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LTC5584 - 30MHz to 1.4GHz IQ Demodulator with IIP2 and DC Offset Control

The LTC®5584 is a direct conversion quadrature demodulator optimized for high linearity receiver applications in the 30MHz to 1.4GHz frequency range. It is also usable in the 10MHz to 30MHz and 1.4GHz to 2GHz ranges with reduced performance. It is suitable for communications receivers where an RF signal is directly converted into I and Q baseband signals with bandwidth of 530MHz or higher. The LTC5584 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, high frequency quadrature phase shifter. In addition, the LTC5584 provides four analog control voltage interface pins for IIP2 and DC offset correction, greatly simplifying system calibration.

The high linearity of the LTC5584 provides excellent spurfree dynamic range for the receiver. This direct conversion demodulator can eliminate the need for intermediate frequency (IF) signal processing, as well as the corresponding requirements for image filtering and IF filtering. These I/Q outputs can interface directly to channel-select filters (LPFs) or to baseband amplifiers.

Features I/Q Bandwidth of 530MHz or Higher High IIP3: 31dBm at 450MHz, 28dBm at 900MHz High IIP2: 70dBm at 450MHz, 65dBm at 900MHz User Adjustable IIP2 to >80dBm User Adjustable DC Offset Null High Input P1dB: 13.1dBm at 900MHz Image Rejection: 45dB at 900MHz Noise Figure: 9.9dB at 450MHz 10dB at 900MHz Conversion Gain: 5.4dB at 450MHz 5.7dB at 900MHz Shutdown Mode Operating Temperature Range (TC): –40°C to 105°C 24-Lead 4mm × 4mm QFN Package Typical Application

Applications LTE/W-CDMA/TD-SCDMA Base Station Receivers Wideband DPD Receivers Point-To-Point Broadband Radios High Linearity Direct Conversion I/Q Receivers Image Rejection Receivers Packaging

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