LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator FEATURES DESCRIPTIO Frequency Range: 1.5GHz to 2.5GHz The LT 5515 is a 1.5GHz to 2.5GHz direct conversion High IIP3: 20dBm at 1.9GHz quadrature demodulator optimized for high linearity re- High IIP2: 51dBm at 1.9GHz ceiver applications. It is suitable for communications Noise Figure: 16.8dB at 1.9GHz receivers where an RF signal is directly converted into I Conversion Gain: 0.7dB at 1.9GHz and Q baseband signals with bandwidth up to 260MHz. I/Q Gain Mismatch: 0.3dB The LT5515 incorporates balanced I and Q mixers, LO I/Q Phase Mismatch: 1 buffer amplifiers and a precision, high frequency quadra- Shutdown Mode ture generator. 16-Lead QFN 4mm 4mm Package In an RF receiver, the high linearity of the LT5515 provides with Exposed Pad excellent spur-free dynamic range, even with fixed gain front end amplification. This direct conversion receiver U can eliminate the need for intermediate frequency (IF) APPLICATIO S signal processing, as well as the corresponding require- Cellular/PCS/UMTS Infrastructure ments for image filtering and IF filtering. Channel filtering High Linearity Direct Conversion I/Q Receiver can be performed directly at the outputs of the I and Q High Linearity I/Q Demodulator channels. These outputs can interface directly to channel- RF Power Amplifier Linearization select filters (LPFs) or to a baseband amplifier. LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO I/Q Output Power, IM2, IM3 5V vs RF Input Power BPF BPF V + CC LT5515 20 RF LNA + LPF I OUT 0 VGA P OUT I OUT 0 20 RF IM3 DSP 40 + IM2 LO LO INPUT + LPF Q OUT 60 T = 25C A 0/90 VGA P = 5dBm LO Q OUT f = 1901MHz 80 LO 90 f = 1899.9MHz RF1 LO f = 1900.1MHz RF2 100 ENABLE EN 16 12 8 4 0 48 5515 F01 RF INPUT POWER (dBm) 5515 TA01 Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure 5515fa 1 P , IM2, IM3 (dBm/TONE) OUT U ULT5515 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Power Supply Voltage ............................................ 5.5V NUMBER Enable Voltage ...................................................... 0, V CC 16 15 14 13 + LO to LO Differential Voltage ............................... 2V LT5515EUF GND 1 12 V CC (+10dBm Equivalent) + RF 2 11 LO 17 + + RF to RF Differential Voltage ................................ 2V RF 3 10 LO (+10dBm Equivalent) GND 4 9 V CC 5 6 7 8 UF PART Operating Ambient Temperature ..............40C to 85C MARKING Storage Temperature Range ................. 65C to 125C Maximum Junction Temperature .......................... 125C UF PACKAGE 5515 16-LEAD (4mm 4mm) PLASTIC QFN EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB T = 125C, = 38C/W JMAX JA Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: