AD8391ARZ Analog Devices Inc, AD8391ARZ Datasheet

AD8391ARZ

Manufacturer Part Number

AD8391ARZ

Description

IC LINE DRVR XDSL PWR DWN 8SOIC

Manufacturer

Analog Devices Inc

Type

Driverr

Datasheet

1.AD8391AR-REEL7.pdf (20 pages)

Specifications of AD8391ARZ

Number Of Drivers/receivers

2/0

Protocol

xDSL

Voltage - Supply

3 V ~ 12 V

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

For Use With

AD8391AR-EVAL - BOARD EVAL FOR AD8391

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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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 three-state maintains low

amplifier output impedance), and shutdown (Logic 0 places

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

enced to –V

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.

REV. A

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. Trademarks and

registered trademarks are the property of their respective owners.

FEATURES

Ideal xDSL Line Driver for VoDSL or Low Power

High Output Voltage and Current Drive

Low Power Operation

Low Distortion

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

High Speed

APPLICATIONS

VoDSL Modems

xDSL USB, PCI, PCMCIA Cards

Line Powered or Battery Backup xDSL Modems

Applications such as USB, PCMCIA, or PCI Based

Customer Premise Equipment (CPE)

340 mA Output Drive Current

3 V to 12 V Power Supply Range

1-Pin Logic Controlled Standby, Shutdown

Low Supply Current of 19 mA (Typical)

–82 dBc SFDR, 12 V p-p into Differential 21

4.5 nV/ Hz Input Voltage Noise Density, 100 kHz

40 MHz Bandwidth (–3 dB)

375 V/ s Slew Rate

LINE

= 100

, P

LINE

= 13.5 dBm

@ 100 kHz

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

Tel: 781/329-4700

Fax: 781/326-8703

Figure 1. Upstream Transit Spectrum with Empty Bin

at 45 kHz; Line Power = 12.5 dBm into 100

3 V to 12 V with Power-Down

PWDN

EMPTY BIN

OUT

IN1

PIN CONFIGURATION

(Thermal Coastline)

8-Lead SOIC

FREQUENCY – kHz

AD8391

137.5

xDSL Line Driver

MID

IN2

–V

AD8391

MID

OUT

www.analog.com

250

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AD8391ARZ Summary of contents

Page 1

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 ...

Page 2

AD8391–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth 0.1 dB Bandwidth Large Signal Bandwidth Slew Rate Rise and Fall Time Settling Time NOISE/HARMONIC PERFORMANCE Distortion – 178 ) G Second Harmonic Third Harmonic MTPR (In-Band) SFDR (Out-of-Band) ...

Page 3

C, V SPECIFICATIONS See TPC 1 for Basic Circuit Configuration.) Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth 0.1 dB Bandwidth Large Signal Bandwidth Slew Rate Rise and Fall Time Settling Time NOISE/HARMONIC PERFORMANCE Distortion Second Harmonic Third Harmonic Input ...

Page 4

AD8391 1 ABSOLUTE MAXIMUM RATINGS Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.6 ...

Page 5

MID 0.1 F 0.1 F 0.1 F TPC 1. Single-Ended Test Circuit 0.4 0 0pF F 0.2 0 3pF F 0 –0.1 –0.2 –0.3 –0.4 0 ...

Page 6

AD8391 –3 –6 –9 –12 –15 –18 0 FREQUENCY – MHz TPC 7. Output Voltage vs. Frequency 1500 1250 @–40 ...

Page 7

1. 100 1k 10k FREQUENCY – Hz TPC 13. Voltage Noise vs. Frequency (RTI) 10k 1k POWER-DOWN 100 10 POWER-UP 1 0.1 0.01 0.1 1 ...

Page 8

AD8391 IN+ V MID C MID IN– TPC 19. Differential Output Test Setup – – – 178 ) ...

Page 9

– – 178 ) G HD3 (F = 500kHz) O –50 –60 HD2 (F = 500kHz) O –70 –80 –90 HD2 (F = 100kHz) O –100 HD3 (F O –110 25 ...

Page 10

AD8391 GENERAL INFORMATION Theory of Operation The AD8391 is a dual current feedback amplifier with high output current capability fabricated on Analog Devices’ proprietary eXtra Fast Complementary Bipolar Process (XFCB) that enables the construction of PNP and NPN ...

Page 11

Power-Down Feature A three-state power-down function is available via the PWDN pin. It allows the user to select among three operating conditions: full on, standby, or shutdown. The –V pin is the logic reference for the S PWDN function. The ...

Page 12

AD8391 Using these calculations and a of 100 C/W for the SOIC, JA Table II shows junction temperature versus power delivered to the line for several supply voltages while operating at an ambient temperature Operation at a ...

Page 13

Receive Channel Considerations A transformer used at the output of the differential line driver to step up the differential output voltage to the line has the inverse effect on signals received from the line. A voltage reduction or attenuation equal ...

Page 14

AD8391 Generating DMT Signals At this time, DMT-modulated waveforms are not typically menu-selectable items contained within arbitrary waveform generators. Even using AWG software to generate DMT signals, AWGs that are available today may not deliver DMT signals sufficient in performance ...

Page 15

REV. A Figure 10. Evaluation Board Schematic –15– AD8391 ...

Page 16

AD8391 Figure 11. Layer 1—Primary Side Figure 12. Silkscreen—Primary Side –16– REV. A ...

Page 17

REV. A Figure 13. Layer 2—Ground Plane Figure 14. Layer 3—Power Plane –17– AD8391 ...

Page 18

AD8391 Figure 15. Layer 4—Secondary Side Figure 16. Layer 4—Silkscreen –18– REV. A ...

Page 19

Qty. Description 4 0 1206 Size Ceramic Chip Capacitor 1/8 W 1206-Size Chip Resistor 14 DNI ‘B’-Size Tantalum Chip Capacitor 4 SMA End Launch Jack (E F JOHNSON #142-0701-801) ...

Page 20

AD8391 0.25 (0.0098) 0.10 (0.0040) COPLANARITY CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN Revision History Location 10/03—Data Sheet changed from REV ...

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