LT5528

FEATURES ■ ■ ■ LT5528 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator DESCRIPTIO www.DataSheet4U.com ■ ■ ■ ■ ■ ■ ■ Direct Conversion to 1.5GHz to 2.4GHz High OIP3: 21.8dBm at 2GHz Low Output Noise Floor at 5MHz Offset: No RF: –159.3dBm/Hz POUT = 4dBm: –151.8dBm/Hz 4-Ch W-CDMA ACPR: –66dBc at 2.14GHz Integrated LO Buffer and LO Quadrature Phase Generator 50Ω AC-Coupled Single-Ended LO and RF Ports 50Ω DC Interface to Baseband Inputs Low Carrier Leakage: –42dBm at 2GHz High Image Rejection: 45dB at 2GHz 16-Lead QFN 4mm × 4mm Package U APPLICATIO S ■ ■ ■ Infrastructure Tx for DCS, PCS and UMTS Bands Image Reject Up-Converters for PCS and UMTS Bands Low-Noise Variable Phase-Shifter for 1.5GHz to 2.4GHz Local Oscillator Signals The LT®5528 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 PHS, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000, W-CDMA and other systems. It may also be configured as an image reject up-converting mixer, by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband inputs consist of voltage-to-current converters that in turn drive double-balanced mixers. The outputs of these mixers are summed and applied to an on-chip RF transformer, which converts the differential mixer signals to a 50Ω single-ended output. The four balanced I and Q baseband input ports are intended f...