6-bit serial-controlled digital step attenuators offer high accuracy in 0.5 dB steps

August 13, 2012 // By Julien Happich
RFMD's RFSA2644/2654 6-bit digital step attenuators (DSAs) feature high linearity over their entire 31.5 dB gain control range with excellent step accuracy in 0.5 dB steps.

They are programmed via a serial mode control interface that is both 3 V and 5 V compatible. They also offer a rugged Class 1C HBM ESD rating via on-chip ESD circuitry. The MCM package is footprint-compatible with most 24-pin, 4 x 4 mm QFN packages.

The RFSA2644 operates in the 50 MHz to 4000 MHz frequency range whilst the RFSA2654 is for use in the 5 MHz to 2000 MHz range, with an attenuation range of 31.5 dB in 0.5 dB steps and a step accuracy of ±0.1dB. The chips can be used in transceiver RF and IF applications including 2G, 3G, LTE, WiMax/WiFi and other wireless data terminals.