LT5572 Datasheet | Linear Technology

.. Features - - - - LT5572 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator DESCRIPTIO The LT5572 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 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 owners. - - - - - - - U APPLICATIO S - - Direct Conversion from Baseband to RF High Output: - 2.5d B Conversion Gain High OIP3: +21.6d Bm at 2GHz Low Output Noise Floor at 20MHz Offset: No RF: - 158.6d Bm/Hz POUT = 4d Bm: - 152.5d Bm/Hz Low Carrier Leakage: - 39.4d Bm at 2GHz High Image Rejection: - 41.2d Bc at 2GHz 4-Channel W-CDMA ACPR: - 67.7d Bc at 2.14GHz 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 mon Mode Voltage 16-Lead QFN 4mm × 4mm Package - 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 2.5GHz Local...