GENERAL DESCRIPTION

The AD8390A is a high output current, low power consumption differential amplifier. It is particularly well suited for the central office (CO) driver interface in digital subscriber line systems such as ADSL and ADSL2+. In full bias operation, the driver delivers 20.4 dBm output power into low resistance loads while compensating for hybrid and transformer insertion losses and back termination resistors.

The AD8390A is available in a thermally enhanced LFCSP package (16-lead LFCSP). Significant control and flexibility in bias current have been designed into the AD8390A.

Four power modes are selectable via two digital inputs, PD0 and PD1, providing three levels of driver bias and one power-down state. In addition, the IADJ pin is available for fine quiescent current trimming to tailor the performance of the AD8390A.

The low power consumption, high output current, high output voltage swing, and robust thermal packaging enable the AD8390A to be used as the central office line driver in ADSL, ADSL2+, and proprietary xDSL systems, as well as in other high current applications requiring a differential amplifier.

FEATURES

  Voltage feedback amplifier

     Ideal for ADSL and ADSL2+ central office (CO) and customer premises equipment (CPE) applications

     Enables high current differential applications

  Low power operation

     Single- or dual-supply operation from 10 V (± 5 V) up to 24 V (± 12 V)

     5.5 mA total quiescent supply current for full power ADSL and ADSL2+ CO applications

     Adjustable supply current to minimize power consumption

  High output voltage and current drive

     400 mA peak output drive current

     44 V p-p differential output voltage

  Low distortion

     −70 dBc MTPR, 26 kHz to 1.1 MHz

     −65 dBc MTPR, 1.1 MHz to 2.2 MHz

  High speed: 260 V/μs differential slew rate

 

APPLICATIONS

  ADSL/ADSL2+ CO and CPE line drivers

  xDSL line drivers

  High current differential amplifiers