LT5518

LAST TIME BUY

1.5GHz - 2.4GHz High Linearity Direct Quadrature Modulator

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Overview

High Input Impedance Version of the LT5528
Direct Conversion to 1.5GHz - 2.4GHz
High OIP3: 22.8dBm at 2GHz
Low Output Noise Floor at 20MHz Offset:

No RF: -158.2dBm/Hz
P_OUT = 4dBm: -152.5dBm/Hz

4-Ch W-CDMA ACPR: -64dBc at 2.14GHz
Integrated LO Buffer and LO Quadrature Phase Generator
50Ω AC-Coupled Single-Ended LO and RF Ports
Low Carrier Leakage: -49dBm at 2GHz
High Image Rejection: 40dB at 2GHz
16-Lead QFN 4mm × 4mm Package

The LT5518 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 common 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.

Applications

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

Documentation

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Phase-Locked Loop (PLL) Synthesizers 1
LTC6948	LAST TIME BUY	Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO

Parts	Product Life Cycle	Description
LTC5588-1	PRODUCTION	200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3

Tools & Simulations

ADIsimRF

ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

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