Low Power, High Output Current

Differential Amplifier

Data Sheet

AD8390A

Rev. B

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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

FUNCTIONAL BLOCK DIAGRAM

56kΩ

56kΩ

56kΩ

56kΩ

VCC

VCC

VCOM

OUTP

AD8390A

OUTN

INP

INN

VEE

VEE

Figure 1.

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

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.