The ISL4089 is a complete DC-restored monolithic video amplifier sub-system. It contains a high-performance video amplifier and a nulling, sample-and-hold amplifier designed to establish a programmable DC output level. When the HOLD logic input 0 is applied, the DC restore function is active. The sample-and-hold amplifier loop is closed and used to null the DC offset of the video amplifier. This can occur during sync, or, at any time that a black level is expected. When the HOLD input 1 is applied, the correcting voltage is stored on the video amplifier's input coupling capacitor. This condition must be true during active video. The restored DC voltage level can be adjusted using an external reference voltage applied to the VREF pin. The device operates from a single +5V supply and is ideal for +5V only systems when used with a sync separator, such as the EL1883. The ISL4089 is intended to directly replace the EL4089 only in certain applications. This direct replacement requires that the single positive supply is no higher than +5.5V and that no part of the clamped output goes below ground. The NC on pin 6 is not internally connected, so it can be connected to the -5V pin in existing EL4089 applications. The ISL4089 is specified for operation over -40 °C to +85 °C temperature range.


  • Complete video level DC-restoration system
  • 0.03% differential gain and 0.05° differential phase accuracy
  • 300MHz -3dB small signal bandwidth at AV = 1
  • 150MHz -3dB small signal bandwidth at AV = 2
  • 300V/µs slew rate
  • 0.1dB flatness to 80MHz
  • +5V single supply operation
  • TTL/CMOS compatible hold signal
  • Pb-free plus anneal available (RoHS compliant)


  • Input amplifier in video equipment
  • DC-restoration amplifier in video mixers

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SOICN Tube 97
Active SOICN Reel 1000
Active SOICN Reel 250

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL4089 Datasheet Datasheet PDF 599 KB
Application Notes & White Papers
AN1695: Basics of Video: from Simple Analog to HDTV Application Note PDF 644 KB
AN1099: A Simple Circuit Removes Sync Application Note PDF 311 KB
AN9738: Video Module Interface (VMI) for ICs Application Note PDF 320 KB
AN9759: Signal Processing Blocks - A Tutorial Application Note PDF 1002 KB
AN9764: PALplus Overview Application Note PDF 250 KB
AN9644: Composite Video Separation Techniques Application Note PDF 2.79 MB
AN9741: Basic DACs for Electronic Engineers Application Note PDF 410 KB
PCN12085 - 8l, 14l, 16l SOIC w/ Gold Bond Wire @ ATP as Alternate Assembly Site Product Change Notice PDF 152 KB
PIN19028 - Q3 Cy 19 Price Increase Notice Price Increase Notice PDF 208 KB
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB
TB476:Regenerating HSYNC from Corrupted SOG or CSYNC during VSYNC Other PDF 652 KB
TB462: Simple Circuit Removes Sync Tip Other PDF 407 KB

Boards & Kits

Part Number Title Type Company
ISL4089IBZ-EVALZ DC-Restored Video Amplifier Evaluation Board Evaluation Renesas