ISL1557 is a dual operational amplifier designed by Intersil 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 package and is specified for operation over the full -40°C to +85°C temperature range. 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.
The ISL1557 is a dual operational amplifier designed for VDSL2, ADSL2+, SDSL, HDSL2 and other XDSL line‑driving applications. It offers high drive capability (up to 750 mA) while consuming only 6 mA per amplifier and provides low distortion performance across a wide frequency range.
The device is supplied in a 16‑lead QFN package (Pb‑free) and operates over a temperature range of –40 °C to +85 °C. Supply voltage ranges from 4.5 V to 12 V (with some variants supporting 2.25 V to 6 V). Ordering information, package details, and RoHS compliance notes are included in the sheet.
| Output power | 21 dBm |
|---|---|
| Drive current | Up to 750 mA from a +12 V supply |
| Differential output drive | 20 Vp‑p into 2.5 Ω |
| Typical distortion (150 kHz) | -80 dBc |
| Typical distortion (4 MHz) | -75 dBc |
| Typical distortion (10 MHz) | -71 dBc |
| Quiescent current | 6 mA per amplifier |
| Supply voltage range | 4.5 V to 12 V |
| Bandwidth | 300 MHz |
| Operating temperature range | -40 °C to +85 °C |
| Package | 16‑lead QFN (Pb‑free) |
The ISL1557 can deliver up to 21 dBm output power.
It operates from 4.5 V to 12 V (with some versions supporting 2.25 V to 6 V).
Typical distortion is about –80 dBc at 150 kHz.
The device is offered in a 16‑lead QFN package that is Pb‑free.