LT5516 800MHz to 1.5GHz Direct Conversion Quadrature Demodulator FEATURES DESCRIPTIO Frequency Range: 800MHz to 1.5GHz The LT 5516 is an 800MHz to 1.5GHz direct conversion High IIP3: 21.5dBm at 900MHz quadrature demodulator optimized for high linearity re- High IIP2: 52dBm ceiver applications. It is suitable for communications Noise Figure: 12.8dB at 900MHz receivers where an RF or IF signal is directly converted into Conversion Gain: 4.3dB at 900MHz I and Q baseband signals with bandwidth up to 260MHz. I/Q Gain Mismatch: 0.2dB The LT5516 incorporates balanced I and Q mixers, LO Shutdown Mode buffer amplifiers and a precision, high frequency quadra- 16-Lead QFN 4mm 4mm Package ture generator. with Exposed Pad In an RF receiver, the high linearity of the LT5516 provides 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- 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, IM3 vs 5V RF Input Power BPF BPF V + CC LT5516 RF 20 LNA + LPF I OUT VGA 0 I P OUT OUT 0 20 RF DSP 40 + LO LO INPUT IM3 + LPF V = 5v Q CC OUT 60 T = 25C A 0/90 VGA P = 10dBm LO Q OUT f = 901MHz LO 80 90 f = 899.9MHz RF1 LO f = 900.1MHz RF2 100 ENABLE EN 5516 F01 18 14 10 6 2 26 RF INPUT POWER (dBm) 5516 TA01 Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure 5516fa 1 P , IM3 (dBm/TONE) OUT U ULT5516 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 LT5516EUF GND 1 12 V CC + (+10dBm Equivalent) RF 2 11 LO 17 + + RF to RF Differential Voltage ................................ 2V RF 3 10 LO GND 4 9 V CC (+10dBm Equivalent) 5 6 7 8 Operating Ambient Temperature ..............40C to 85C UF PART Storage Temperature Range ................. 65C to 125C MARKING UF PACKAGE Maximum Junction Temperature .......................... 125C 16-LEAD (4mm 4mm) PLASTIC QFN 5516 EXPOSED PAD (PIN 17) IS GROUND (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: