31 MHz, Dual Programmable Filters and Variable Gain Amplifiers
The ADRF6516 is a matched pair of fully differential, low noise and low distortion programmable filters and variable gain amplifiers (VGAs). Each channel is capable of rejecting large out-of-band interferers while reliably boosting the desired signal, thus reducing the bandwidth and resolution requirements on the analog-to-digital converters (ADCs). The excellent matching between channels and their high spurious-free dynamic range over all gain and bandwidth settings make the ADRF6516 ideal for quadrature-based (IQ) communication systems with dense constellations, multiple carriers, and nearby interferers.
The filters provide a six-pole Butterworth response with 1 dB corner frequencies programmable through the SPI port from 1 MHz to 31 MHz in 1 MHz steps. The preamplifier that precedes the filters offers a SPI-programmable option of either 3 dB or 6 dB of gain. The preamplifier sets a differential input impedance of 1600 Ω and has a common-mode voltage that defaults to VPS/2 but can be driven from 1.1 V to 1.8 V.
The variable gain amplifiers that follow the filters provide 50 dB of continuous gain control with a slope of 15.5 mV/dB. Their maximum gains can be programmed to various values through the SPI. The output buffers provide a differential output impedance of 30 Ω and are capable of driving 2 V p-p into 1 kΩ loads. The output common-mode voltage defaults to VPS/2, but it can be adjusted down to 700 mV by driving the high impedance VOCM pin. Independent, built-in dc offset compensation loops can be disabled if fully dc-coupled operation is desired. The high-pass corner frequency is defined by external capacitors on the OFS1 and OFS2 pins and the VGA gain.
The ADRF6516 operates from a 3.15 V to 3.45 V supply and consumes a maximum supply current of 360 mA when programmed to the highest bandwidth setting. When disabled, it consumes <9 mA. The ADRF6516 is fabricated in an advanced silicon-germanium BiCMOS process and is available in a 32-lead, exposed paddle LFCSP. Performance is specified over the −40°C to +85°C temperature range.
- Baseband I/Q receivers
- Diversity receivers
- ADC drivers
- Point-to-point and point-to-multipoint radio
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The ADRF6516-EVALZ is a full featured evaluation board designed to allow the user to easily evaluate all features of the ADRF6516. The evaluation board provides a USB interface for easy filter programming, input and output SMA connections with single ended setups for both channels (due to the use of baluns). There is an option of full differential signaling on the input and output at the card edge if user desires. Access to the +3.3 V/360 mA single supply is achieved with clip leads to the VPS and COM testpoints; it has a range from +3.15 V to +3.45 V. The ADRF6516-EVALZ board is a 4 layer FR4 board. Setting the filter's cutoff frequency is achieved via the SPI port which can be programmed via the ADRF6516 USB software provided on the ADI webpage.
Product Selection Guide
RF, Microwave, and Millimeter Wave IC Selection Guide 2017
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