The ISL1557 is a dual operational amplifier designed for VDSL2 and ADSL line driving in DMT based solutions. This device features a high drive capability of 750mA while consuming only 6mA of supply current per amplifier and operating from a single 4. 5V to 12V supply. The driver achieves a typical distortion of -80dBc at 150kHz into a 25Ω load. The ISL1557 is available in the thermally-enhanced 16 Ld QFN and 10 Ld HMSOP package and is specified for operation across -40°C to +85°C (IRZ, IUEZ) or -40°C to +125°C (FRZ) temperature ranges. The ISL1557 has control pins C0 and C1 for controlling the bias and enable/disable of the outputs. These controls allow for lowering the power to fit the performance/power ratio for the application. The ISL1557 is ideal for ADSL2+, SDSL, HDSL2, and VDSL line driving applications, including both 14. 5dBm and 21dBm applications.


  • Full-range industrial temperature (FRZ only): -40°C to +125°C
  • 21dBm output power capability
  • Drives up to 750mA from a +12V supply
  • 20VP-P differential output drive into 21Ω
  • -80dBc typical driver output distortion at full output at 150kHz
  • -75dBc typical driver output distortion at 4MHz
  • -71dBc typical driver output distortion at 10MHz
  • -75dBc typical driver output distortion at 17MHz
  • Low quiescent current of 6mA per amplifier
  • Supply range
    • ISL1557IRZ, ISL1557FRZ: ±2.25V to ±6V, 4.5V to 12V
    • ISL1557IUEZ: 4.5V to 12V
  • 300MHz bandwidth
  • Thermal shutdown
  • Pb-free (RoHS compliant)


  • VDSL2 line drivers
  • Power line communications line drivers
  • ADSL2+ CPE line driving
  • GSHDSL and HDSL2 line drivers

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 90
Active QFN Reel 1000
Active QFN Tube 90
Active QFN Reel 1000
Active MSOP-EP Tube 50
Active MSOP-EP Reel 1500

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL1557 Datasheet Datasheet PDF 984 KB
Application Notes & White Papers
AN1325: Choosing and Using Bypass Capacitors Application Note PDF 2.06 MB
AN1377: Half Bridge Driver Generates 100V, 10A, 4us Pulses Application Note PDF 252 KB
PCN19033 - Package Outline Correction for 10L / MSOP-EP Product Change Notice PDF 169 KB
PCN12094 - Alternate Manufacturing Site for Assembly of the Listed Intersil Packaged Products - Amkor Technology, Philippines (ATP) Product Change Notice PDF 98 KB
PCN12084 - Manufacturing Site Change for the Listed Intersil Products - Carsem (CAS) Ipoh Malaysia Product Change Notice PDF 135 KB
PCN11082 - Wafer Fabrication Site Change for Intersil ISL1557*, ISL1557A*, ISL1571* and ISL1572* Products - NXP Semiconductor Nijmegen, Netherlands Product Change Notice PDF 180 KB
PCN11059 - Shipping Tube Change for Intersil MSOP Packaged Products Product Change Notice PDF 117 KB
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB

Boards & Kits

Part Number Title Type Company
ISL1557IRZ-EVAL xDSL Differential Line Driver Evaluation Board Evaluation Renesas