LT5568 Datasheet | Linear Technology

Features - Frequency Range: 700MHz to 1050MHz - High OIP3: +22.9d Bm at 850MHz - Low Output Noise Floor at 5MHz Offset: No RF: - 160.3d Bm/Hz POUT = 4d Bm: - 154d Bm/Hz - 3-Ch CDMA2000 ACPR: - 71.4d Bc at 850MHz - 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: - 43d Bm at 850MHz - High Image Rejection: - 46d Bc at 850MHz - 16-Lead 4mm × 4mm QFN Package U APPLICATIO S - Infrastructure Tx for Cellular Bands - Image Reject Up-Converters for Cellular Bands - Low-Noise Variable Phase-Shifter for 700MHz to 1050MHz Local Oscillator Signals - RFID Reader 700MHz - 1050MHz High Linearity Direct Quadrature Modulator DESCRIPTIO The LT®5568 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, WCDMA, 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 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 for DC coupling from a source with a mon mode voltage level of about 0.5V. 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...