GENERAL DESCRIPTION

The AD8390 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+. While in full bias operation, the driver is capable of providing 24.4 dBm output power into low resistance loads. This is enough to power a 20.4 dBm line while compensating for losses due to hybrid insertion, transformer insertion, and back termination resistors.

The AD8390 fully differential amplifier is available in a thermally enhanced lead frame chip scale package (LFCSP-16) and a 16-lead QSOP/EP. Significant control and flexibility in bias current have been designed into the AD8390. The four power modes are controlled by two digital bits, PWDN (1,0) which provide three levels of driver bias and one powered-down state. In addition, the IADJ pin can be used for fine quiescent current trimming to tailor the performance of the AD8390.

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-power supply operation from 10 V (±5 V) up to 24 V (±12 V)

     4 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

     44.2 V p-p differential output voltage

  Low distortion

     –82 dBc @ 1 MHz second harmonic

     –91 dBc @ 1 MHz third harmonic

  High speed: 300 V/µs differential slew rate

APPLICATIONS

  ADSL/ADSL2+ CO and CPE line drivers

  xDSL line driver

  High current differential amplifiers