The ISL1557A 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 ISL1557A is designed with stronger output clamps to enhance protection against lightning transients. The ISL1557A is available in the thermally-enhanced 16 Ld QFN and 10 Ld HMSOP package and is specified for operation over the full -40°C to +85°C temperature range. The ISL1557A has two 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 ISL1557A is ideal for ADSL2+, SDSL, HDSL2, and VDSL line driving applications, including both 14. 5dBm and 21dBm applications.


  • 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
  • -82dBc typical driver output distortion at 10MHz
  • -79dBc typical driver output distortion at 17MHz
  • Low quiescent current of 6mA per amplifier
  • Supply range
  • ISL1557AIUEZ: 4.5V to 12V
  • ISL1557AIRZ: ±2.25V to ±6V, 4.5V to 12V
  • 300MHz bandwidth
  • Thermal shutdown
  • Pb-free (RoHS compliant)


  • VDSL2 line drivers
  • ADSL2+ CPE line driving
  • GSHDSL, HDSL2 line drivers

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 90
Active QFN Reel 1000

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL1557A Datasheet Datasheet PDF 921 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
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB