IIP2 (dBm) LT5575 800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator FEATURES DESCRIPTION Input Frequency Range: 0.8GHz to 2.7GHz* The LT 5575 is an 800MHz to 2.7GHz direct conversion 50 Single-Ended RF and LO Ports quadrature demodulator optimized for high linearity High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz receiver applications. It is suitable for communications High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz receivers where an RF signal is directly converted into I Input P1dB: 13.2dBm at 900MHz and Q baseband signals with bandwidth up to 490MHz. I/Q Gain Mismatch: 0.04dB Typical The LT5575 incorporates balanced I and Q mixers, LO I/Q Phase Mismatch: 0.4 Typical buffer ampli ers and a precision, high frequency quadrature Low Output DC Offsets phase shifter. The integrated on-chip broadband transform- Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz ers provide 50 single-ended interfaces at the RF and LO Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz inputs. Only a few external capacitors are needed for its Very Few External Components application in an RF receiver system. Shutdown Mode The high linearity of the LT5575 provides excellent spur- 16-Lead QFN 4mm 4mm Package with free dynamic range for the receiver. This direct conversion Exposed Pad demodulator can eliminate the need for intermediate fre- quency (IF) signal processing, as well as the corresponding requirements for image ltering and IF ltering. Channel APPLICATIONS ltering can be performed directly at the outputs of the I Cellular/PCS/UMTS Infrastructure and Q channels. These outputs can interface directly to RFID Reader channel-select lters (LPFs) or to baseband ampli ers. High Linearity Direct Conversion I/Q Receiver , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Operation over a wider frequency range is possible with reduced performance. Consult the factory. TYPICAL APPLICATION Conversion Gain, NF, IIP3 and IIP2 High Signal-Level I/Q Demodulator for Wireless Infrastructure vs LO Input Power at 1900MHz +5V 35 70 IIP2 V LT5575 CC RF BPF BPF + LPF 30 60 INPUT I RF OUT LNA VGA A/D I 25 IIP3 50 OUT 0 20 40 DSB NF 15 30 LO LO INPUT 40C 10 20 25C 0/90 CONV 90 + LPF Q OUT 85C GAIN VGA A/D 5 10 Q OUT ENABLE EN 0 0 15 10 5 0 5 5575 TA01 LO INPUT POWER (dBm) 5575 TA01b 5575f 1 GAIN (dB), NF (dB), IIP3 (dBm)LT5575 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Power Supply Voltage ..............................................5.5V Enable Voltage ................................ 0.3V to V + 0.3V CC 16 15 14 13 LO Input Power ....................................................10dBm GND 1 12 V CC RF Input Power ....................................................20dBm RF 2 11 GND 17 RF Input DC Voltage ...............................................0.1V GND 3 10 LO LO Input DC Voltage ..............................................0.1V GND GND 4 9 Operating Ambient Temperature ..............40C to 85C 5 6 7 8 Storage Temperature Range ...................65C to 125C Maximum Junction Temperature .......................... 125C UF PACKAGE 16-LEAD (4mm 4mm) PLASTIC QFN T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB CAUTION: This part is sensitive to electrostatic discharge (ESD). It is very important that proper ESD precautions be observed when handling the LT5575. ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT5575EUF PBF LT5575EUF TRPBF 5575 16-Lead (4mm 4mm) QFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based nish parts. For more information on lead free part marking, go to: