The IDT F1953 Digital-Step-Attenuator featuring Glitch-Free™ technology improves system reliability and settling time.  It has an attenuation range of 31.5 dB with excellent accuracy and very low distortion.  In addition, it features internal DC blocking capacitors to reduce the system's bill-of-materials.


  • Glitch-Free™, < 0.6 dB transient overshoot
  • Spurious Free Design
  • 2.7 to 3.3 V supply
  • Attenuation Error < 0.5 dB @ 2 GHz
  • Low Insertion Loss < 1.4 dB @ 2 GHz
  • Excellent Linearity >+63 dBm IP3I
  • Fast settling time, < 400 nsec
  • Class 2 JEDEC ESD (> 2kV HBM)
  • Serial or Parallel Interface 31.5 dB Range
  • Stable Integral Non-Linearity over temperature
  • Low Power Consumption < 200 uA
  • Integrated DC blocking capacitors
  • Drop-In replacement
  • 4x4 mm Thin VFQFPN 20 pin package


Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
F1953NCGI Active NCG20P1 VFQFPN 20 I Yes Tray
F1953NCGI8 Active NCG20P1 VFQFPN 20 I Yes Reel

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
F1953 Datasheet Datasheet PDF 1.46 MB
Application Notes & White Papers
AN-896 RF Products EVS Digital Control Software Guide Application Note PDF 2.91 MB
PCN# : A1402-04 Add Alternate Assembly & Test Product Change Notice PDF 45 KB
Digital Step Attenuators Product Overview 日本語, 简体中文 Overview PDF 185 KB
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB

Software & Tools

Title Other Languages Type Format File Size Date
RF Digital Control Software Installer Software Tool ZIP 169.81 MB

Evaluation Boards

Part Number Title Sort ascending
F1953EVBI Evaluation Board for F1953 6-bit Digital Step Attenuator