LT5568-2 Datasheet | Linear Technology

Features - - - LT5568-2 GSM/EDGE Optimized, High Linearity Direct Quadrature Modulator DESCRIPTIO .. - - - - - - Optimized Image Rejection for 850MHz to 965MHz High OIP3: +22.9d Bm at 900MHz Low Output Noise Floor at 5MHz Offset: No RF: - 159.4d Bm/Hz POUT = 4d Bm: - 153d Bm/Hz 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 900MHz High Image Rejection: - 52d Bc at 900MHz 16-Lead 4mm × 4mm QFN Package U APPLICATIO S - - - - Infrastructure Tx for GSM/Cellular Bands Image Reject Up-Converters for Cellular Bands Low-Noise Variable Phase-Shifter for 700MHz to 1050MHz Local Oscillator Signals RFID Reader The LT®5568-2 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 that operate in the 850MHz to 965MHz band. It may 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. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 850MHz to 965MHz Direct Conversion Transmitter Application VCC...