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

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