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Low-power active mixer offers wide bandwidth

Posted: 11 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LT5560? downcoverting? upconverting? mixer?

Linear Technology Corp. introduced the new LT5560 low-power mixer capable of operating from 10kHz to 4GHz.

According to the company, the LT5560 can be configured either as an up- or a downconverting mixer, providing flexibility for a wide range of high performance portable or fixed wireless systems, including public-safety handheld radios, WiMAX transceiver modems, handheld RFID readers, VHF/UHF transceivers, wireless headphones, professional microphones, GSM/EDGE basestations and repeaters, satellite receivers, ISM band radios, and portable RF instrumentation.

When configured as a 900MHz downconverting mixer at 10mA, the LT5560 offers an IIP3 of 9.7dBm and a noise figure of 10.1dB. This performance is complemented by a conversion gain of 2.6dB. Moreover, the device exhibits high port-to-port RF isolation in the range of -55dBc.

The LT5560 incorporates a double-balanced mixer core design to maximize linearity and RF isolation. The local oscillator (LO) port can be driven with a single-ended, low-level input in the range of -6dBm to 1dBm. The signal input port also incorporates an input buffer, providing excellent LO-to-INPUT isolation while boosting conversion gain.

The LT5560 operates from a single supply with a wide operating voltage range. Nominal quiescent current is 10mA with all parameters specified at this current. However, the LT5560's supply current may be adjusted from 4mA to 13.5mA by a single external resistor, thus trading power dissipation for linearity performance. Moreover, the device can be shut down by an ENABLE pin. When disabled, the chip typically draws 0.1?A quiescent current to conserve power.

The LT5560 is offered in an 8-pin 3-by-3mm surface mount DFN package. Pricing starts at $1.56 each in 1,000-piece quantities. It is available immediately from stock.

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Related Datasheets
Part Number Description Category
? LT5560 0.01MHz to 4GHz Low Power Active Mixer Electromechanical - Keyboards, Relays and Switches



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