MIXER CONVERSION GAIN (dB) LT5500 1.8GHz to 2.7GHz Receiver Front End DESCRIPTIO FEATURES 1.8V to 5.25V Supply The LT 5500 is a receiver front end IC designed for low Dual LNA Gain Setting: +13.5dB/14dB at 2.5GHz voltage operation. The chip contains a low noise amplifier Double-Balanced Mixer (LNA), a Mixer and an LO buffer. The IC is designed to Internal LO Buffer operate over a power supply voltage range from 1.8V to LNA Input Internally Matched 5.25V. Low Supply Current: 23mA The LNA can be set to either high gain or low gain mode. Low Shutdown Current: 2A At 2.5GHz, the high gain mode provides 13.5dB gain and 24-Lead Narrow SSOP Package a noise figure (NF) of 4dB. The LNA in low gain mode provides 14dB gain and an IIP3 of +8dBm at 2.5GHz. U APPLICATIO S The mixer has 5dB of conversion gain and an IIP3 of 2.5dBm at 2.5GHz, with 10dBm LO input power. IEEE 802.11 and 802.11b DSSS and FHSS , LTC and LT are registered trademarks of Linear Technology Corporation. High Speed Wireless LAN All other trademarks are the property of their respective owners. Wireless Local Loop TYPICAL APPLICATIO GAIN ENABLE SELECT 100pF 100pF 2V LNA Gain (High Gain Mode) 100pF 2 and Mixer Conversion Gain EN LT5500 GS RF INPUT L4 FILTER 14.0 6.0 L2 f = 2.5GHz LNA IN LNA OUT RF RF T = 25C 13.9 5.8 A INPUT GND 13.8 5.6 C4 LO LNA GND 13.7 5.4 13.6 5.2 L3 INTERSTAGE C17 + 13.5 5.0 LO FILTER 2V LO INPUT 13.4 4.8 V CC 100pF 13.3 4.6 1F 1nF 4 13.2 4.4 L9 LO MIX GND MIX IN 13.1 4.2 RF IF C23 13.0 4.0 + L5 1.5 2 3.5 4 5.5 IF IF 2.5 3 4.5 5 V (V) CC T2 5500 TA02 8:1 2V IF OUTPUT L7 100pF 5500 F01 Figure 1. 2.5GHz Receiver. Interstage Filter is Optional 5500f 1 LNA GAIN (dB) U ULT5500 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER I FOR ATIO (Note 1) Power Supply Voltage ........................................... 5.5V TOP VIEW ORDER PART NUMBER LNA RF Input Power ............................................ 5dBm 1 GS EN 24 Mixer RF Input Power ........................................ 10dBm 2 GND V 23 CC LT5500EGN 3 LNA OUT LO Input Power (Note 2) ................................... 10dBm LNA IN 22 4 V GND 21 All Other Pins......................................................... 5.5V CC 5 GND LNA GND 20 Operating Ambient 6 LO LNA GND 19 Temperature Range ............................... 40C to 85C + 7 LO LNA GND 18 Storage Temperature Range ................ 65C to 150C 8 V LNA GND 17 CC Lead Temperature (Soldering, 10 sec)................. 300C 9 GND V 16 CC 10 MIX IN MIX GND 15 11 GND GND 14 + 12 IF IF 13 GN PACKAGE 24-LEAD PLASTIC SSOP T = 150C, = 85C/W JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS (Test circuit shown in Figure 3 for 1.8GHz application) V = 3V DC, CC LNA: f = 1.8GHz, Mixer: f = 1.8GHz, f = 1.52GHz, P = 10dBm, T = 25C, unless otherwise noted. (Notes 3, 4) LNA IN MIX IN LO LO A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS LNA High Gain: EN = 1.35V, GS = 1.35V Frequency Range (Note 3) 1.8 to 2.7 GHz Forward Gain 15.5 18.5 dB Reverse Gain (Isolation) 39 dB Noise Figure Terminated 50 Source 2.5 dB Input Return Loss No External Matching 10.5 dB Output Return Loss With External Matching 15 dB Input 1dB Compression 24 dBm Input 3rd Order Intercept Two Tone Test, f = 2MHz 18 12 dBm LNA Low Gain: EN = 1.35V, GS = 0.3V Frequency Range (Note 4) 1.8 to 2.7 GHz Forward Gain 13 10 dB Reverse Gain (Isolation) 34 dB Noise Figure 16.5 dB Input 1dB Compression 0 dBm Input 3rd Order Intercept Two Tone Test, f = 2MHz 4.5 9 dBm Mixer: EN = 1.35V, GS = 1.35V RF Frequency Range (Note 4) 1.8 to 2.7 GHz Conversion Gain 5.5 8.5 dB SSB Noise Figure Terminated 50 Source 7.5 dB Input P1dB 13 dBm Input 3rd Order Intercept Two Tone Test, f = 2MHz 6 2.5 dBm 5500f 2 U WU U WWW