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RFIC tailored for wireless infrastructure equipment

Posted: 06 Jul 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Analog Devices? ADI? RFIC? ADL5519? XX?

Analog Devices Inc. (ADI) is pre-announcing availability of an RFIC that comprises a dual detector/controller.

When it debuts in quantity later this year, the 6-stage demodulating device will be able to be used to closely measure and control gain across a transmitter and receiver signal path, letting it serve in AGC circuits, power-level control circuits, and even to measure forward and reverse voltage standing wave ratio.

Slated for wireless infrastructure equipment designers, this IC will be able to simultaneously measure and monitor two input-signals with one package. Dubbed the ADL5519, the RFIC will integrate two matched detectors on a single chip. That's expected to save considerable board area, and component cost, compared to conventional or discrete power measurement approaches.

Wide frequency range
In use, the ADL5519 will cover a very wide frequency range, extending from 1MHz to 10GHz. That wide range will make the part suitable for use with all cellular standards (such as GSM, CDMA, W-CDMA and TD-SCDMA), as well as broadband wireless standards (such as IEEE-802.16, WiMAX, WiBro and IEEE-802.11 WLAN). The device will also work in proprietary systems that operate in extended frequency bands, such as UNII 5.8GHz.

Measurement and control
The ADL5519 will essentially integrate two of ADI's previously developed AD8317 log detector chips. In this integrated version, the two detectors will provide accurately-scaled and independent logarithmic outputs for both RF input channels.

The ADL5519 will also offer the benefits of the company's AD8317, with a response time of 0.8ns (fall/rise). It will also exhibit a temperature stability spec of 0.5dB (over a 50dB dynamic range).

In addition to its two matched logarithmic output voltages, the ADL5519 will provide a difference output. It can be used to effectively measure the power gain or loss between two inputs.

With the difference output, the ADL5519 will be able to control gain across a transmitter or receiver signal chain, as each of the RFIC's two individual log detectors will be able to be set to measure inputs signals at different frequencies.

Finally, this nifty RFIC will also provide an accurately-scaled temperature output signal. The temperature sensor output will be capable of driving about 1.6mA. The temperature scaling factor of the output voltage is approximately 2mV/C. The typical absolute voltage (at 25C) is about 620mV.

The ADL5519 will operate over a supply voltage range of 3-5V, with typical current demand of 56mA when enabled. Current drops to 400A when disabled. The device will be packaged in a 4-by-4mm 24-lead LFCSP.

The ADL5519 is in sampling now, with volume production scheduled for October. It will be priced at less than $5 each in 1,000-piece quantities.

- Alex Mendelsohn

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Related Datasheets
Part Number Description Category
? ADL5519 1 MHz to 10 GHz, 62 dB Dual Log Detector/Controller Actives - Sensors and Transducers



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