AD8391AR(Rev0) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD8391AR
(Rev.:Rev0)

xDSL Line Driver 3 V to 12 V with Power-Down

Analog Devices 

a

FEATURES

Ideal xDSL Line Driver for VoDSL or Low Power

Applications such as USB, PCMCIA, or PCI-Based

Customer Premise Equipment (CPE)

High Output Voltage and Current Drive

340 mA Output Drive Current

Low Power Operation

3 V to 12 V Power Supply Range

1-Pin Logic Controlled Standby, Shutdown

Low Supply Current of 19 mA (Typical)

Low Distortion

–82 dBc SFDR, 12 V p-p into Differential 21 ⍀ @ 100 kHz

4.5 nV/√Hz Input Voltage Noise Density, 100 kHz

Out-of-Band SFDR = –72 dBc, 144 kHz to 500 kHz,

ZLINE = 100 ⍀, PLINE = 13.5 dBm

High Speed

40 MHz Bandwidth (–3 dB)

375 V/␮s Slew Rate

APPLICATIONS

VoDSL Modems

xDSL USB, PCI, PCMCIA Cards

Line Powered or Battery Backup xDSL Modems

xDSL Line Driver

3 V to 12 V with Power-Down

AD8391

PIN CONFIGURATION

8-Lead SOIC

(Thermal Coastline)

IN1 1

؊VS

VMID

؉VS

PWDN 2

؊؉

+VS 3

؉؊

VOUT1 4

AD8391

8 IN2

7 VMID

6 –VS

5 VOUT2

PRODUCT DESCRIPTION

The AD8391 consists of two parallel, low cost xDSL line drive

amplifiers capable of driving low distortion signals while running on

both 3 V to 12 V single-supply or equivalent dual-supply rails. It is

primarily intended for use in single-supply xDSL systems where low

power is essential, such as line powered and battery backup systems.

Each amplifier output drives more than 250 mA of current while

maintaining –82 dBc of SFDR at 100 kHz on 12 V, outstanding

performance for any xDSL CPE application.

The AD8391 provides a flexible power-down feature consisting of

a 1-pin digital control line. This allows biasing of the AD8391 to

full power (Logic “1”), Standby (Logic “tri-state” maintains low

amplifier output impedance), and Shutdown (Logic “0” places

amplifier outputs in a high impedance state). PWDN is refer-

enced to –VS.

Fabricated on ADI’s high-speed XFCB process, the high bandwidth

and fast slew rate of the AD8391 keep distortion to a minimum,

while dissipating a minimum of power. The quiescent current of the

AD8391 is low; 19 mA total static current draw. The AD8391

comes in a compact 8-lead SOIC “Thermal Coastline” package, and

operates over the temperature range –40°C to +85°C.

EMPTY BIN

25

137.5

250

FREQUENCY – kHz

Figure 1. Upstream Transit Spectrum with Empty Bin

at 45 kHz; Line Power = 12.5 dBm into 100 Ω

REV. 0

Information furnished by Analog Devices is believed to be accurate and

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

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