DESCRIPTION
The LT®5575 is an 800MHz to 2.7GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for communications receivers where an RF signal is directly converted into I
and Q baseband signals with bandwidth up to 490MHz. The LT5575 incorporates balanced I and Q mixers, LO
buffer amplifiers and a precision, high frequency quadrature phase shifter. The integrated on-chip broadband transform ers provide 50Ω single-ended interfaces at the RF and LO inputs. Only a few external capacitors are needed for its application in an RF receiver system.

FEATURES
■ Input Frequency Range: 0.8GHz to 2.7GHz*
■ 50Ω Single-Ended RF and LO Ports
■ High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz
■ High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz
■ Input P1dB: 13.2dBm at 900MHz
■ I/Q Gain Mismatch: 0.04dB Typical
■ I/Q Phase Mismatch: 0.4° Typical
■ Low Output DC Offsets
■ Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz
■ Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz
■ Very Few External Components
■ Shutdown Mode
■ 16-Lead QFN 4mm × 4mm Package with Exposed Pad

APPLICATIONS
■ Cellular/PCS/UMTS Infrastructure
■ RFID Reader
■ High Linearity Direct Conversion I/Q Receiver