LT5518 Datasheet | Linear Technology

LT5518 1.5GHz- 2.4GHz High Linearity Direct Quadrature Modulator .. Features - - - - DESCRIPTIO - - - - - - High Input Impedance Version of the LT5528 Direct Conversion to 1.5GHz - 2.4GHz High OIP3: 22.8d Bm at 2GHz Low Output Noise Floor at 20MHz Offset: No RF: - 158.2d Bm/Hz POUT = 4d Bm: - 152.5d Bm/Hz 4-Ch W-CDMA ACPR: - 64d Bc at 2.14GHz Integrated LO Buffer and LO Quadrature Phase Generator 50Ω AC-Coupled Single-Ended LO and RF Ports Low Carrier Leakage: - 49d Bm at 2GHz High Image Rejection: 40d B at 2GHz 16-Lead QFN 4mm × 4mm Package U APPLICATIO S - - - Infrastructure Tx for DCS, PCS and UMTS Bands Image Reject Up-Converters for DCS, PCS and UMTS Bands Low Noise Variable Phase-Shifter for 1.5GHz to 2.4GHz Local Oscillator Signals The LT®5518 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 high impedance 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 balanced I and Q baseband input ports are intended for DC coupling from a source with a mon mode voltage level of about 2.1V. The LO path consists of an LO buffer with single-ended input, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 1.5GHz to 2.4GHz Direct Conversion Transmitter Application...