includes a high speed LO buffer with single-ended input n Integrated LO Buffer: Low LO Drive Level and a double-balanced active mixer. The LT5521 requires n Single-Ended LO Drive only 5dBm LO input power to achieve excellent distor- n Wide Single Supply Range: 3.15V to 5.25V tion and noise performance, while reducing external drive n Double-Balanced Active Mixer circuit requirements. The LO buffer is internally 50W n Shutdown Function matched for wideband operation. n 16-Lead (4mm 4mm) QFN Package With a 250MHz input, a 1.7GHz LO and a 1.95GHz output frequency, the mixer has a typical IIP3 of +24.2dBm, U 0.5dB conversion gain and a 12.5dB noise figure. APPLICATIO S The LT5521 offers exceptional LO-RF isolation, greatly n Cellular, W-CDMA, PHS and UMTS Infrastructure reducing the need for output filtering to meet LO suppres- n Cable Downlink Infrastructure sion requirements. n Wireless Infrastructure n Fixed Wireless Access Equipment The device is designed to work over a supply voltage range n High Linearity Mixer Applications from 3.15V to 5.25V. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Fundamental, 3rd Order LO INPUT Intermodulation Distortion 5dBm vs Input Power 6.8pF 20 LO GND 0 110 BPF 4:1 82pF P 1nF FUND + + 2.7nH IN OUT IF 20 1:1 INPUT 6.8pF BPF 10pF IN OUT 40 RF PA IM3 OUTPUT 2.7nH 1nF 82pF 110 60 BIAS f = 250MHz 1nF IF f = 1.7GHz LO V V V EN CC CC CC 80 f = 1.95GHz RF 5V DC P = 5dBm LO T = 25C A 1F 100 14 12 10 8 6 4 2 0 2 4 6 5521 TA01 P (dBm) IN 5521 TA02 5521f 1 OUTPUT POWER (dBm) U ULT5521 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Power Supply Voltage ........................................... 5.5V TOP VIEW ORDER PART Enable Voltage ............................... 0.2V to V + 0.2V NUMBER CC LO Input Power ................................................ +10dBm 16 15 14 13 LT5521EUF + LO Input DC Voltage ..................................... 0V to 1.5V GND 1 12 OUT + IN 2 11 GND IF Input Power ................................................. +10dBm 17 IN 3 10 GND Difference Voltage Across Output Pins ................ 1.5V GND 4 9 OUT Maximum Pin 2 or Pin 3 Current ......................... 34mA UF PART 5 6 7 8 Operating Ambient Temperature Range .. 40 C to 85 C MARKING Storage Temperature Range ................. 65 C to 125 C UF PACKAGE 16-LEAD (4mm 4mm) PLASTIC QFN Maximum Junction Temperature .......................... 125 C 5521 T = 125 C, q = 37 C/W JMAX JA EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. DC ELECTRICAL CHARACTERISTICS V = 5V, EN = 2.9V, T = 25 C unless otherwise noted. CC A Test circuit shown in Figure 1. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Voltage 3.15 5.25 V Supply Current 82 98 mA Shutdown Current EN = 0.2V 20 100 m A Enable (EN) Low = Off, High = On Enable Mode EN = High 2.9 V Disable Mode EN = Low 0.2 V Enable Current EN = 5V 137 m A Shutdown Enable Current EN = 0.2V 0.1 m A Turn-On Time (Note 3) 200 ns Turn-Off Time (Note 4) 200 ns LO Voltage (Pin 15) Internally Biased 0.96 V Input Voltage (Pins 2, 3) V = 5V, Internally Biased 2.20 V CC V = 3.3V, Internally Biased 0.46 V CC AC ELECTRICAL CHARACTERISTICS V = 5V, EN = 2.9V, T = 25 C unless otherwise noted. CC A Test circuit shown in Figure 1. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS LO Frequency Range 10 to 4000 MHz Input Frequency Range 10 to 3000 MHz Output Frequency Range 10 to 3700 MHz LO Input Power 5 1 dBm LO Return Loss Z = 50W , f = 1700MHz 12 dB O LO Output Return Loss Requires Matching 12 dB Input Return Loss (Pins 2, 3) Requires Matching 15 dB 5521f 2 EN GND V LO CC V GND CC V GND CC U W U U WWW