RF ICs to reduce component count, board space in broadband communications applications

RF ICs to reduce component count, board space in broadband communications applications

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By eeNews Europe

The ADRF6516 is a highly-flexible, single-chip, matched pair of variable gain amplifiers with programmable low pass filters ideal for baseband A/D converter driver applications. The 65-dB amplifier gain-control range is split between a 15-dB digital VGA input stage and a 50-dB analog VGA output stage. Using SPI control, system designers can select the corner frequency of the 31-MHz, 6-pole Butterworth filter in 1-MHz resolution. 

The integration of the programmable filter reduces the board space and discrete components required to implement a discrete filter. The flexibility in gain setting and filter programming allows the ADRF6516 to support a receiver with a variable signal bandwidth and gain requirements. The ADRF6516 is designed to support a single 3.3-V supply and the device is packaged in a compact 32-lead, 5‑mm × 5-mm LFCSP.

The highly integrated ADL5336 is a cascadable analog dual IF VGA with two integrated rms detectors that can replace up to four discrete RF components plus additional passive discrete components. The RFIC can operate independently or as two cascaded amplifiers, while the rms detectors can be programmed for independent gain control for each VGA. When it is configured in a cascaded VGA mode, the device provides a continuous gain control range of 48 dB.  Individually, each VGA provides a gain control range of 24 dB. The maximum gain for each amplifier can be programmed via SPI control.

The setpoint for each integrated detector is also programmed via the SPI in 3-dB steps.  An additional switch has been integrated to allow the second VGA to toggle between two input sources. The ADL5336’s excellent linearity and noise figure performance allows the device to be used in applications requiring high dynamic-range such as point-to-multipoint radios and instrumentation and medical equipment.

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