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Quadrature modulator targets IF, RF apps

Posted: 14 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:ADI? Analog Devices? radio frequency? RF? IC?

Analog Devices Inc. is expanding its portfolio of RF ICs with a quadrature modulator that operates from 50MHz to 2200MHz, making it well-suited for low intermediate frequency (IF) and RF applications such as broadband wireless access systems, microwave radio link transmitters, cable modem termination systems and cellular infrastructure.

Requiring only a single-ended, two-times local oscillator (LO) input, the company said the ADL5385 converts complex modulation information from the baseband to the final RF input, over a broad range of LO frequencies.

According to ADI, the new device provides wide output dynamic range due to its high output power capability (10dBm P1dB), high single-ended output linearity (24dBm IP3), and low noise floor (-158dBm/Hz). The -46dBm carrier feedthrough and -50dBc sideband suppression at 140MHz minimizes the need for calibration and nulling in complex high-order modulation applications such as 16 QAM and greater, the company said.

The new device accepts wideband inputs from dc to 700MHz that are compatible with the output levels of the companys AD977x family of TxDAC+ transmit DACs. The device's low LO drive requirement of -7dBm is also compatible with ADIs ADL4360 series of integrated PLL with VCO products. The 2x LO input frequency of the new device helps minimize LO pulling in applications where LO isolation and board density are critical, ADI explained.

The ADL5385 is already sampling, with full-production quantities available in September 2006. It is priced at $4.98 per unit in 1,000-piece quantities and is available in a 4-by-4mm, 24-pin lead frame chip scale package (LFCSP).

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