F1950

DESCRIPTION This document describes the specification for the F1950 Digital Step Attenuator. The F1950 is part of a family of Glitch-FreeTM DSAs optimized for the demanding requirements of communications Infrastructure. These devices are offered in a compact 4x4 QFN package with 50 Ω impedances for ease of integration into the radio system. COMPETITIVE ADVANTAGE Digital step attenuators are used in Receivers and Transmitters to provide gain control. The F1950 is a 7bit step attenuator optimized for these demanding applications. The silicon design has very low insertion loss and low distortion (+65 dBm IP3I). The device has pinpoint accuracy and settles to final attenuation value within 400 ns. Most importantly, the F1950 includes Renesas’ Glitch-FreeTM technology which results in less than 0.6 dB of overshoot ringing during MSB transitions. This is in stark contrast to competing DSAs that glitch as much as 10 dB during MSB transitions (see p.10).  Lowest insertion loss for best SNR  Glitch-FreeTM when transitioning – won’t damage PA or ADC  Extremely accurate with low distortion Glitch-FreeTTMM APPLICATIONS  Base Station 2G, 3G, 4G, TDD radiocards  Repeaters and E911 systems  Digital Pre-Distortion  Point to Point Infrastructure  Public Safety Infrastructure  WIMAX Receivers and Transmitters  Military Systems, JTRS radios  RFID handheld and portable readers  Cable Infrastructure PART# MATRIX Part# F1950 F1951 F1952 Freq range Resolution Control IL /...