REV. SpA

AD8393

12 V ADSL-CO Line Driver

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

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© 2002 Analog Devices, Inc. All rights reserved.

FEATURES

Low 600 mW Total Power Consumption

Includes 19.8 dBm Line Power

MTPR –73 dBc, 12 V Supply

Requires Only a Single 12 V Power Supply

Can Achieve over 36 V p-p Differential Output while

Processing Signals with Occasional Peaks (Such as

Discrete Multitone)

Analog Devices’ Adaptive Linear Power Architecture

Enables High Port Density Central Office Line Cards

Current Feedback Amplifier (CFB)

Greater than 500 mA Peak Output Drive Current Capability

4 Power Modes Controlled by 2 Logic Pins

AD8393-1 Input Range of 0.75 V to 1.2 V

AD8393-2 Input Range of 0.3 V to 0.75 V

APPLICATIONS

ADSL DSLAMs, DLC

xDSL Line Cards using DMT Signals

Other Application Signals with Occasional Peaks

GENERAL DESCRIPTION

The AD8393 is a low power, high output current, single-supply,

ADSL-CO line driver that features ADI’s patent pending

Adaptive Linear Power (ALP) architecture. The AD8393 ALP

architecture offers increased port density in ADSL Central Office

(CO) line card designs through improved line driver efficiency

and simplified system design by operating from a single 12 V

supply. The AD8393 ALP amplifier can provide 20.4 dBm of

line power from a single 12 V dc supply, surpassing the efficiency

of typical class AB line drivers. ADSL signals applied to the inputs

of the AD8393 modulate internal driver supplies coincidentally

with the peak voltages contained in Discrete Multitone (DMT)

signals. The internal supplies modulated by the ALP circuit

allow the AD8393 to operate from a lower supply voltage that

improves efficiency and simplifies CO line card designs. Crest

factors (CF) up to 6.5 can be accommodated by the AD8393.

Potentially useful in non-DSL applications, the ALP architec-

ture dramatically improves power efficiency when processing

signals with occasional peaks by responding to these signal

peaks and instantaneously raising the internal supply voltage

when peak power is needed. The AD8393 is capable of delivering

over 36 V p–p of signal to a differential load, while operating

on a single 12 V supply.

To inquire about AD8393 samples and an evaluation board, contact

Analog Devices via email at: high_current_drivers.com@analog.com

–20

–30

–120

SPAN 10kHz

–70

–80

–90

–100

–40

–60

CENTER 513kHz

1kHz/DIV

–50

–110

Figure 1. AD8393-1 MTPR Performance

(DMT Waveform, 5.5 CF, Line Power = 19.8 dBm)

GND

+12V

INTERNALLY

GENERATED

PUMPED SUPPLY

INTERNALLY

GENERATED

PUMPED SUPPLY

Figure 2. Typical Output and Pumped Supplies

Processing a 5.5 CF Waveform