ADRF6510 is a matched pair of fully differential low noise and low distortion programmable filters and variable gain amplifier. Each channel is capable of rejecting large out-of-band interferers while reliably boosting the wanted 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 ADRF6510 ideal for quadrature-based (IQ) communication systems with dense constellations, multiple carriers, and nearby interferers.

The filters provide a six-pole butterworth response with 0.5dB corner frequencies programmable through the SPI port from 1MHz to 30MHz in 1MHz steps. The preamplifier that precedes the filters offers a pin-programmable option of either 6dB or 12dB of gain. The preamplifier sets a differential input impedance of 400ohms and has a common-mode voltage that defaults to 2.1V but can be driven from 1.5V to 2.5V.

The variable gain amplifiers that follow the filters provide 50dB of continuous gain control with a slope of 30mV/dB. The output buffers provide a differential output impedancof 20ohms that is capable of driving 1.5Vp-p into 1kohms loads. The output common-mode voltage defaults to VPS/2, but it can be programmed via the VOCM pin. The built-in dc offset correction loop can be disabled if dc-coupled operation is desired. The high-pass corner frequency is defined by external capacitors on the OFS1 and OFS2 pins.

It operates from a 4.75V to 5.25V supply and consumes a maximum supply current of 258mA when programmed to the highest bandwidth setting. When disabled, it consumes 2mA. The ADRF6510 is fabricated in an advanced silicon-germanium Bi-CMOS process and is available in a 32-lead, exposed paddle LFCSP. Performance is specified over the -40°C to 85°C temperature range.