LT5558 Datasheet | Linear Technology

Features - Direct Conversion from Baseband to RF - High OIP3: + 22.4d Bm at 900MHz - Low Output Noise Floor at 20MHz Offset: No RF: - 158d Bm/Hz POUT = 4d Bm: - 152.7d Bm/Hz - Low Carrier Leakage: - 43.7d Bm at 900MHz - High Image Rejection: - 49d Bc at 900MHz - 3 Channel CDMA2000 ACPR: - 70.4d Bc at 900MHz - Integrated LO Buffer and LO Quadrature Phase Generator - 50Ω AC-Coupled Single-ended LO and RF Ports - High Impedance Interface to Baseband Inputs with 2.1V mon Mode Voltage - 16-Lead QFN 4mm × 4mm Package APPLICATIONS - RFID Single-Sideband Transmitters - Infrastructure TX for Cellular and ISM Bands - Image Reject Up-Converters for Cellular Bands - Low-Noise Variable Phase-Shifter for 600MHz to 1100MHz Local Oscillator Signals - Microwave Links 600MHz to 1100MHz High Linearity Direct Quadrature Modulator DESCRIPTION The LT®5558 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 GSM, EDGE, CDMA, CDMA2000, and other systems. It may also be configured as an image reject upconverting 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 doublebalanced 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 which produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 600MHz...