Low-noise Dual IF VGA with FlatNoise™

The IDT F1240 IF VGA featuring FlatNoise™ technology improves system SNR, especially at lower gain settings. By keeping both IP3O & NF flat while gain is backed off, the system SNR is improved significantly under high level interferer conditions, especially when considering alias noise in an IF sampling receiver. The fast-settling, parallel mode gain step of 0.50 dB coupled with the excellent differential non-linearity allow for SNR to be maximized further by targeting the minimum necessary gain in small, accurate increments. The matched output does not require a terminating resistor, thus the gain and distortion performance are preserved when driving Bandpass Anti-Alias filters.


  • Ideal for systems with high SNR requirements
  • 20 dB typical Maximum Gain
  • 31 dB gain control range
  • 6 bit control
  • 0.50 dB Gain Steps
  • Excellent Noise Figure ~ 4.0 dB
  • 5mm x 5mm 32 pin package
  • 200 ohm Differential Matched Input
  • 200 ohm Differential Matched Output
  • No termination resistor required
  • NF degrades < 2dB @ 10 dB reduced gain
  • 10 MHz – 500 MHz frequency range
  • Ultra-Linear: IP3O +47 dBm typical
  • Excellent 2nd Harmonic Rejection
  • Parallel / Serial Control
  • External current setting resistors
  • Very fast settling < 15 nsec
  • Individual Power Down Modes
  • Extremely low power consumption:  79 mA / Ch

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
F1240NBGI Active NBG32P2 VFQFPN 32 I Yes Tray Availability
F1240NBGI8 Active NBG32P2 VFQFPN 32 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
F1240NBGI Datasheet - Datasheet PDF 1.53 MB Mar 30, 2012
Application Notes & White Papers
AN-896 RF Products EVS Digital Control Software Guide - Application Note PDF 2.91 MB Aug 30, 2015
PCN# : TB1602-01 Alternate Test Location for Select Devices - Product Change Notice PDF 39 KB Mar 14, 2016
PCN# : A1406-01R1 Add Alternate Assembly - Product Change Notice PDF 35 KB Oct 13, 2015
PCN# : A1406-01 Alternate Assembly Locations for Selective Package - Product Change Notice PDF 33 KB Apr 5, 2015
PCN# : Q1403-01 Datasheet change F1240NBGI - Product Change Notice PDF 950 KB Apr 8, 2014

Software & Tools

Title Other Languages Type Format File Size Date
RF Digital Control Software Installer - Software Tool ZIP 169.81 MB Aug 30, 2015

Evaluation Boards

Part Number Title Sort ascending
F1240EVBI Evaluation Board for F1240 Dual Intermediate Frequency Digital Variable Gain Amplifier