7-bit 0.25 dB Wideband Digital Step Attenuator

The F1958 is part of IDT’s Glitch-Free™ family of DSAs optimized for the demanding requirements of Base Station (BTS) radio cards and numerous other applications. This device is offered in a compact 4 × 4 mm 24-VFQFPN package with 50Ω input and output impedance for ease of integration into the radio or RF system.  The F1958 offers very high reliability due to its construction from a monolithic silicon die and has very low  insertion loss with minimal distortion. Additionally, the device is designed to have extremely accurate attenuation levels. These accurate attenuation levels improve system SNR and/or ACLR by ensuring system gain is as close to the targeted level as possible. In addition, the very fast settling time in parallel mode is ideal for fast switching systems. Finally, the device uses our Glitch-Free™ technology in contrast to competing DSAs.
 

Features

  • Serial and 7-bit parallel interface 
  • 31.75dB range
  • 0.25dB steps
  • Glitch-Free™: Low Transient Overshoot
  • 500ns settling time for 0.25dB steps
  • Ultra linear > 63dBm IIP3
  • Low insertion loss < 1.7dB at 4GHz
  • Attenuation error < ±0.2dB at 4GHz
  • Bi-directional RF use
  • 3.3V or 5V supply
  • -40°C to +105°C operating temperature
  • 4 × 4 mm 24-VFQFPN package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
F1958NBGK Active NBG24P3 VFQFPN 24 K Yes Tray
Availability
F1958NBGK8 Active NBG24P3 VFQFPN 24 K Yes Reel
Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
F1958 Datasheet Datasheet PDF 5.03 MB Aug 22, 2018
Application Notes & White Papers
AN-896 RF Products EVS Digital Control Software Guide Application Note PDF 2.91 MB Aug 30, 2015
Other
Digital Step Attenuators Product Overview 日本語, 简体中文 Overview PDF 185 KB Sep 14, 2018
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB Nov 29, 2016

Software & Tools

Title Other Languages Type Format File Size Date
F1958 S-parameter Model - S-Parameter ZIP 2.83 MB May 3, 2018
RF Digital Control Software Installer Software Tool ZIP 169.81 MB Aug 30, 2015

Evaluation Boards

Part Number Title Sort ascending
F1958EVB Evaluation Board for F1958 7-bit Digital Step Attenuator