The F1956 is part of a family of Glitch-FreeTM DSAs which offers very high reliability due to its monolithic silicon die construction in a compact 5 x 5 mm 32-pin TQFN package.  It has very low insertion loss is with minimal distortion and is designed with a 50Ω input and output impedance. Additionally the device is designed to have high accurate which improves SNR and/or ACLR by ensuring the system gain is achieved as close to targeted as possible.


  • Serial and 7-bit Parallel Interface 
  • 31.75dB Range
  • 0.25dB steps
  • Glitch-Free™: < 2dB transient ringing
  • 500ns settling time
  • Ultra linear +64dBm IP3
  • Low Insertion Loss < 1.3dB at 4GHz
  • Attenuation error < 0.6dB at 4GHz
  • 3.3V or 5V Supply
  • 1.8V or 3.3V control logic
  • -40°C to +105°C operating temperature
  • 5 x 5 mm, 32-pin TQFN package

Product Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Active VFQFPN 32 I Yes Tray
Active VFQFPN 32 I Yes Reel

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
F1956 Datasheet Datasheet PDF 6.75 MB
User Guides & Manuals
RF Product Selection Guide Guide PDF 3.64 MB
Application Notes & White Papers
AN-896 RF Products EVS Digital Control Software Guide Application Note PDF 3.17 MB
PCN# : A1402-04 Add Alternate Assembly & Test Product Change Notice PDF 45 KB
F1956 S-parameters Model - S-Parameter ZIP 5.40 MB
RF Digital Control Software Installer Software Tool ZIP 169.81 MB
Digital Step Attenuators 日本語, 简体中文 Product Brief PDF 1.07 MB

Boards & Kits

Part Number Title Type Company
F1956EVBI Evaluation Board for F1956 7-bit Digital Step Attenuator Evaluation Renesas