LTC5585 Wideband IQ Demodulator with IIP2 and DC Offset Control FEATURES DESCRIPTION n 400MHz to 4GHz Operating Frequency The LTC 5585 is a direct conversion quadrature demodu- n High IIP3: 28.7dBm at 700MHz, 25.7dBm at 1.95GHz lator optimized for high linearity receiver applications in n High IIP2: 70dBm at 700MHz, 60dBm at 1.95GHz the 400MHz to 4GHz frequency range. It is suitable for n User Adjustable IIP2 Up to 80dBm communications receivers where an RF signal is directly n User Adjustable DC Offset Null converted into I and Q baseband signals with bandwidth n High Input P1dB: 16dBm at 1950MHz of 530MHz or higher. The LTC5585 incorporates balanced n I/Q Bandwidth of 530MHz or Higher I and Q mixers, LO buffer amplifiers and a precision, high n Image Rejection: 43dB at 1950MHz frequency quadrature phase shifter. The integrated on-chip n Noise Figure: 13.5dB at 700MHz broadband transformer provides a single-ended interface 12.7dB at 1.95GHz at the RF input with simple off-chip L-C matching. In ad- n Conversion Gain: 2.0dB at 700MHz dition, the LTC5585 provides four analog control voltage 2.4dB at 1.95GHz interface pins for IIP2 and DC offset correction, greatly n Single-Ended RF with On-Chip Transformer simplifying system calibration. n Shutdown Mode The high linearity of the LTC5585 provides excellent spur- n Operating Temperature Range (T ): 40C to 105C C free dynamic range for the receiver. This direct conversion n 24-Lead 4mm 4mm QFN Package demodulator can eliminate the need for intermediate fre- quency (IF) signal processing, as well as the corresponding APPLICATIONS requirements for image filtering and IF filtering. These n LTE/W-CDMA/TD-SCDMA Base Station Receivers I/Q outputs can interface directly to channel-select filters n Wideband DPD Receivers (LPFs) or to baseband amplifiers. n Point-To-Point Broadband Radios L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n High Linearity Direct Conversion I/Q Receivers n Image Rejection Receivers TYPICAL APPLICATION Direct Conversion Receiver with IIP2 and DC Offset Calibration 5V BPF LNA BPF RF V CC LPF VGA + INPUT RF I IIP2 vs IP2I, IP2Q Trim Voltage A/D I 120 I, 40C Q, 40C f = 700MHz RF I, 25C Q, 25C 110 I, 85C Q, 85C D/A I, 105C Q, 105C IP2 ADJUST 100 IP2 AND DC DC OFFSET OFFSET CAL 90 D/A 0 LO 80 LO INPUT LTC5585 90 70 D/A DC OFFSET 60 IP2 AND DC IP2 ADJUST OFFSET CAL 50 D/A 40 LPF VGA 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 + Q IP2I, IP2Q (V) ENABLE EN A/D Q 5585 G09 5585 TA01a 5585fb 1 For more information www.linear.com/LTC5585 IIP2 (dBm)LTC5585 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V Supply Voltage ................................... 0.3V to 5.5V CC V Voltage .................................................V 0.05V CAP CC 24 23 22 21 20 19 + + I , I , Q , Q , CMI, CMQ Voltage ........2.5V to V + 0.3V CC IP2Q 1 18 CMQ Voltage on Any Other Pin .................0.3V to V + 0.3V CC DCOQ 2 17 V CAP + LO , LO , RF Input Power ....................................20dBm DCOI 3 16 LO 25 + RF Input DC Voltage ............................................... 0.1V GND IP2I 4 15 LO Maximum Junction Temperature (T ) ............. 150C RF GND 5 14 JMAX GND 6 13 GND Operating Temperature Range (T ) ........ 40C to 105C C Storage Temperature Range .................. 65C to 150C 7 8 9 10 11 12 UF PACKAGE 24-LEAD (4mm 4mm) PLASTIC QFN T = 150C, = 7C/W JMAX JC EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC5585IUF PBF LTC5585IUF TRPBF 5585 24-Lead (4mm x 4mm) Plastic QFN 40C to 105C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: