DESCRIPTION
The LT®5571 is a direct I/Q modulator designed for high performance wireless applications, including wireless infrastructure. It allows direct modulation of an RF signal using differential baseband I and Q signals. It supports RFID, GSM, EDGE, CDMA, CDMA2000, and other systems.

FEATURES
■ Direct Conversion from Baseband to RF
■ High Output: –4.2dB Conversion Gain
■ High OIP3: 21.7dBm at 900MHz
■ Low Output Noise Floor at 20MHz Offset:
   No RF: –159dBm/Hz
   POUT = 4dBm: –153.3dBm/Hz
■ Low Carrier Leakage: –42dBm at 900MHz
■ High Image Rejection: –53dBc at 900MHz
■ 3-Ch CDMA2000 ACPR: –70.4dBc at 900MHz
■ Integrated LO Buffer and LO Quadrature Phase
   Generator
■ 50Ω AC-Coupled Single-Ended LO and RF Ports
■ High Impedance DC Interface to Baseband Inputs
   with 0.5V Common Mode Voltage
■ 16-Lead QFN 4mm × 4mm Package

APPLICATIONS
■ RFID Interrogators
■ GSM, CDMA, CDMA2000 Transmitters
■ Point-to-Point Wireless Infrastructure Tx
■ Image Reject Up-Converters for Cellular Bands
■ Low-Noise Variable Phase-Shifter for 620MHz to 1100MHz Local Oscillator Signals