ISL1557

xDSL Differential Line Driver

OVERVIEW

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 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.

KEY FEATURES

  • 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
  • ISL1557IUEZ: 4.5V to 12V
  • ISL1557IRZ: ±2.25V to ±6V, 4.5V to 12V
  • 300MHz bandwidth
  • Thermal shutdown
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL1557
Basic Information
Production Status
Mass Production
Bandwidth (MHz)
300
# of Devices/ Channels
1
Slew Rate (V/μs)
1200
VS (min)
4.5 V
VS (max)
13.2 V
IS (per amp)
15 mA
Noise VN (nV/√Hz)
6
IBIAS
3 µA
Max Offset Voltage
7.5 mV
IOUT
1 A
VOUT (V)
10
Rail-to-Rail Input
No
Rail-to-Rail Output
No
PSRR (dB)
95
CMRR (dB)
95
Thermal Shutdown
Yes
THD (dB)
83
Gain Min
1
Enable
Yes
Qualification Level
Standard
Temperature Range
-40 to +85

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