Designed to reduce development time, risk and solution size of RF front end circuits in modern radios, the RF205x family of products from RF Micro Devices provides engineers with a highly integrated, yet flexible solution.
These devices use a unique system partitioning, a vertical slice through an RF section, that combines a high-performance fractional-N PLL, low phase noise VCOs, LO buffers and high-linearity RF mixers. The family of products has been designed to generate a low-noise LO signal of between 300 MHz and 2400 MHz, while the built-in wideband RF mixers operate from 100 MHz up to 2500 MHz.
The family includes the RF2051 which comes with an integrated fractional-N PLL, VCOs, LO buffers and two RF mixers for time or full-duplex operation; the RF2052 single-mixer version; and the RF2053 which allows designers to take advantage of an external VCO source, while exploiting the internal mixers and PLL. All devices are contained in standard plastic 32-pin, 5 x 5 mm QFN packages and operate from a 3 V supply.
All RF205x devices use an external loop filter (passive or active utilising the on-chip operational amplifier) that can be optimised to suit varied requirements. Having a choice of a wide range of reference frequencies adds another level of flexibility to the system design. All products in the family can use a crystal of 10 MHz to 52 MHz, or alternatively can accept a reference signal of between 10 MHz and 104 MHz. In order to minimise power consumption, the chips offer programmable bias currents for the on-chip VCOs and RF mixers. RF205x products are programmed using a three-wire interface.
The devices are suitable for applications such as frequency band shifters, wireless repeaters, diversity receivers/transmitters, satellite communications equipment, point-to-point radio links, instrumentation and test equipment, cognitive radio, software-defined radio, PMR handheld and infrastructure equipment and general purpose wideband signal generation.
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