Active Mixer suits wireless and cable applications.

Press Release Summary:




LT5522 active downconverting mixer has RF input with on-chip transformer that is 50 ohm matched over wide frequency range. RF input and Local Oscillator (LO) ports can be driven differentially or single-ended with minimum external impedance matching components. Mixer provides third-order intercept performance of 25 dBm @ 900 MHz and 21.5 dBm @ 1.9 GHz; draws 56 mA supply current at 5 V; and comes in 16-lead, 4 mm² QFN package. It operates with RF input from 600 MHz to 2.7 GHz.



Original Press Release:



High Linearity Active Mixer Enhances Dynamic Range & Reduces Costs for High Performance Wireless & Cable Applications



MILPITAS, CA - November 4, 2003 - Linear Technology Corporation introduces the LT5522, a new high performance active downconverting mixer that operates with RF input from 600MHz to 2.7GHz. The device's combination of performance, matched input characteristics, and low external component count simplifies design and reduces costs for high performance cellular base stations, cable headend equipment and fixed wireless access radios.

The LT5522 offers high third-order intercept (IP3) performance, extending system dynamic range and simplifying receiver design. Moreover, the LT5522 RF input has an on-chip transformer that is 50Ù matched over a wide frequency range. Both the RF input and the LO (Local Oscillator) ports can be driven differentially or single-ended with minimum external impedance matching components. The LO port requires low drive levels and optimum performance is achieved with an LO input power level of -5 dBm.

The LT5522 has exceptionally low port-to-port feedthrough, thus reducing filtering requirements. The LT5522 draws only 56mA of supply current at 5V, minimizing power supply requirements. The device is available in a small footprint 4mm x 4mm plastic flat package.

The LT5522 is optimized to enhance the performance of wireless infrastructure applications. Moreover, its exceptional linearity makes it an excellent building block for cable headend transmitters and receivers, high performance fixed wireless access radios and satellite receivers.

The LT5522 is offered in a 16-lead 4mm x 4mm QFN package. Pricing starts at $5.20 each in 1,000-piece quantities.

Summary of Features: LT5522

High Input IP3:

+25 dBm at 900MHz

+21.5 dBm at 1.9GHz

On-Chip RF Input Transformer

50Ù RF and LO Ports Capable of Single-Ended Operation

Low Power Consumption: 56mA at 5V

High LO-RF and LO-IF Leakage: < -49dBm from 400MHz to 2.7GHz

Very Few External Components

4mm x 4mm QFN Package

Company Background

Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.

Note: LT, AND LTC are registered trademarks of Linear Technology Corp.

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