Analog Devices’ Radio Frequency ICs Reduce Component Count, Board Space in Broadband Communications Applications

12th September 2011
Posted By : ES Admin

Analog Devices, Inc. announced the introduction of two VGA (variable gain amplifier) products that feature new levels of integration and performance for designers of broadband communications systems. With unprecedented levels of integration, the ADRF6516 VGA incorporates dual-channel, programmable, 6-pole low-pass filters and VGAs in a single chip. Analog Devices introduced the ADL5336 VGA, which for the first time integrates two IFVGAs and a pair of programmable rms detectors.

“The ADRF6516 dual-channel, programmable low-pass filters and VGAs, and the ADL5336 VGAs with rms detectors are the latest examples of how Analog Devices’ detector, programmable filter and amplifier technologies are helping designers of next-generation radio equipment manage component count and system cost while continuously improving performance,” said Peter Real, vice president, Linear and RF products, Analog Devices. “Whether they are addressing point-to-point microwave radios, wireless base stations, communications test equipment or other applications, RF system designers can take advantage of the high level of integration and still achieve breakthrough levels of performance when compared to traditional discrete RF designs.”

ADRF6516 Dual Programmable Filters and VGA Key Features
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.
Continuous gain control range: 50 dB
Digital gain control range: 15 dB
6-pole, 1 MHz to 31 MHz programmable Butterworth low pass filter
IMD3 > –65 dBc for 1.5-Vpp composite output
HD2, HD3 > –65 dBm for 1.5-Vpp output

ADL5336 IF VGA Key Features
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 ADL5336 can operate independently or as two cascaded amplifiers, while the rms detectors can be programmed for independent gain control for each VGA. When the ADL5336 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.

3-dB bandwidth = 1 GHz
IMD3 > –62 dBc for 1 Vpp composite output at 140 MHz
Noise figure = 6.8 dB at 140 MHz
Detector output set point range: –24 dBV to –3 dBV
Single supply operation: 4.5 V to 5.5 V
Exposed paddle 5-mm × 5-mm, 32-lead LFCSP package

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